Strange Rybka 2.3.2a eval

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Topic Rybka Support & Discussion / Rybka Discussion / Strange Rybka 2.3.2a eval

By Titu

Date 2007-10-03 17:56

I saw this position in my Rybka vs Zappa Mexico match. Rybka lost the game because of poor evalution in this position (white to move):

8/2k5/2np4/P2B4/2P2p1p/4pP2/4K1PP/8 w - - 0 51

Afterwards I analysed this position with Rybka. The Rybka 2.3.2a eval showed almost +8 after 6-7 minutes. While most other top programs show almost instantly 0.0 or a negative score after few minutes.

By Hetman

Date 2007-10-03 18:18

Negative score ? What is frightening whites after Bxc6 Kxc6, g3 ? ;-)
Hetman

By Vempele (Silver)

Date 2007-10-03 18:20

fxg3 -+ :)

By Hetman

Date 2007-10-03 18:49

that is a pity, how to suggest Black to play hxg3, hxg3 and ... :-)

By Dadi Jonsson (Silver)

Date 2007-10-03 20:10

> hxg3, hxg3

Vempele had a slightly different reply in mind, which I'm sure you will find if you think about it.

By turbojuice1122 (Gold)

Date 2007-10-03 20:36

Actually, I was thinking earlier that this is an excellent position for endgame training manuals.

By Vempele (Silver)

Date 2007-10-03 20:37

Think of the rectangle rule...

By Lukas Cimiotti (Bronze)

Date 2007-10-03 20:47

Rybka 2.3.2a6 rmp (the Rybka version, that only played in the last Mexico game) gives this analysis:

New game - Rybka 2.3.2a mp, Blitz:60'+20"

Analysis by Rybka 2.3.2a6 rmp 8-way 2048-mbLukas log bench x-uci simple :

51.Bxc6 Kxc6 52.h3 d5 53.cxd5+
+- (3.89)   Depth: 10   00:00:00 337kN
51.Kd3 Nb4+ 52.Ke2 Nc6
= (0.00)   Depth: 10   00:00:00 337kN
51.Bxc6 Kxc6 52.h3 Kd7 53.Kd3
+- (5.12)   Depth: 12   00:00:01 1099kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (0.00)   Depth: 12   00:00:01 1099kN
51.Kd3 Nb4+ 52.Ke2 Nxd5 53.cxd5
= (-0.02)   Depth: 12   00:00:01 1099kN
51.Bxc6 Kxc6 52.h3 Kd7 53.Kd3
+- (5.12)   Depth: 12   00:00:02 1681kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (-0.06)   Depth: 13   00:00:02 1681kN
51.Bxc6 Kxc6 52.h3 Kd7 53.g3
+- (6.49)   Depth: 13   00:00:03 2770kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (-0.06)   Depth: 13   00:00:03 2770kN
51.Bxc6 Kxc6 52.h3 Kd7 53.g3
+- (6.49)   Depth: 13   00:00:06 5662kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (0.00)   Depth: 14   00:00:06 5662kN
51.Bxc6 Kxc6 52.h3 Kd7 53.g3
+- (7.37)   Depth: 14   00:00:09 8190kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (0.00)   Depth: 14   00:00:09 8190kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1
+- (7.93)   Depth: 15   00:00:12 10633kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (-0.09)   Depth: 15   00:00:12 10633kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1
+- (8.70)   Depth: 16   00:00:18 15960kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (-0.09)   Depth: 16   00:00:18 15960kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1
+- (8.70)   Depth: 16   00:00:24 21647kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7
= (-0.09)   Depth: 16   00:00:24 21647kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4
³ (-0.41)   Depth: 18   00:00:30 26256kN
51.a6 Kb6 52.Kf1 Nb4 53.Ba8
µ (-0.93)   Depth: 18   00:00:30 26256kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 23   00:00:36 29351kN
51.g3 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 23   00:00:36 29351kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 25   00:00:42 32863kN
51.g3 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 25   00:00:42 32863kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 25   00:00:48 36300kN
51.g3 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 25   00:00:48 36300kN
51.g3 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 26   00:00:54 39739kN
51.g3 hxg3 52.hxg3 Nd4+ 53.Kd3
= (0.00)   Depth: 26   00:00:54 39739kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3
= (-0.01)   Depth: 27   00:01:00 43295kN
51.g3 hxg3 52.hxg3 Nd4+ 53.Kd3
= (-0.01)   Depth: 27   00:01:00 43295kN

(X5355, 03.10.2007)

This analysis was made on the same computer, that played in the Mexico match.

Regards,
Lukas

By Titu

Date 2007-10-03 21:13

Thanks. Nice to see that Rybka is getting better at endgames.

By Uri Blass (*****)

Date 2007-10-04 10:03

This rybka is no good and the evaluation problem was not fixed.

From your analysis:

51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1
+- (8.70) Depth: 16 00:00:24 21647kN

You can see that rybka big scores cannot be trusted.

I think that big wrong scores are like huge holes at long time control and the blunder may be some plies earlier when rybka decide to go to that position.

They may be not important at blitz but they are clearly important at long time control and it is no bad luck that rybka failed against zappa in game 9 because of this hole.

They may not be so important in blitz but based on my experience in correspondence games rybka often have wrong huge scores that can cause her to blunder.

I do not buy the claim that giving these huge scores to rybka2.3.2a is an average improvement.
It may be an average improvement in blitz but I doubt if it is an average improvement at long time control.

Vas needs to write some code to limit the positional score unless there is a clear win.
Same type of problem is in game 9 of zappa-rybka.
You can claim that drawn position of KBPPP vs KB are rare but if rybka does not know about them they will be less rare in rybka's games.

Uri

By Titu

Date 2007-10-04 10:24

"I think that big wrong scores are like huge holes at long time control and the blunder may be some plies earlier when rybka decide to go to that position."

Exactly right. I was watching this game on my PC. All of a sudden Rybka entered this variation from a winning position (earlier). As you say, the eval of this position fooled it to enter this drawn variation. In fact, in this game Rybka even lost from this position.

By Uri Blass (*****)

Date 2007-10-04 12:16

Here is the position that demonstrates rybka's problem

Rybka gives huge score for passed pawns that can be stopped by pawns of the opponent.

h3 can be easily stopped by black promotion but rybka gives a huge score of +17.09 for white at depth 6 without seeing that Kf1 Ka5 is winning easily.

I do not understand why vasik needs to give huge score for pawns that are not more advanced than all pawns of the opponent.
A small bonus for pawns that may be unstoppable but are not more advanced than all pawns of the opponent (so you cannot be sure if they are unstoppable) may be better.

Even for real unstoppable pawns I think that it is better not to give that huge bonus(rybka even does not evaluate KQP vs KP positions as +16).

New game

8/8/k2p4/8/2P2p2/4pPpP/4K3/8 w - - 0 1

Analysis by Rybka 2.3.2a 32-bit :

5.Kf1 e2+ 6.Kxe2
+- (16.02)   Depth: 5   00:00:00
5.Kf1 e2+ 6.Kxe2 g2 7.Kf2
+- (17.09)   Depth: 6   00:00:00 2kN
5.Kf1 e2+ 6.Kxe2 g2 7.Kf2 Ka5
+- (16.28)   Depth: 7   00:00:00 4kN
5.Kf1 g2+ 6.Kxg2 Ka5 7.h4 Kb4
+- (12.73)   Depth: 8   00:00:00 10kN
5.Kf1 g2+ 6.Kxg2 Ka5 7.h4 Kb4 8.Kf1
± (1.14)   Depth: 9   00:00:00 10kN
5.Kf1 Ka5 6.h4 Kb4 7.c5 g2+ 8.Kxg2 dxc5 9.h5
³ (-0.50)   Depth: 10   00:00:00 11kN
5.Kf1 Ka5 6.h4 Kb4 7.c5 g2+ 8.Kxg2 dxc5 9.h5 c4
³ (-0.50)   Depth: 11   00:00:00 11kN
5.Kf1 Ka5 6.h4 Kb4 7.c5 g2+ 8.Kxg2 dxc5 9.h5 c4 10.h6
³ (-0.50)   Depth: 12   00:00:00 11kN
5.Kf1 Ka5 6.h4 Kb4 7.c5 dxc5 8.h5 Kc3
-+ (-3.00)   Depth: 13   00:00:00 13kN
5.Kf1 Ka5 6.h4 Kb4 7.h5 Kc3 8.c5 Kd2 9.c6 e2+ 10.Kg2
-+ (-12.48)   Depth: 13   00:00:00 29kN
5.Kf1 Ka5 6.h4 Kb4 7.h5 Kc3 8.c5 Kd2 9.cxd6 e2+ 10.Kg2 e1Q
-+ (-13.74)   Depth: 14   00:00:01 92kN

(Uri, MyTown 04.10.2007)

By Uri Blass (*****)

Date 2007-10-04 12:23

Here is another strange evaluation by rybka without tablebases.

It seems that rybka evaluates unstoppable passed pawn as better than queen and it is clearly illogical(at small depth when she does not see that the pawn has to queen to be unstoppable she has score of more than +30 when at high depth after understanding that the pawn has to queen because it cannot be unstoppable forever she reduce her evaluation to +10).

You can claim that tablebases solve it but the same type of problem can happen when you add pawns for both sides and I doubt if tablebases are going to change here(in this machine tablebases are not installed so I cannot check it)

New game

8/8/k7/8/8/7P/4K3/8 w - - 0 1

Analysis by Rybka 2.3.2a 32-bit :

1.h4 Kb5
+- (30.24)   Depth: 5   00:00:00
1.h4 Kb5 2.h5
+- (35.20)   Depth: 6   00:00:00
1.h4 Kb5 2.h5 Kc4
+- (10.94)   Depth: 7   00:00:00 1kN
1.h4 Kb5 2.h5 Kc4 3.h6
+- (11.08)   Depth: 8   00:00:00 4kN
1.h4 Kb5 2.h5 Kc4 3.h6 Kd4
+- (11.10)   Depth: 9   00:00:00 16kN
1.h4 Kb5 2.h5 Kc4 3.h6 Kd4 4.h7
+- (11.18)   Depth: 10   00:00:00 73kN

(Uri, MyTown 04.10.2007)

New game

8/ppp5/k7/8/8/7P/PPP1K3/8 w - - 0 1

Analysis by Rybka 2.3.2a 32-bit :

1.h4 Kb5
+- (31.04)   Depth: 5   00:00:00
1.h4 Kb6 2.h5
+- (32.99)   Depth: 6   00:00:00 2kN
1.h4 Kb6 2.h5 Kc6
+- (30.89)   Depth: 7   00:00:00 2kN
1.h4 Kb6 2.h5 Kc5 3.b4+
+- (29.75)   Depth: 8   00:00:00 12kN
1.h4 Kb6 2.c3 a5 3.h5 Kc5
+- (31.25)   Depth: 9   00:00:00 23kN
1.h4 Kb6 2.c3 a5 3.h5 Kc5 4.h6
+- (29.33)   Depth: 10   00:00:00 30kN
1.h4 Kb6 2.h5 Kc5 3.h6 Kd6 4.h7 Ke5 5.Kf3
+- (25.61)   Depth: 11   00:00:01 186kN
1.h4 Kb6 2.h5 Kc5 3.h6 Kd6 4.h7 Ke5 5.Ke3 Kf6
+- (13.32)   Depth: 12   00:00:07 727kN

(Uri, MyTown 04.10.2007)

By Vasik Rajlich (Silver)

Date 2007-10-06 13:03

You're right, this K+P eval stuff needs some work. No argument there.

