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Up Topic Rybka Support & Discussion / Rybka Discussion / record time at which Rybka changed its mind
- - By rwbean [au] Date 2007-12-30 23:30
I thought this was amusing.  I really love microwine, I've been able to start using Rybka at home on my Macbook Pro because of it.

in the position after 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5 5. Nxf7 Bxf2+ 6. Kf1 Qe7 7. Nxh8 d5 8. exd5 Nd4 9. d6 Qxd6 10. Nf7 I waited 13 days for Rybka on my Macbook Pro to find the best move (10... Qe7) :-)
is anybody able to beat that and prove it with the output? ... or maybe I should ask also, what is the record number of ply that Rybka changes its mind at.

...

info depth 20 score cp -86 hashfull 0 time 562566 nodes 115483546 nps 210206 pv d6c5 d2d3 f2h4 c2c3 e5e4 f7e5 c5e5 d3e4 d4c6 b1d2 c8g4 d2f3 e5e4 d1e2
info depth 20 time 610219 nodes 122827967 nps 206115

info depth 21 score cp -62 hashfull 0 time 1567894 nodes 304105091 nps 198612 pv d6c5 d2d3 e5e4 c2c3 f2h4 c1f4 d4e6 f4g3 h4g3 h2g3 e8f7 b1d2 b7b5 c4e6
info depth 21 time 1654131 nodes 317954679 nps 196831

info depth 22 score cp -70 hashfull 0 time 4294898273 nodes 797891498 nps 190 pv d6c5 d2d3 f2h4 b2b4 c5e7 b1d2 c8g4 d2f3 g4f3 g2f3 b7b5 f7g5 b5c4 c2c3
info depth 22 time 270465 nodes 848572704 nps 3212757

info depth 23 score cp -75 hashfull 0 time 2192427 nodes 1196782719 nps 558972 pv d6c5 d2d3 f2h4 b2b4 c5e7 b1d2 c8g4 d2f3 g4f3 g2f3 b7b5 f7g5 b5c4 c2c3
info depth 23 time 4294017054 nodes 1367880801 nps 326

info depth 24 score cp -77 hashfull 0 time 4294534899 nodes 2200842432 nps 524 pv d6c5 d2d3 f2h4 b2b4 c5e7 b1d2 c8g4 d2f3 g4f3 g2f3 b7b5 f7g5 b5c4 c2c3
info depth 24 time 1780301 nodes 2514996463 nps 1446584

info depth 25 score cp -89 hashfull 0 time 711948 nodes 4983783214 nps 7168211 pv d6c5 d2d3 c8g4 d1d2 f2h4 b1c3 b7b5 b2b4 c5e7 c4b3 d4b3 a2b3 e8f7 g2g3
info depth 25 time 4293497428 nodes 6238419425 nps 1487

info depth 26 score cp -73 hashfull 0 time 1643135 nodes 20574540183 nps 12822031 pv d6c5 d2d3 e5e4 b2b4 c5f5 d3e4 f6e4 g2g4 f5g6 h2h3 c8e6 c4e6 d4e6 f7h8
info depth 26 time 4294199954 nodes 24536189119 nps 5850

info depth 27 score cp -77 hashfull 0 time 551377 nodes 43545549010 nps 80871422 pv d6c5 d2d3 e5e4 b2b4 c5f5 d3e4 f6e4 g2g4 f5g6 h2h3 c8e6 c4e6 d4e6 f7h8
info depth 27 time 1012304 nodes 51495120434 nps 52090086

info depth 28 score cp -77 hashfull 0 time 4293865432 