You know what I'll say about the KPK position, though, don't you? :)

Vas

By InspectorGadget (****)

Date 2007-10-04 13:40

Maybe Vasik must rope you in to his team as one of the testers. I have noticed that you have passion for testing and revealing Rybka's flaws. Rybka 3 might come out with less "huge holes". Is it possible for you to team up with him? :)

By turbojuice1122 (Gold)

Date 2007-10-04 14:30

I definitely agree with many points put forth in this post. First, it's definitely true that the evaluation problem in these types of positions is nowhere even close to being fixed--in fact, the analysis clip given above is, in my opinion, worse than any Rybka version ever released. First, on a fast single-core processor, it will take three to four minutes for the correct move to be found. Second, the incredibly unstable evaluation fluctuation shows that there is probably some really nasty bug in the program. This also leads to the third point, that the "bad luck" will tend to occur more often because of these sorts of known problems. There were an astonishingly high number of "rare bad luck" positions in the Zappa match. Now that there are engines like Zappa Mexico that play around Rybka level, or that can play openings near or above Rybka level long enough to get into an endgame with a decent position, the incredible bulk of the potential elo improvement is going to be in endgame play. The 5-10 elo points improvement that might appear like 50 points of improvement in blitz matches against previous Rybka versions will still only be 5-10 points in longer games against other opponents; an improvement in a systematic weakness will statistically produce astronomically better results when played against an older version of the same program at blitz time controls than when played against a different program at long time controls. While I agree with the idea of doing first tests at blitz, this should only be a first step on the path to scientifically find out if the version is truly improved; if the results are very good at blitz, then it's time to go to the next step of testing at longer time controls against different programs. If there is a true improvement, a noticeably smaller number of games should be sufficient to show this. With all of the stuff going on in the endgame that will now form the incredible bulk of the elo increase when played against strong different programs such as Zappa and HIARCS, it is probably worthless to go for 5 elo point increases in the middlegame that are only noticeable at long time controls.

By dareapa (**)

Date 2007-10-04 16:02

i have to agree with u turbojuice. Maybe a new way to test engine strength should be employed by Vas...who knows....IMO I feel that Vas should lock himself in a room,by himself, and develop Rybka as he did in the past. Maybe this is not possible, but then again maybe it is....at any rate I believe that Vas can and will achieve the goals that he places in front of himself. With this post I mean no disrespect to anyone on the Rybka team. Just stating my opinion.

rgds

Dareapa

By turbojuice1122 (Gold)

Date 2007-10-04 16:25

I think he definitely needs Larry on the team. Larry has employed some fundamental changes, most of which have had very good results. He is also the person to get to the bottom of this eval problem, as it was likely his changes that solved, then recreated, the problem with the eval in this position.

By dareapa (**)

Date 2007-10-04 17:03

I think that Vas knows what he's doing as far as his team goes..much respect to all his members. Sometimes i enjoy to entertain thoughts but its meaningless in the scheme of things. I believe that it's gonna take "whatever is clever" to increase her strength where the customers and the chess world in general will be in "awe" of her.

By lkaufman (*****)

Date 2007-10-06 13:31

Just for the record, I have not yet worked on K and P endgames as such, or any other special endgames such as the two rooks and bishop vs. queen that came up in the zappa match. All terms that apply to these special endgames have not yet been "configured" for me to work on. I have done a great deal of work that applies to endgames in general, just not to specific types of endgames.

By Roland Rösler (****)

Date 2007-10-06 20:58

Larry, I can undestand your distance from this stuff. The evaluation from Rybka about RRB vs QPP (or QPPPP) is awful. You have to correct it! This is a real evaluation problem. But I would not miss this game in Mexico, because I like it most. Chess at his best. Wonderful! No human can play like this. I have not tried it, but I´m sure, Rybka never will win this game (with opposite colour) like Zappa.
My conclusion from Mexico: Chess isn´t a drawish game because of the endgame (at least). Rybka lost all her points here, because she has here the big holes. Mexiko was not chance! What we have seen was an engine that won, because the engine was really better in endgames and Rybka can´t win always in the middlegame because of the good books we nowadays have.
Last: There are (at least) two ways, you can go. Improve Rybka, that she will win her games further in the middlegame, no matter which opening is played or you improve the endgame skill of Rybka. You know, which way I would prefer. An chess engine without good endgame skill has no knowledge about chess!!

By turbojuice1122 (Gold)

Date 2007-10-06 21:45 Edited 2007-10-06 21:48

endgame (at least). Rybka lost all her points here

I believe that Rybka lost game 3 in the opening, but I agree that the other lost games and "drawn won games" were in the endgame. All in all, the way I count it, we have game 4 (-1.0), game 5 (-0.5), game 9 (-0.5), and possibly game 10 (-0.5) to give a total of 2.5 lost points in the endgame. Meanwhile, we have game 7 (+0.5) and possibly game 8 (+0.5) that were won in the endgame, giving 1.0 won points in the endgame. Thus, we have that in the 10-game match, Rybka's ineptitude compared with Zappa in the endgame was worth a total of 1.5 lost points, or 15% of the available points in the match--that's quite a lot.

By Roland Rösler (****)

Date 2007-10-06 22:33

Game 8 is a little bit puzzling for me. I believe, Rybka won, because she knows zugzwang, but I´m not totally sure. For me, it´s important in two different ways.
Case one, Rybka wins because of zugzwang. That´s great, because I always said (in this forum), engines have to understand zugzwang to understand endgames. But in this case, Rybka wins only because of this knowledge, not because of better endgame knowledge.
Case two, Rybka wins because of better evaluation or search (or time?) in this endgame. I can´t believe it. Please give me an hint! All what Í have said would be only statistic, if I´m wrong. I believe, Zappa is all times better in endgames than Rybka out of zugzwang.

By Vasik Rajlich (Silver)

Date 2007-10-07 18:23

I haven't analyzed game 8 but with so many pieces on the board you can be 100% sure that it's not a matter of zugzwang.

Re. games 4 & 9 - Rybka has special heuristics for both of these cases. The heuristics just backfired - it would have been better to have nothing. There are many Rybka endgame issues which are a matter of lack of attention, but that's not what cost us there.

Vas

By lkaufman (*****)

Date 2007-10-06 21:57

Yes, I agree that we must do more to teach Rybka more about specific types of endgames. Once these special endgames are ready for me to work on, I'll do my best to get the numbers right. The only hang-up is that the list of things Vas needs to do is a long one!

By Roland Rösler (****)

Date 2007-10-06 23:14

You have to say to Vas, that his selectivity in search may be great in middlegame but bullshit in endgame. You can´t do the rest!! Your work is very important, but you can´t do all the endgame. I´m sure, you all know it, but you have to tell it each other! Vas has to do very much in the endgame. His search must be very much wide in endgames. He believes in drawish chess, but endgames are not drawish (beside rook endgames, but this is an other lesson). If you have a look to Rybkas play, you will be aware of two issues.
First: She will never win, except the opponent like to lose. And Rybka is very fast in recognising this. This is great!
Second: Rybka only looses in endgames and will never win in endgames if they are equal. Because she has no intention.

By Banned for Life (Gold)

Date 2007-10-04 16:44

Vas mentioned that he had recently put in new heuristics for king-pawn endgames. These heuristics are not perfect, as Uri's examples clearly show, but I suspect they will be improved going forward. This is just another bump in the road.

Regards,
Alan

By Vasik Rajlich (Silver)

Date 2007-10-06 13:05

Note that the output of 2.3.2a6 is highly unconventional, there is no fluctuation in scores.

Vas

By turbojuice1122 (Gold)

Date 2007-10-06 16:52

Ahhh, I think I see--it seems that it gives evaluations for the two best moves--interesting; is this a way of getting around the problem that past versions have had of overlooking moves that would be seen in multiple variation mode?

By Vasik Rajlich (Silver)

Date 2007-10-07 18:26

Sometimes, up to three moves are analyzed. Other times, only one move is analyzed. The algorithm is still being changed quite a bit, though. It might still look quite a bit different by the time we release it.

Vas

By Gaмßito (****)

Date 2007-10-03 21:52 Edited 2007-10-03 22:04

Thanks, very nice position. I believe remember that this position was posted here some time ago. But really I am not sure, and it is possible that I can be wrong.

Of course, Rybka is having serious problems with this position. There is a terrible huge change in Rybka evaluation after some time after Bxc6 Kxc6.

This is what Rybka thinks after some minutes from the beginning of your position:

Analysis by Rybka 2.3.2a 32-bit :

1.Bxc6 Kxc6 2.h3 Kc5 3.Kd3 Kc6 4.Kc3 Kc5 5.a6
+- (2.16)   Depth: 5   00:00:00
1.Bxc6 Kxc6 2.h3 Kb7 3.g4 fxg3 4.Kxe3 Kc6 5.a6 g2 6.Kf2
+- (2.29)   Depth: 6   00:00:00 0kN
1.Bxc6 Kxc6 2.h3 Kc7 3.Kd3 Kb7 4.g4 hxg3 5.Ke2 Kc6 6.a6 g2
± (1.32)   Depth: 7   00:00:00 1kN
1.Bxc6 Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 Kc6 6.a6 g2 7.Kf2
+- (2.52)   Depth: 8   00:00:00 2kN
1.Bxc6 Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kc6 5.f4 Kc5 6.f5 g2 7.Kf2
+- (2.86)   Depth: 9   00:00:01 2kN
1.Bxc6 Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kc6 5.f4 Kc5 6.f5 Kc6 7.f6 g2 8.Kf2
+- (2.96)   Depth: 10   00:00:01 3kN
1.Bxc6 Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kc6 5.f4 Kc7 6.f5 Kd7 7.f6 g2 8.Kf2
+- (3.66)   Depth: 11   00:00:01 4kN
1.Bxc6 Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kc6 5.f4 Kc7 6.f5 Kd7 7.f6 g2 8.Kf2 Kd8 9.Kxg2 Kd7
+- (4.71)   Depth: 12   00:00:01 6kN
1.Bxc6 Kxc6 2.h3 Kb7 3.g4 fxg3 4.Kxe3 Kc7 5.f4 Kc6 6.a6 Kc7 7.f5 g2 8.Kf2 g1Q+ 9.Kxg1 Kc6 10.a7
+- (5.12)   Depth: 13   00:00:01 20kN
1.Bxc6 Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb8 7.Kxf4 Kc7 8.Kxe3 Kb7 9.f4 Kc7
+- (6.72)   Depth: 14   00:00:07 404kN
1.Bxc6 Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb8 7.Kxf4 Kc7 8.Kxe3 Kb7 9.f4 Kc7 10.a6
+- (6.93)   Depth: 15   00:00:12 685kN
1.Bxc6 Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb8 7.Kxf4 Kc7 8.Kxe3 Kd6 9.f4 Kc7 10.f5 Kd6
+- (7.07)   Depth: 16   00:00:19 1194kN
1.Bxc6 Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb8 7.Kxf4 Kc7 8.Kxe3 Kd6 9.a6 Kc7 10.f4 Kb6 11.f5 Ka7
+- (7.34)   Depth: 17   00:00:36 2312kN
1.Bxc6 Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb8 7.Kxf4 Kc7 8.Kxe3 Kd6 9.Ke4 Kc7 10.Kd5 Kb8 11.f4
+- (7.42)   Depth: 18   00:01:20 5388kN
1.Bxc6 Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb8 7.Kxf4 Kc7 8.Kxe3 Kd6 9.Ke4 Kc7 10.Kd5 c4 11.Bxc4 Kb7 12.f4
+- (8.02)   Depth: 19   00:03:00 12676kN

(, AMD 03.10.2007)

(Also Rybka is having problems with the branching factor again. After more than 30 minutes it does not reach to depth 20. It seems to be stuck into depth 19 for a long time.)

But after Bxc6 the best move is Kxc6 and not Kb8?? and Rybka is thinking this ugly move (Kb8) because it thinks that after Kxc6, white also is winning too easily. But this is not true.

Rybka thinks that after 1. Bxc6 Kxc6 and 2. h3? to go with g4 in the next move, but then Kb7! and Rybka thinks wrongly again that after Kb7 then g3?? and white can win. Although after some time it finally looks a draw for white, but it is not so easy to understand for Rybka.

Look:

Analysis by Rybka 2.3.2a 32-bit :

3.g3 fxg3 4.Kxe3 Kc7 5.f4 Kc6 6.a6 Kb6 7.a7
+- (2.73)   Depth: 5   00:00:03
3.g3 fxg3 4.Kxe3 Kc7 5.f4 Kc6 6.a6 g2 7.Kf2 Kb6 8.Kxg2
+- (4.22)   Depth: 6   00:00:03 0kN
3.g3 fxg3 4.Kxe3 Kc7 5.f4 Kd7 6.a6 g2 7.Kf2 Kc6 8.Kxg2 Kb6
+- (4.22)   Depth: 7   00:00:04 1kN
3.g3 fxg3 4.Kxe3 Kc7 5.f4 Kd7 6.a6 g2 7.Kf2 Kc7 8.f5 Kc6 9.Kxg2
+- (4.71)   Depth: 8   00:00:04 1kN
3.g3 fxg3 4.Kxe3 Kc7 5.f4 Kd7 6.a6 g2 7.Kf2 Kc7 8.f5 Kc6 9.Kxg2 Kc7
+- (4.88)   Depth: 9   00:00:04 1kN
3.g3 fxg3 4.Kxe3 Kc7 5.f4 Kd7 6.a6 g2 7.Kf2 Kc7 8.a7 g1Q+ 9.Kxg1
+- (7.38)   Depth: 10   00:00:04 22kN
3.g3 fxg3 4.Kxe3 Kc7 5.f4 g2 6.Kf2 Kc6 7.Kxg2 Kc5 8.Kf3 Kc6 9.Kg4 d5 10.cxd5+ Kxd5 11.Kxh4
+- (7.53)   Depth: 10   00:00:04 34kN
3.g3 fxg3 4.Kxe3 Kc6 5.f4 g2 6.Kf2 Kc7 7.Kxg2 Kc6 8.a6 Kc7 9.a7 Kb7 10.a8Q+ Kb6 11.Qa5+ Kc6 12.f5
+- (8.00)   Depth: 11   00:00:05 109kN
3.g3 fxg3 4.Kxe3 Kc6 5.f4 Kc5 6.a6 g2 7.Kf2 d5 8.a7 dxc4 9.a8Q Kb5 10.Qxg2 c3 11.Ke3 Kc4 12.f5
+- (10.77)   Depth: 12   00:00:11 471kN
3.g3 fxg3 4.Kxe3 Kc6 5.f4 Kd7 6.a6 g2 7.Kf2 Kc7 8.Kxg2 Kc6 9.a7 Kc7 10.f5 Kc6 11.a8Q+
+- (11.04)   Depth: 13   00:00:21 1175kN
3.g3 fxg3 4.Kxe3 Ka6 5.f4 Kxa5 6.f5 Kb6 7.f6 Kc6 8.f7 d5 9.cxd5+ Kxd5 10.Kf3 Ke6 11.f8Q Kd7 12.Qf6 Kc7 13.Qxh4
+- (10.54)   Depth: 14   00:00:46 2953kN
3.g3 fxg3 4.Kxe3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kxc4 8.f7 Kd5 9.Kf3 Kc6 10.f8Q
+- (10.38)   Depth: 15   00:01:00 3936kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qb2+ Kd3 12.Qa3+ Ke2 13.Qa2+ Qd2 14.Qb3 Ke1+ 15.Kh3 g2
-+ (-2.02)   Depth: 16   00:01:21 5243kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qb2+ Kd3 12.c5 dxc5 13.Qb5+ Kd4 14.Qd7+ Kc3 15.Qg7+ Kc2 16.Qg6+ Kd2
-+ (-2.04)   Depth: 17   00:01:21 5256kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa6+ Kc3 17.Qa3+ Kd2 18.Qxd6+ Ke2
-+ (-1.89)   Depth: 18   00:01:21 5272kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa6+ Kb3 17.Qb7+ Kc2 18.Qc6+ Kd3
-+ (-1.89)   Depth: 19   00:01:22 5292kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kd3
µ (-0.87)   Depth: 20   00:01:22 5332kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kd3
µ (-0.87)   Depth: 21   00:01:23 5373kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kd3
³ (-0.60)   Depth: 22   00:01:25 5462kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kd3
³ (-0.58)   Depth: 23   00:01:28 5567kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kd3
³ (-0.58)   Depth: 24   00:01:31 5706kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kd3
³ (-0.58)   Depth: 25   00:01:36 5906kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Kb3 17.Qb8+ Kc2 18.Qc7+ Kb1
³ (-0.37)   Depth: 26   00:01:50 6480kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qc7+ Qc5 17.Qf7+ d5 18.Kxg2 Kb4
³ (-0.29)   Depth: 27   00:02:11 7356kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa6+ Kb3 17.Qb7+ Ka2 18.Qa8+ Kb2
= (-0.19)   Depth: 28   00:02:56 9069kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa3+ Ke2 18.Qa6+ Kxf3
= (-0.05)   Depth: 29   00:04:26 12929kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa3+ Ke2 18.Qa6+ Kxf3
= (0.00)   Depth: 30   00:06:34 18147kN
3.g3 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.h6 Kc3 8.h7 Kd2 9.h8Q e2+ 10.Kg2 e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa3+ Ke2 18.Qa6+ Kxf3
= (0.00)   Depth: 31   00:08:53 23772kN

(, AMD 03.10.2007)

The right line is that after 1. Bxc6 Kxc6 2. h3 Kb7! (strong move) 3. g3 hxg3 (White has created already a passed H pawn but it is not enough to win. This of course require a very good calculation) 4. Kf1 (this move is forced because if not black wins immediately with g2) Ka6 (The black king finally goes to take the pawn on a6 and after this, it travels quickly to d2 to protect the e black pawn to promote.) 5. h4 Kxa5 6. h5 Kb4 7. h6 Kc3 8. h7 Kd2 9. h8=Q - finally the white passed pawn promote but- e2+ 10. Kg2 and e1=Q and black is already a bit better but it is not enough to win.

This is the resulting position:

7Q/8/3p4/8/2P2p2/5Pp1/3kp1K1/8 b - - 0 10

Analysis by Deep Fritz 10:

10...e1Q
µ (-0.95)   Depth: 8/41   00:00:00 468kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4
µ (-0.92)   Depth: 9/30   00:00:00 664kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4
µ (-0.92)   Depth: 10/26   00:00:01 736kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4
µ (-0.92)   Depth: 11/27   00:00:01 884kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4
µ (-0.92)   Depth: 12/30   00:00:02 1403kN
10...e1Q 11.Qd4+
³ (-0.64)   Depth: 13/50   00:00:03 2912kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa6+ Ke3 18.Qa3+ Ke2
= (0.00)   Depth: 13/50   00:00:05 5235kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa6+ Ke3 18.Qa3+ Ke2
= (0.00)   Depth: 14/40   00:00:11 10717kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa6+ Ke3 18.Qa3+ Ke2
= (0.00)   Depth: 15/41   00:00:20 20270kN
10...e1Q 11.Qd4+ Kc2 12.Qxf4 Qf2+ 13.Kh3 g2 14.Qf5+ Kc3 15.Qa5+ Kxc4 16.Qa4+ Kd3 17.Qa6+ Ke3 18.Qa3+ Ke2
= (0.00)   Depth: 16/47   00:00:45 44819kN

(, AMD 03.10.2007)

By the way, Zappa Mexico is giving a very exact line after Bxc6. Very interesting, look:

8/2k5/2Bp4/P7/2P2p1p/4pP2/4K1PP/8 b - - 0 1

Analysis by Zappa Mexico :

1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.hxg3 h3 5.g4 h2 6.Kg2 e2
µ (-1.35)   Depth: 9/38   00:00:00 56kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.hxg3 h3 5.g4 h2 6.Kg2 e2
µ (-1.35)   Depth: 9/38   00:00:00 56kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Ka7 5.f4 Ka6 6.f5 Kxa5 7.f6 Kb4 8.f7
-+ (-1.57)   Depth: 10/40   00:00:01 219kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Ka7 5.f4 Ka6 6.f5 Kxa5 7.f6 Kb4 8.f7
-+ (-1.57)   Depth: 10/40   00:00:01 219kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Ka7 5.f4 Ka6 6.f5 Kxa5 7.f6 Kb4 8.f7
-+ (-1.57)   Depth: 11/40   00:00:01 260kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Ka7 5.f4 Ka6 6.f5 Kxa5 7.f6 Kb4 8.f7
-+ (-1.57)   Depth: 11/40   00:00:01 260kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Kc6 5.f4 Kc5 6.f5 Kxc4 7.f6 Kd3 8.a6
µ (-1.01)   Depth: 12/44   00:00:02 438kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Kc6 5.f4 Kc5 6.f5 Kxc4 7.f6 Kd3 8.a6
µ (-1.01)   Depth: 12/44   00:00:02 449kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kb3 13.Qd3+ Kb4 14.Qd7 Qe2+ 15.Kg1
³ (-0.64)   Depth: 13/46   00:00:04 952kN
1...Kxc6 2.Kf1 Kb7 3.g3 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kb3 13.Qd3+ Kb4 14.Qd7 Qe2+ 15.Kg1
³ (-0.64)   Depth: 13/46   00:00:04 976kN
1...Kxc6 2.Kf1 d5 3.cxd5+ Kxd5 4.h3 Kc5 5.g3 hxg3 6.a6 Kb6 7.h4 Kxa6 8.h5 Kb7 9.h6 Kc6 10.h7
µ (-1.37)   Depth: 14/46   00:00:09 1883kN
1...Kxc6 2.Kf1 d5 3.cxd5+ Kxd5 4.h3 Kc5 5.g3 hxg3 6.a6 Kb6 7.h4 Kxa6 8.h5 Kb7 9.h6 Kc6 10.h7
µ (-1.37)   Depth: 14/46   00:00:09 1919kN
1...Kxc6 2.Kf1 d5 3.cxd5+ Kxd5 4.h3 Kc5 5.g3 hxg3 6.a6 Kb6 7.h4 Kxa6 8.h5 Kb5 9.h6 Kc4 10.h7 Kd5 11.h8Q Ke6 12.Qg8+ Kf6 13.Qd5 Kg6
µ (-1.37)   Depth: 15/50   00:00:15 3421kN
1...Kxc6 2.Kf1 d5 3.cxd5+ Kxd5 4.h3 Kc5 5.g3 hxg3 6.a6 Kb6 7.h4 Kxa6 8.h5 Kb5 9.h6 Kc4 10.h7 Kd5 11.h8Q Ke6 12.Qg8+ Kf6 13.Qd5 Kg6
µ (-1.37)   Depth: 15/50   00:00:15 3469kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Qb4
³ (-0.58)   Depth: 16/52   00:01:04 15146kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Qb4
³ (-0.58)   Depth: 16/52   00:01:05 15375kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Kxc4 14.Qc6+ Kb3 15.Qd5+ Ka3 16.Qd3+ Kb4 17.Qd4+
³ (-0.30)   Depth: 17/54   00:01:47 24260kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Kxc4 14.Qc6+ Kb3 15.Qd5+ Ka3 16.Qd3+ Kb4 17.Qd4+
³ (-0.30)   Depth: 17/54   00:01:50 24830kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Ka3 14.Qa6+ Kb2 15.Qb6+ Kc2 16.Qg6+ Kc3 17.Qf6+
= (0.00)   Depth: 18/56   00:02:47 40552kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Ka3 14.Qa6+ Kb2 15.Qb6+ Kc2 16.Qg6+ Kc3 17.Qf6+
= (0.00)   Depth: 18/56   00:02:51 41555kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Ka3 14.Qa6+ Kb2 15.Qf6+ Kb3
= (0.00)   Depth: 19/58   00:04:28 67602kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Ka3 14.Qa6+ Kb2 15.Qf6+ Kb3
= (0.00)   Depth: 19/58   00:04:38 70001kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb3 13.Qb6+ Ka3 14.Qa6+ Kb2 15.Qf6+ Kb3
= (0.00)   Depth: 20/60   00:10:28 165mN

(, AMD 03.10.2007)

And this is what Rybka thinks after Bxc6:

8/2k5/2Bp4/P7/2P2p1p/4pP2/4K1PP/8 b - - 0 1

By Gaмßito (****)

Date 2007-10-03 21:57 Edited 2007-10-03 22:07

Rybka finally sees that after Bxc6 then Kxc6 and it should draw.

8/2k5/2Bp4/P7/2P2p1p/4pP2/4K1PP/8 b - - 0 1

Analysis by Rybka 2.3.2a 32-bit :

1...Kxc6 2.h3 Kc5 3.Kd3 Kc6 4.Kc3 Kc5 5.a6
+- (2.16)   Depth: 5   00:00:00
1...Kxc6 2.h3 Kb7 3.g4 fxg3 4.Kxe3 Kc6 5.a6 g2 6.Kf2
+- (2.29)   Depth: 6   00:00:00 0kN
1...Kxc6 2.h3 Kc7 3.Kd3 Kb7 4.g4 hxg3 5.Ke2 Kc6 6.a6 g2
± (1.32)   Depth: 7   00:00:00 1kN
1...Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 Kc6 6.a6 g2 7.Kf2
+- (2.52)   Depth: 8   00:00:00 1kN
1...Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 Kc7 6.a6 Kc6 7.f5
+- (3.01)   Depth: 9   00:00:00 1kN
1...Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 Kc7 6.a6 g2 7.Kf2 Kc6 8.Kxg2 Kb6
+- (4.22)   Depth: 10   00:00:00 2kN
1...Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 Kc7 6.a6 g2 7.Kf2 g1Q+ 8.Kxg1 Kb6 9.Kf2 Kc6 10.f5
+- (4.72)   Depth: 11   00:00:00 3kN
1...Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 g2 6.Kf2 g1Q+ 7.Kxg1 Kc6 8.a6 Kb6 9.a7 Kb7 10.a8Q+
+- (4.92)   Depth: 12   00:00:01 5kN
1...Kxc6 2.h3 Kc7 3.g4 fxg3 4.Kxe3 Kb7 5.f4 g2 6.Kf2 g1Q+ 7.Kxg1 Kc6 8.a6 Kb6 9.a7
+- (7.42)   Depth: 13   00:00:01 40kN
1...Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb7 7.Kxf4 Kc7 8.Kxe3 Kb7 9.f4 Kc7
+- (6.72)   Depth: 13   00:00:03 265kN
1...Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb7 7.Kxf4 Kc7 8.Kxe3 Kb7 9.f4 Kc7 10.a6
+- (6.93)   Depth: 14   00:00:08 623kN
1...Kxc6 2.h3 Kc5 3.Kf1 Kc6 4.a6 Kb6 5.g4 fxg3 6.f4 Kc7 7.a7 e2+ 8.Kxe2
+- (5.52)   Depth: 14   00:00:10 745kN
1...Kxc6 2.h3 Kc5 3.Kf1 d5 4.cxd5 Kxd5 5.a6 e2+ 6.Kxe2 Kc6 7.Kd3 Kb6 8.Ke4 Kxa6 9.Kxf4 Kb7 10.Kg4 Kc6 11.Kxh4 Kd5 12.Kg4
+- (8.30)   Depth: 15   00:00:12 860kN
1...Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb7 7.Kxf4 Kc7 8.Kxe3 Kb7 9.Kf4 Kc7 10.Kg4 Kb7 11.Kxh4
+- (7.07)   Depth: 15   00:00:22 1546kN
1...Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb7 7.Kxf4 Kc7 8.Kxe3 Kb7 9.f4 Kc7 10.a6 Kb6 11.f5 Ka7
+- (7.34)   Depth: 16   00:00:36 2600kN
1...Kb8 2.h3 Ka7 3.Bb5 Kb7 4.Kd3 Ka7 5.c5 dxc5 6.Ke4 Kb7 7.Kxf4 Kc7 8.Kxe3 Kb7 9.f4 Kc7 10.f5 Kd6 11.a6 Kd5
+- (7.42)   Depth: 17   00:01:09 5066kN
1...Kb8 2.g4 fxg3 3.hxg3 h3 4.Kxe3 Kc8 5.f4 Kc7 6.Kf2 d5 7.cxd5 Kb8 8.f5 Kc7 9.a6 h2 10.Kg2 h1Q+ 11.Kxh1 Kb6 12.f6 Kxa6 13.f7
+- (11.58)   Depth: 18   00:06:21 27507kN
1...Kxc6 2.h3 Kb7 3.g4 hxg3 4.Kf1 Ka6 5.h4 Kxa5 6.h5 Kb4 7.c5 Kc3 8.cxd6 Kd2 9.d7 e2+ 10.Kg2 e1Q 11.d8Q+ Kc2 12.Qc7+ Kb2 13.Qb8+ Kc3 14.Qxf4 Qf2+ 15.Kh3
² (0.44)   Depth: 18   00:09:17 39730kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc1 12.Qf4+ Kb2 13.Qf6+ Kb3 14.Qb6+ Kxc4 15.Qc6+ Kb4 16.Qb7+ Kc5
= (-0.24)   Depth: 19   00:09:19 39829kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Ka4 16.Qc6+ Ka3 17.Qc5+
³ (-0.54)   Depth: 20   00:09:20 39919kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Ka4 16.Qc6+ Ka3 17.Qa8+
³ (-0.54)   Depth: 21   00:09:22 40005kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Ka4 16.Qd7+ Ka3 17.Qd3+
³ (-0.28)   Depth: 22   00:09:25 40150kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Ka4 16.Qd7+ Ka3 17.Qd3+
³ (-0.28)   Depth: 23   00:09:28 40311kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Ka4 16.Qc6+ Ka3 17.Qf3+
³ (-0.28)   Depth: 24   00:09:32 40557kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Kc3 16.Qf6+ Kc2 17.Qc6+
³ (-0.28)   Depth: 25   00:09:42 41096kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Kc3 16.Qf6+ Kc2 17.Qc6+
³ (-0.28)   Depth: 26   00:09:57 41904kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc3 12.Qf6+ Kb4 13.Qd6+ Kxc4 14.Qc6+ Kb4 15.Qd6+ Kc3 16.Qf6+ Kc2 17.Qc6+
³ (-0.28)   Depth: 27   00:10:19 43154kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kc3 13.Qf6+ Kb3 14.Qb6+ Kxc4 15.Qc6+ Kb3 16.Qd5+ Kb2 17.Qb7+
³ (-0.28)   Depth: 28   00:10:59 45233kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kc3 13.Qf6+ Kb3 14.Qb6+ Kxc4 15.Qc6+ Kb3 16.Qd5+ Kb2 17.Qb7+
³ (-0.28)   Depth: 29   00:12:09 48937kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kc3 13.Qf6+ Kb3 14.Qb6+ Kxc4 15.Qc6+ Kb3 16.Qd5+ Kb2 17.Qb7+
³ (-0.28)   Depth: 30   00:13:57 54913kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kc3 13.Qf6+ Kb3 14.Qb6+ Kxc4 15.Qc6+ Kb4 16.Qd6+ Kc4 17.Qc6+
³ (-0.28)   Depth: 31   00:17:40 67205kN
1...Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6 5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 8.f7 Kd2 9.f8Q e2+ 10.Kg2 e1Q 11.Qxd6+ Kc2 12.Qg6+ Kc3 13.Qf6+ Kb4 14.Qb2+ Kxc4 15.Qa2+ Kb4 16.Qb2+ Kc5 17.Qc2+
³ (-0.28)   Depth: 32   00:24:06 87402kN

(, AMD 03.10.2007)

Regards,
Gambito.

By turbojuice1122 (Gold)

Date 2007-10-04 04:41

The problem seems to be primarily with Rybka 2.3.2 and Rybka 2.3.2a. The other versions are not as bad, and many see the solution within seconds. The beta version is much better than 2.3.2/2.3.2a in this particular situation; also, 2.3.1 isn't all that bad, but still much worse than 2.3 and 2.3 LK. On my machine, 2.3.2 gives +10.66 after 3:12, then at 4:57, has possibly the most massive fail low I've ever seen, then finds that g4! is a draw. We should keep in mind that Larry's machine is roughly 9 times faster than my machine, so if his version of Rybka was on my machine, it would be saying that white has a huge win at times for 3 minutes. Interestingly, 2.3.2a is worse than 2.3.2 in this position in terms of time on my machine. In either case, after it finally sees that g4! draws, there is a quick accumulation of ply.

It is interesting to watch "the evolution of Rybka" in this position; I did this to see if there was a point where there is a very definite change where Rybka gets noticeably worse in this position (this occurs between 2.3.1 and 2.3.2, though also between 2.3 and 2.3.1). Early Rybkas take awhile to find the correct solution, but then Rybka 2.3 (both "normal" and "LK" versions, though LK gets it faster and at lower depth) gets it almost completely correct, seeing the forced drawing move g4! in less than 20 seconds.

Analysis by Rybka 1.0 Beta 32-bit:

51.a6
± (1.03)   Depth: 3   00:00:00
51.Bxc6
± (1.40)   Depth: 3   00:00:00
51.Bxc6
± (1.40)   Depth: 4   00:00:00
51.Bxc6 Kxc6
± (1.13)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.h3
± (0.77)   Depth: 6   00:00:00 3kN
51.Bxc6 Kxc6 52.h3 Kc7
± (0.72)   Depth: 7   00:00:00 7kN
51.a6 Nd4+ 52.Kd3 Kb6 53.Bb7
± (0.83)   Depth: 7   00:00:00 8kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3
± (0.83)   Depth: 8   00:00:00 18kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8
² (0.55)   Depth: 9   00:00:00 25kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5
² (0.49)   Depth: 10   00:00:00 42kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5 55.Ke1
² (0.31)   Depth: 11   00:00:00 71kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5 55.Kc2 Ka7
= (0.18)   Depth: 12   00:00:01 129kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.a6
± (1.26)   Depth: 12   00:00:01 169kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7
+- (1.70)   Depth: 13   00:00:01 217kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7
+- (1.95)   Depth: 14   00:00:02 280kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7
+- (2.29)   Depth: 15   00:00:02 472kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3
+- (3.23)   Depth: 16   00:00:03 613kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3
+- (3.42)   Depth: 17   00:00:03 762kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3
+- (7.46)   Depth: 18   00:00:13 5645kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5
µ (-0.87)   Depth: 19   00:00:23 7928kN
51.a6 Kb6 52.Bxc6 Kxc6 53.h3 Kb6 54.g4 fxg3 55.Kxe3 Kxa6
³ (-0.64)   Depth: 19   00:00:52 13214kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8
= (0.12)   Depth: 19   00:00:56 14461kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8
= (0.03)   Depth: 20   00:01:04 16600kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8
= (0.03)   Depth: 21   00:01:14 19442kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8
= (0.10)   Depth: 22   00:01:32 24130kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8
= (0.00)   Depth: 23   00:02:08 31649kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6
= (0.00)   Depth: 24   00:03:34 53358kN

Analysis by Rybka 1.01 Beta 7 32-bit:

51.a6
± (1.03)   Depth: 3   00:00:00
51.Bxc6
± (1.30)   Depth: 3   00:00:00
51.Bxc6
± (1.40)   Depth: 4   00:00:00
51.Bxc6 Kxc6
± (1.13)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.h3
± (0.77)   Depth: 6   00:00:00 6kN
51.Bxc6 Kxc6 52.h3 Kc7
± (0.72)   Depth: 7   00:00:00 11kN
51.a6 Nd4+ 52.Kd3 Kb6 53.Bb7
± (0.83)   Depth: 7   00:00:00 13kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3
± (0.83)   Depth: 8   00:00:00 15kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8
² (0.55)   Depth: 9   00:00:00 15kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5
² (0.49)   Depth: 10   00:00:00 20kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5 55.Ke1
² (0.31)   Depth: 11   00:00:00 35kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5 55.Kc2 Ka7
= (0.18)   Depth: 12   00:00:01 67kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.a6
± (1.26)   Depth: 12   00:00:01 78kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7
+- (1.70)   Depth: 13   00:00:01 96kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7 56.f5
+- (1.95)   Depth: 14   00:00:02 119kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7 56.f5 g2 57.Kf2
+- (2.29)   Depth: 15   00:00:02 255kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 g2+ 57.Kxg2 e2
+- (3.23)   Depth: 16   00:00:03 310kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 d5 57.cxd5 Kc7
+- (3.42)   Depth: 17   00:00:03 372kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 Kxa6 57.f5 Kb6
+- (7.46)   Depth: 18   00:00:11 2371kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
µ (-0.87)   Depth: 19   00:00:20 4266kN
51.a6 Kb6 52.Bxc6 Kxc6 53.h3 Kb6 54.g4 fxg3 55.Kxe3 Kxa6 56.f4 Kb6 57.Kf3 Kc6
³ (-0.64)   Depth: 19   00:00:49 9727kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Ka7
= (0.15)   Depth: 19   00:00:54 10730kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Ka7
= (0.18)   Depth: 20   00:01:01 12142kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Ka7
= (0.12)   Depth: 21   00:01:09 13710kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Ka7
= (0.10)   Depth: 22   00:01:25 16847kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.03)   Depth: 23   00:01:56 23195kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.03)   Depth: 24   00:03:02 36608kN

Analysis by Rybka 1.01 Beta 9 32-bit:

51.a6
± (1.03)   Depth: 3   00:00:00
51.Bxc6
± (1.30)   Depth: 3   00:00:00
51.Bxc6
± (1.40)   Depth: 4   00:00:00
51.Bxc6 Kxc6
± (1.13)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.g4
± (0.85)   Depth: 6   00:00:00 8kN
51.a6 Kb6 52.Bxc6
± (0.93)   Depth: 6   00:00:00 11kN
51.a6 Kb6 52.Bxc6 Kxc6 53.a7 Kb7
² (0.69)   Depth: 7   00:00:00 11kN
51.Bxc6 Kxc6 52.h3 Kc7
± (0.72)   Depth: 7   00:00:00 11kN
51.Bxc6 Kxc6 52.h3 Kc7 53.Ke1
² (0.54)   Depth: 8   00:00:00 14kN
51.a6 Kb6 52.Bxc6 Kxc6 53.g4 fxg3
² (0.69)   Depth: 8   00:00:00 17kN
51.a6 Kb6 52.Bxc6 Kxc6 53.g4 fxg3 54.a7 Kb7
= (0.22)   Depth: 9   00:00:00 27kN
51.Bxc6 Kxc6 52.a6 Kb6 53.g4 fxg3
² (0.45)   Depth: 9   00:00:00 33kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kd3 Kc6 54.a6
² (0.41)   Depth: 10   00:00:00 51kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kd3 Kc6 54.a6 Kb6
² (0.27)   Depth: 11   00:00:00 69kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5 55.cxd5
± (1.01)   Depth: 12   00:00:01 117kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5 55.cxd5 Kxd5 56.a6
+- (1.76)   Depth: 13   00:00:02 161kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 g2 55.Kf2 Kc6 56.Kxg2 Kb7
+- (2.23)   Depth: 14   00:00:02 220kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 g2+ 57.Kxg2
+- (2.21)   Depth: 15   00:00:03 369kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 d5 57.cxd5
+- (3.01)   Depth: 16   00:00:03 519kN
51.Bxc6 Kb8 52.h3 Kc7 53.Kf1 Kb8 54.c5 dxc5 55.a6 Ka7 56.g4 fxg3 57.f4 Kxa6
+- (6.68)   Depth: 17   00:00:10 4562kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Kc7 55.a6 Kb8 56.f4 g2+ 57.Kxg2 d5
+- (6.76)   Depth: 18   00:00:27 11126kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
µ (-0.87)   Depth: 19   00:00:29 11752kN
51.a6 Kb6 52.Bxc6 Kxc6 53.Kd3 Kb6 54.a7 Kxa7 55.Ke2 Kb7 56.Kd3 Ka6 57.Kc2 Ka5
µ (-0.82)   Depth: 19   00:00:56 16360kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Ka7
= (0.18)   Depth: 19   00:01:00 17697kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 20   00:01:04 19320kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 21   00:01:10 21357kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 22   00:01:20 24474kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 23   00:01:38 29046kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 24   00:02:07 35844kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 25   00:03:01 47270kN

Analysis by Rybka 1.01 Beta 10d 32-bit:

51.a6
± (1.03)   Depth: 3   00:00:00
51.Bxc6
± (1.30)   Depth: 3   00:00:00
51.Bxc6
± (1.40)   Depth: 4   00:00:00
51.Bxc6 Kxc6
± (1.13)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.h3
± (0.77)   Depth: 6   00:00:00 10kN
51.a6 Kb6 52.Bxc6
± (0.93)   Depth: 6   00:00:00 14kN
51.a6 Kb6 52.Bxc6 Kxc6 53.a7 Kb7
² (0.69)   Depth: 7   00:00:00 14kN
51.a6 Kb6 52.Bxc6 Kxc6 53.Kd3 Kb6
² (0.47)   Depth: 8   00:00:00 17kN
51.Bxc6 Kxc6 52.h3 Kc7 53.Ke1
² (0.54)   Depth: 8   00:00:00 19kN
51.Bxc6 Kxc6 52.h3 Kc7 53.Kd3 Kb7
² (0.48)   Depth: 9   00:00:00 28kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kd3 Kc6 54.Kc2
² (0.54)   Depth: 10   00:00:00 43kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5
± (1.03)   Depth: 11   00:00:00 69kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5 55.cxd5
± (1.01)   Depth: 12   00:00:01 98kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 Kc6 55.a6 Kc7
+- (1.42)   Depth: 13   00:00:01 148kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 g2 55.Kf2 d5 56.cxd5 Kxd5 57.Kxg2
+- (2.00)   Depth: 14   00:00:02 213kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc6 55.a6 Kb6 56.f4 d5 57.cxd5
+- (2.87)   Depth: 15   00:00:03 386kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 d5 57.cxd5
+- (3.01)   Depth: 16   00:00:03 554kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.c5 dxc5
= (0.14)   Depth: 17   00:00:04 1260kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Kf3 g2
= (0.21)   Depth: 17   00:00:10 2843kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.22)   Depth: 18   00:00:12 3385kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.c5 dxc5
² (0.39)   Depth: 18   00:00:13 3722kN
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
µ (-0.87)   Depth: 19   00:00:18 4676kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.18)   Depth: 19   00:00:21 5204kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 20   00:00:33 7063kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 21   00:01:03 11652kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.02)   Depth: 22   00:01:50 16932kN
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 23   00:03:04 24331kN

Analysis by Rybka 1.01 Beta 13b 32-bit:

51.a6
± (1.03)   Depth: 3   00:00:00
51.Bxc6
± (1.30)   Depth: 3   00:00:00
51.Bxc6
± (1.40)   Depth: 4   00:00:00
51.Bxc6 Kxc6
± (1.13)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.h3
± (0.77)   Depth: 6   00:00:00 12kN
51.Bxc6 Kxc6 52.h3 Kc7
± (0.72)   Depth: 7   00:00:00 12kN
51.a6 Nd4+ 52.Kd3 Kb6 53.Bb7
± (0.83)   Depth: 7   00:00:00 12kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3
± (0.83)   Depth: 8   00:00:00 16kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8
² (0.55)   Depth: 9   00:00:00 25kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5
² (0.49)   Depth: 10   00:00:00 40kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5 55.Ke1
² (0.31)   Depth: 11   00:00:00 69kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5
± (1.03)   Depth: 11   00:00:00 98kN, tb=1
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5 55.cxd5
± (1.01)   Depth: 12   00:00:00 119kN, tb=4
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3 56.Kxe3 Kc7
± (1.39)   Depth: 13   00:00:01 176kN, tb=26
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kc6 56.a6
+- (2.04)   Depth: 14   00:00:01 251kN, tb=92
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.g4 fxg3 55.a6 Kb6 56.f4 d5
+- (2.68)   Depth: 15   00:00:04 439kN, tb=231
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.g4 fxg3 55.a6 Kb6 56.f4 d5 57.cxd5 e2+
+- (3.01)   Depth: 16   00:00:05 530kN, tb=383
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.c5 dxc5
= (0.14)   Depth: 17   00:00:15 1225kN, tb=1614
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.c5 dxc5
² (0.39)   Depth: 18   00:00:40 3333kN, tb=3913
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
µ (-0.87)   Depth: 19   00:00:53 4201kN, tb=5311
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Kf1 Nxd5
= (0.00)   Depth: 19   00:01:37 7828kN, tb=9333
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Kf1 Nxd5
= (0.00)   Depth: 20   00:01:59 9177kN, tb=11004
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Kf1 Nxd5
= (0.00)   Depth: 21   00:02:34 11240kN, tb=13914
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Kf1 Nxd5
= (0.00)   Depth: 22   00:03:35 14756kN, tb=18504

Analysis by Rybka 1.1 32-bit:

51.Bxc6
± (1.27)   Depth: 2   00:00:00
51.Bxc6
+- (1.51)   Depth: 3   00:00:00
51.Bxc6 Kxc6
± (0.85)   Depth: 4   00:00:00
51.Bxc6 Kxc6 52.h3
± (0.82)   Depth: 5   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (1.09)   Depth: 5   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2 Kb6
± (0.90)   Depth: 6   00:00:00 3kN
51.a6 Nd4+ 52.Kd3 e2 53.Kd2 Kb6 54.Bb7
± (1.11)   Depth: 7   00:00:00 5kN
51.a6 Nd4+ 52.Kd3 e2 53.Kd2 Kb6 54.Bb7 Ka7
± (0.88)   Depth: 8   00:00:00 8kN
51.a6 Nd4+ 52.Ke1 Kb6 53.Bb7 Ka7 54.Kd1 Kb6
² (0.44)   Depth: 9   00:00:00 30kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Ke1 Kc6 54.Kd1
² (0.62)   Depth: 9   00:00:00 37kN, tb=1
51.Bxc6 Kxc6 52.h3 Kc5 53.Ke1 Kc6 54.Kd1 Kb7
² (0.34)   Depth: 10   00:00:00 48kN, tb=2
51.a6 Nd4+ 52.Ke1 Kb6 53.Bb7 Nb3 54.Bc8 Nc5 55.a7
² (0.40)   Depth: 10   00:00:00 56kN, tb=2
51.a6 Nd4+ 52.Kd3 Kb6 53.Bb7 Nb3 54.Bc8 Nc5+ 55.Kc2 Nxa6 56.Bxa6 Kxa6 57.Kd1 Kb6
= (0.03)   Depth: 11   00:00:00 83kN, tb=2
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3 56.Kxe3
± (1.16)   Depth: 11   00:00:00 97kN, tb=5
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3 56.Kxe3 Kc7
+- (1.44)   Depth: 12   00:00:01 116kN, tb=21
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3 56.Kxe3 Kc7 57.f4
± (1.40)   Depth: 13   00:00:01 141kN, tb=56
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kb8 56.f5 g2 57.Kf2
+- (2.36)   Depth: 14   00:00:02 211kN, tb=174
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 g2 55.Kf2 Ka6 56.f4 d5 57.cxd5 Kb5
+- (3.21)   Depth: 15   00:00:02 256kN, tb=241
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 g2 55.Kf2 Ka6 56.f4 d5 57.cxd5 Kb5
+- (3.49)   Depth: 16   00:00:09 557kN, tb=832
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 g2+ 55.Kxg2 d5 56.cxd5 Kc7 57.f4 Kd7
+- (3.54)   Depth: 17   00:00:24 1039kN, tb=3528
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.c5 dxc5
= (0.12)   Depth: 18   00:00:27 1252kN, tb=4245
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.c5 dxc5
= (0.12)   Depth: 19   00:00:39 2058kN, tb=5685
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
³ (-0.33)   Depth: 20   00:01:03 3450kN, tb=8343
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke3 Nxd5+
= (0.00)   Depth: 20   00:02:44 8387kN, tb=18294
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke3 Nxd5+
= (0.00)   Depth: 21   00:03:08 9970kN, tb=20609
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke3 Nxd5+
= (0.00)   Depth: 22   00:03:43 12325kN, tb=24474
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke3 Nxd5+
= (0.00)   Depth: 23   00:04:51 16719kN, tb=31655
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke3 Nxd5+
= (0.00)   Depth: 24   00:06:38 22997kN, tb=43423

Analysis by Rybka 1.2f 32-bit:

51.Bxc6
± (1.31)   Depth: 2   00:00:00
51.a6
± (0.88)   Depth: 4   00:00:00
51.a6
± (0.88)   Depth: 4   00:00:00
51.a6 Nd4+ 52.Kd3
± (1.01)   Depth: 4   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.97)   Depth: 5   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2 Kb6
± (0.80)   Depth: 6   00:00:00 3kN
51.a6 Nd4+ 52.Kd3 e2 53.Kd2 Kb6 54.Bb7
± (0.98)   Depth: 7   00:00:00 7kN
51.a6 Nd4+ 52.Ke1 Kb6 53.Bb7 Nb3 54.Kd1
² (0.38)   Depth: 8   00:00:00 23kN
51.a6 Nd4+ 52.Ke1 Kb6 53.Bb7 Nb3 54.Ke2 Nc5
= (0.25)   Depth: 9   00:00:00 44kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Ke1 Kc6 54.Kd1 Kb7
± (0.76)   Depth: 9   00:00:00 51kN, tb=1
51.Bxc6 Kxc6 52.h3 Kc5 53.Ke1 Kc6 54.Kd1 Kb7 55.Ke2 Kc7 56.g3 fxg3 57.Kxe3 Kb7
± (0.75)   Depth: 10   00:00:00 61kN, tb=2
51.Bxc6 Kxc6 52.h3 Kc5 53.g3 fxg3 54.Kxe3 d5 55.cxd5 Kxd5 56.a6
± (1.33)   Depth: 11   00:00:00 89kN, tb=16
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kd7 56.f5
+- (1.63)   Depth: 12   00:00:00 121kN, tb=40
51.Bxc6 Kxc6 52.h3 Kc7 53.g3 hxg3 54.Kf1 e2+ 55.Kxe2 Kd8 56.h4 g2 57.Kf2 d5
+- (2.61)   Depth: 13   00:00:01 179kN, tb=83
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kc7 55.g3 fxg3 56.f4 g2+ 57.Kxg2 d5
+- (2.79)   Depth: 14   00:00:02 365kN, tb=234
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 d5 54.cxd5 e2+ 55.Kxe2 Kxd5 56.Kd3 Kc5 57.Ke4 Kc6
+- (3.48)   Depth: 15   00:00:04 498kN, tb=374
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 d5 54.cxd5 e2+ 55.Kxe2 Kxd5 56.Kd3 Kc5 57.Ke4 Kc6
+- (3.48)   Depth: 16   00:00:06 697kN, tb=616
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 hxg3 54.Kf1 Ka6 55.h4 Kxa5 56.h5 Kb4 57.h6 Kc3
³ (-0.40)   Depth: 17   00:00:18 1313kN, tb=2786
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 17   00:02:06 7748kN, tb=20831
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 18   00:02:19 9790kN, tb=22995
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 19   00:02:47 12555kN, tb=27994
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 20   00:03:32 17246kN, tb=37383
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 21   00:04:46 24512kN, tb=53881
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 22   00:06:45 35733kN, tb=81245
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 23   00:10:46 53262kN, tb=124372
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 24   00:16:02 76891kN, tb=186619
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+ 57.Ke1 Nxd5
= (0.00)   Depth: 25   00:25:33 114mN, tb=292129

Analysis by Rybka 2.1o 32-bit:

51.Bxc6
± (1.31)   Depth: 2   00:00:00
51.Bxc6
± (0.77)   Depth: 3   00:00:00
51.a6
± (0.88)   Depth: 3   00:00:00
51.a6
± (1.01)   Depth: 4   00:00:00
51.a6 Nd4+ 52.Kd3
± (0.97)   Depth: 5   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.80)   Depth: 6   00:00:00 1kN
51.a6 Nd4+ 52.Kd3 e2 53.Kd2 Kb6
± (0.98)   Depth: 7   00:00:00 2kN
51.a6 Nd4+ 52.Ke1 Kb6 53.Bb7 Nb3
² (0.38)   Depth: 8   00:00:00 8kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 hxg3
² (0.66)   Depth: 8   00:00:00 10kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3
² (0.69)   Depth: 9   00:00:00 13kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5
² (0.68)   Depth: 10   00:00:00 15kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3 d5 55.cxd5
± (1.04)   Depth: 11   00:00:00 20kN
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.Kf1 Kb6 56.g4 fxg3
+- (1.57)   Depth: 12   00:00:01 28kN, tb=2
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.Kf1 Kb6 56.g4 fxg3 57.f4
+- (1.72)   Depth: 13   00:00:01 37kN, tb=6
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Ka7 55.f4 Kb8 56.f5 g2 57.Kf2
+- (2.59)   Depth: 14   00:00:02 58kN, tb=14
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 e2+ 57.Kxe2 d5
+- (3.46)   Depth: 15   00:00:04 151kN, tb=29
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6 Kb6 55.g4 fxg3 56.f4 g2+ 57.Kxg2 d5
+- (5.31)   Depth: 16   00:00:10 293kN, tb=79
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
= (-0.09)   Depth: 17   00:00:20 432kN, tb=213
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.f5 Nxf5
= (0.00)   Depth: 17   00:01:45 1854kN, tb=1244
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.f5 Nxf5
= (0.00)   Depth: 18   00:01:58 2350kN, tb=1369
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.f5 Nxf5
= (0.00)   Depth: 19   00:02:25 3117kN, tb=1689
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.f5 Nxf5
= (0.00)   Depth: 20   00:03:03 3941kN, tb=2249
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.f5 Nxf5
= (0.00)   Depth: 21   00:04:06 5429kN, tb=3227
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.f5 Nxf5
= (0.00)   Depth: 22   00:05:50 7738kN, tb=4952

Analysis by Rybka 2.2 32-bit:

51.Bxc6
± (0.75)   Depth: 2   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.80)   Depth: 7   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.80)   Depth: 7   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.80)   Depth: 7   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.80)   Depth: 7   00:00:00
51.a6 Nd4+ 52.Kd3 e2 53.Kd2
± (0.80)   Depth: 7   00:00:00 2kN
51.a6 Nd4+ 52.Kd3 Nc6 53.g4
± (0.78)   Depth: 7   00:00:00 4kN
51.a6 Nd4+ 52.Kd3 Nc6 53.g4 hxg3
± (0.75)   Depth: 8   00:00:00 9kN
51.a6 Nd4+ 52.Kd1 Kb6 53.Bb7 Nb3 54.Bc8
² (0.26)   Depth: 9   00:00:01 18kN
51.Bxc6 Kxc6 52.h3 Kc5 53.g4 fxg3 54.Kxe3
² (0.69)   Depth: 9   00:00:01 21kN
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3
± (1.33)   Depth: 10   00:00:01 23kN
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3 56.Kxe3
+- (1.72)   Depth: 11   00:00:01 30kN
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.g4 fxg3 56.Kxe3 Kb6
+- (1.72)   Depth: 12   00:00:01 35kN, tb=2
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc6 55.a6 g2 56.Kf2 Kb6
+- (2.85)   Depth: 13   00:00:02 50kN, tb=10
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc6 55.a6 g2 56.Kf2 Kb6 57.f4
+- (2.85)   Depth: 14   00:00:03 63kN, tb=15
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Kc6 55.a6 Kc7 56.f4 Kb6 57.f5
+- (2.69)   Depth: 15   00:00:12 157kN, tb=125
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Kc6 55.a6 Kc7 56.f4 d5 57.cxd5 Kb6
+- (3.64)   Depth: 16   00:00:15 221kN, tb=156
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
= (-0.09)   Depth: 17   00:00:20 330kN, tb=210
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.02)   Depth: 17   00:01:50 1455kN, tb=1311
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.f5 Nf4 57.Be4 d5
= (0.00)   Depth: 18   00:02:08 1990kN, tb=1480
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.f5 Nf4 57.Be4 d5
= (0.00)   Depth: 19   00:02:38 2636kN, tb=1871
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.f5 Nf4 57.Be4 d5
= (0.00)   Depth: 20   00:03:32 3593kN, tb=2647
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.f5 Nf4 57.Be4 d5
= (0.00)   Depth: 21   00:04:52 5006kN, tb=3905

Analysis by Rybka 2.3 32-bit :

51.Bxc6
+- (1.51)   Depth: 2   00:00:00
51.Bxc6
± (1.13)   Depth: 3   00:00:00
51.Bxc6
± (1.24)   Depth: 4   00:00:00
51.Bxc6 Kxc6 52.Kd3
± (1.32)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.Kd3 Kc5
+- (1.42)   Depth: 6   00:00:00 1kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.a6
± (1.28)   Depth: 7   00:00:00 1kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.a6
± (1.26)   Depth: 8   00:00:00 2kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.Kc3 Kc6 54.Kc2
± (1.21)   Depth: 9   00:00:00 4kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.Kc3 Kc6 54.Kc2 d5
± (1.25)   Depth: 10   00:00:00 6kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.Kc3 Kc6 54.Kc2 Kb7 55.h3
± (1.21)   Depth: 11   00:00:00 10kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.Kc3 Kc6 54.Kc2 Kb7 55.h3 Kc6
± (1.26)   Depth: 12   00:00:00 13kN
51.Bxc6 Kxc6 52.a6
+- (2.24)   Depth: 13   00:00:00 26kN
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.g4 fxg3 55.a6 e2+ 56.Kxe2 g2
+- (3.30)   Depth: 14   00:00:01 50kN, tb=1
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 d5 54.a6
+- (3.23)   Depth: 15   00:00:01 58kN, tb=1
51.Bxc6 Kxc6 52.h3 Kb7 53.Kf1 Ka6 54.g4 hxg3 55.h4 Kxa5 56.c5 dxc5
± (0.73)   Depth: 16   00:00:02 170kN, tb=6
51.Bxc6 Kxc6 52.Kd3 Kb7 53.c5 dxc5 54.Kc2 Kc6 55.Kc1 c4
= (0.25)   Depth: 16   00:00:04 245kN, tb=10
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
³ (-0.64)   Depth: 17   00:00:07 385kN, tb=22
51.a6 Nd4+ 52.Kd3 Kb6 53.Bb7 Nb3 54.Bc8 Nc1+ 55.Kc2 Nb3 56.Kd1 Nd2 57.Ke2 Nxc4
= (0.00)   Depth: 17   00:00:08 482kN, tb=22
51.a6 Kb6 52.a7 Nd4+ 53.Kd3 Kxa7 54.Be4 Kb6 55.Ba8 Kc5 56.Bd5 Nb3 57.Bf7 Nc1+
³ (-0.47)   Depth: 18   00:00:19 1324kN, tb=54
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.05)   Depth: 18   00:00:19 1360kN, tb=56
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 19   00:00:20 1436kN, tb=59
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 20   00:00:23 1630kN, tb=62
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 21   00:00:27 1886kN, tb=84
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 22   00:00:35 2316kN, tb=142
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 23   00:00:44 2930kN, tb=181
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 24   00:01:03 3974kN, tb=311
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 25   00:01:23 5143kN, tb=433
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 26   00:01:58 6931kN, tb=689
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 27   00:02:41 9282kN, tb=1021
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 28   00:03:44 12877kN, tb=1553

Analysis by Rybka 2.3 LK 32-bit :

51.Bxc6
+- (1.64)   Depth: 2   00:00:00
51.Bxc6
± (1.24)   Depth: 3   00:00:00
51.Bxc6
± (1.38)   Depth: 4   00:00:00
51.Bxc6 Kxc6 52.Kd3
+- (1.44)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.Kd3 Kc5
+- (1.54)   Depth: 6   00:00:00 1kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+
± (1.15)   Depth: 7   00:00:00 1kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+
± (1.01)   Depth: 8   00:00:00 2kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+
± (0.89)   Depth: 9   00:00:00 5kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+
± (0.95)   Depth: 10   00:00:00 8kN
51.Bxc6 Kxc6 52.Kd1 d5 53.a6 dxc4 54.a7 Kb7 55.Kc2 e2
± (0.95)   Depth: 11   00:00:00 14kN
51.Bxc6 Kxc6 52.Ke1 d5 53.cxd5+
± (0.97)   Depth: 12   00:00:00 24kN, tb=2
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6
+- (2.45)   Depth: 13   00:00:01 33kN, tb=3
51.Bxc6 Kxc6 52.h3 Kc5 53.Kf1 Kc6 54.a6
+- (3.62)   Depth: 14   00:00:01 40kN, tb=4
51.Bxc6 Kxc6 52.h3 Kb7 53.g3 hxg3 54.Kf1 Ka6 55.h4 Kxa5 56.h5 Kb4
± (1.12)   Depth: 15   00:00:03 109kN, tb=21
51.Bxc6 Kxc6 52.Ke1 d5 53.cxd5+
± (0.99)   Depth: 15   00:00:03 155kN, tb=23
51.Bxc6 Kxc6 52.Ke1 d5 53.cxd5+
± (1.00)   Depth: 16   00:00:04 181kN, tb=29
51.Bxc6 Kxc6 52.Ke1 d5 53.cxd5+
= (0.00)   Depth: 17   00:00:06 263kN, tb=50
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.19)   Depth: 17   00:00:13 484kN, tb=93
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.09)   Depth: 18   00:00:14 563kN, tb=94
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.04)   Depth: 19   00:00:18 929kN, tb=107
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 20   00:00:21 1248kN, tb=116
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 21   00:00:27 1800kN, tb=137
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 22   00:00:38 2302kN, tb=248
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 23   00:00:46 2829kN, tb=291
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 24   00:01:01 3680kN, tb=379
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2
= (0.00)   Depth: 25   00:01:28 5197kN, tb=564

Analysis by Rybka 2.3.1 32-bit :

51.Bxc6
+- (1.61)   Depth: 2   00:00:00
51.Bxc6
± (1.22)   Depth: 3   00:00:00
51.Bxc6
± (1.35)   Depth: 4   00:00:00
51.Bxc6 Kxc6 52.Kd3
± (1.29)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.Kd3 Kc5
+- (1.51)   Depth: 6   00:00:00 1kN
51.Bxc6 Kxc6 52.Kd3 Kc5 53.h3
± (1.01)   Depth: 7   00:00:00 1kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+ Kxd5 54.a6 Kc6
± (1.20)   Depth: 8   00:00:00 2kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.a7 Kb7
± (1.05)   Depth: 9   00:00:00 4kN
51.Bxc6 Kxc6 52.Kd3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.a7 Kb7 56.Kc3
± (1.07)   Depth: 10   00:00:00 6kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc6 55.a6
+- (2.30)   Depth: 11   00:00:00 9kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc6 55.a6 g2 56.Kf2
+- (2.40)   Depth: 12   00:00:00 10kN
51.Bxc6 Kxc6 52.h3 d5 53.cxd5+ Kxd5 54.a6 Kc6 55.Kd3 Kb6 56.Kc3 e2 57.Kd2 e1Q+
+- (1.84)   Depth: 13   00:00:01 18kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 g2 55.Kf2 d5 56.cxd5 Kb7 57.Kxg2 Kc7
+- (3.62)   Depth: 14   00:00:01 57kN, tb=1
51.Bxc6 Kxc6 52.Kf1 Kc7 53.h3 Kb7 54.g4 fxg3 55.f4 g2+ 56.Kxg2 d5 57.cxd5 e2
+- (4.09)   Depth: 15   00:00:03 189kN, tb=11
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
+- (1.59)   Depth: 16   00:00:07 442kN, tb=39
51.Bxc6 Kxc6 52.Kf1 Kb7 53.c5 dxc5 54.Ke2 Kc6 55.Ke1 c4 56.h3 Kb7 57.Kd1 Kc6
= (0.19)   Depth: 16   00:00:08 515kN, tb=43
51.Bxc6 Kxc6 52.Kf1 Kb7 53.c5 dxc5 54.Ke2 Kc6 55.Ke1 c4 56.h3 Kb7 57.Kd1 c3
= (0.00)   Depth: 17   00:00:10 714kN, tb=51
51.Bxc6 Kxc6 52.h3 Kb7 53.Ke1 Ka7 54.Ke2 Kb7 55.Ke1 Ka7 56.Ke2 Kb7 57.Ke1 Ka7
= (0.00)   Depth: 18   00:00:17 1558kN, tb=93
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
³ (-0.50)   Depth: 19   00:00:21 1928kN, tb=160
51.a6 Nd4+ 52.Kd3 Kb6 53.Bb7 Kc7 54.g4 fxg3 55.hxg3 e2 56.Kd2 hxg3 57.f4 Kb6
= (0.00)   Depth: 19   00:00:23 2068kN, tb=167
51.a6 Kb6 52.g3 hxg3 53.hxg3 Nd4+ 54.Kd3 e2 55.Kd2 fxg3 56.f4 Kxa6 57.f5 Nxf5
µ (-0.73)   Depth: 20   00:00:45 4540kN, tb=287
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
³ (-0.62)   Depth: 20   00:00:47 4613kN, tb=363
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+
= (0.00)   Depth: 20   00:00:52 4851kN, tb=420
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Ne6 56.Kxe2 Nxf4+
= (0.00)   Depth: 21   00:00:58 5558kN, tb=461
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kc8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 22   00:01:12 6957kN, tb=628
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kc8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 23   00:01:23 8303kN, tb=795
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kc8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 24   00:01:58 14907kN, tb=1081
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kc8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 25   00:02:34 18998kN, tb=1607
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kc8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 26   00:03:17 23788kN, tb=2191

Analysis by Rybka 2.3.2 32-bit :

51.Bxc6 Kxc6 52.h3
+- (2.16)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.h3 Kb7
+- (2.29)   Depth: 6   00:00:00 0kN
51.Bxc6 Kxc6 52.h3 Kc7 53.Kd3
± (1.32)   Depth: 7   00:00:00 1kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3
+- (2.52)   Depth: 8   00:00:00 2kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3
+- (2.86)   Depth: 9   00:00:00 2kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6
+- (2.96)   Depth: 10   00:00:00 3kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4
+- (3.66)   Depth: 11   00:00:00 4kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7
+- (4.71)   Depth: 12   00:00:00 6kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7 56.a6
+- (5.52)   Depth: 13   00:00:01 102kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7 56.f5
+- (6.75)   Depth: 14   00:00:03 326kN, tb=3
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7 56.f5
+- (7.95)   Depth: 15   00:00:10 1052kN, tb=88
51.Bxc6 Kb8 52.g4 hxg3 53.hxg3 fxg3 54.Kxe3
+- (9.21)   Depth: 16   00:00:44 4404kN, tb=205
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7 56.f5
+- (10.73)   Depth: 17   00:02:11 13413kN, tb=499
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7 56.Kf3 Kc6 57.a6 g2
+- (10.66)   Depth: 18   00:03:12 19459kN, tb=807
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g3 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
³ (-0.56)   Depth: 19   00:04:57 30762kN, tb=946
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 19   00:05:01 30981kN, tb=967
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 20   00:05:05 31316kN, tb=990
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 21   00:05:09 31540kN, tb=1039
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 22   00:05:15 31954kN, tb=1128
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 23   00:05:26 32595kN, tb=1310
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 24   00:05:43 33596kN, tb=1625
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 25   00:06:09 35217kN, tb=2126
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 26   00:06:53 37787kN, tb=2956
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.a6 Ka7 57.Bb7 Kb6
= (0.00)   Depth: 27   00:07:53 41608kN, tb=4155

Analysis by Rybka 2.3.2a 32-bit :

51.Bxc6 Kxc6 52.h3
+- (2.16)   Depth: 5   00:00:00
51.Bxc6 Kxc6 52.h3 Kb7
+- (2.29)   Depth: 6   00:00:00 0kN
51.Bxc6 Kxc6 52.h3 Kc7 53.Kd3
± (1.32)   Depth: 7   00:00:00 1kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3
+- (2.52)   Depth: 8   00:00:00 2kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3
+- (2.86)   Depth: 9   00:00:00 2kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6
+- (2.96)   Depth: 10   00:00:00 3kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4
+- (3.66)   Depth: 11   00:00:00 4kN
51.Bxc6 Kxc6 52.h3 Kc7 53.g4 fxg3 54.Kxe3 Kc6 55.f4 Kc7
+- (4.71)   Depth: 12   00:00:00 6kN
51.Bxc6 Kxc6 52.h3 Kb7 53.g4 fxg3 54.Kxe3 Kc7 55.f4 Kc6 56.a6
+- (5.12)   Depth: 13   00:00:00 20kN
51.Bxc6 Kb8 52.h3 Ka7 53.Bb5 Kb7 54.Kd3 Ka7 55.c5
+- (6.72)   Depth: 14   00:00:04 401kN, tb=2
51.Bxc6 Kb8 52.h3 Ka7 53.Bb5 Kb7 54.Kd3 Ka7 55.c5
+- (6.93)   Depth: 15   00:00:07 684kN, tb=3
51.Bxc6 Kb8 52.h3 Ka7 53.Bb5 Kb7 54.Kd3 Ka7 55.c5
+- (7.07)   Depth: 16   00:00:11 1189kN, tb=4
51.Bxc6 Kb8 52.h3 Ka7 53.Bb5 Kb7 54.Kd3 Ka7 55.c5
+- (7.34)   Depth: 17   00:00:22 2287kN, tb=6
51.Bxc6 Kb8 52.h3 Ka7 53.Bb5 Kb7 54.Kd3 Ka7 55.c5
+- (7.42)   Depth: 18   00:00:47 5150kN, tb=13
51.Bxc6 Kxc6 52.Kf1 Kb7 53.g4 fxg3 54.h3 Ka6 55.f4 Kxa5 56.f5 Kb4 57.f6 Kc3
µ (-0.72)   Depth: 19   00:06:24 40857kN, tb=299
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 19   00:06:27 41050kN, tb=315
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 20   00:06:31 41350kN, tb=331
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 21   00:06:34 41549kN, tb=366
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 22   00:06:39 41918kN, tb=444
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 23   00:06:50 42570kN, tb=592
51.g4 hxg3 52.hxg3 Nd4+ 53.Kd3 e2 54.Kd2 fxg3 55.f4 Kb8 56.f5 Nxf5 57.Kxe2 Nh4
= (0.00)   Depth: 24   00:07:05 43505kN, tb=852

By josh

Date 2007-10-04 10:58

Rybka 2.1d3 32-bit (256 MB)

13.14 0:01   0.00    1.Kd3 Nd4 2.Kc3 Nb3 3.Kd3 Nd4 4.Kc3 Nb3
   5.Kd3 Nd4 6.Kc3 Nb3 7.Kd3 Nd4 (118.228) 76

14.01 0:02   -0.01 1.Kd3 Nd4 2.Kc3 Nb3 3.Kd3 Nd4 4.Kc3 Nb3
   5.Kd3 Nd4 6.Kc3 Nb3 7.Kd3 Nd4 (191.775) 74

14.02 0:02   0.00    1.Bxc6 Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6
   5.f4 Kxa5 6.f5 Kb4 7.c5 dxc5 (200.974) 74

14.03 0:03   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (221.134) 74

15.01 0:03   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (256.609) 74

16.01 0:04   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (319.499) 74

17.01 0:05   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (429.073) 74

18.01 0:08   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (620.469) 75

19.01 0:12   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (942.465) 75

20.01 0:12   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 4.Kd2 fxg3
   5.f4 Kb8 6.f5 Nxf5 7.Kxe2 Ka7 (943.412) 75

best move: g2-g4 time: 0:24.484 min n/s: 74.491 nodes: 1.781.174

this Rybka has no problem

By josh

Date 2007-10-04 11:02

Rybka 2.2n2 32-bit (256 MB)

13.00 0:00   +2.92 1.Bxc6 Kxc6 2.h3 Kb7 3.g4 fxg3 (56.473) 59

14.00 0:01   +2.14 1.Bxc6 Kxc6 2.h3 Kc5 3.Kf1 Kc6 4.g4 fxg3
   5.a6 g2+ 6.Kxg2 (101.807) 60

15.00 0:02   +3.42 1.Bxc6 Kxc6 2.h3 Kc5 3.Kf1 Kc6 4.g4 fxg3
   5.f4 d5 6.cxd5+ Kd7 7.f5 g2+ (137.475) 63

16.00 0:03   +3.64 1.Bxc6 Kxc6 2.h3 Kc5 3.Kf1 Kc6 4.g4 fxg3
   5.f4 Kb7 6.f5 g2+ 7.Kxg2 Kc6 (197.816) 64

17.00 0:05   -0.10 1.Bxc6 Kxc6 2.Kf1 Kb7 3.g4 fxg3 4.h3 Ka6
   5.f4 Kxa5 6.f5 Kb4 7.f6 Kc3 (368.813) 64

17.00 0:27   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 (1.716.492) 64

18.00 0:33   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 (2.149.159) 64

19.00 0:41   0.00    1.g4 hxg3 2.hxg3 Nd4+ 3.Kd3 e2 (2.624.745) 64

best move: g2-g4 time: 0:53.484 min n/s: 3.337.654 nodes: 3.337.654

even still slower but not lacking either

By Vasik Rajlich (Silver)

Date 2007-10-06 13:07

It certainly makes sense that this position is scored much worse starting with 2.3.2.

Vas

Topic Rybka Support & Discussion / Rybka Discussion / Strange Rybka 2.3.2a eval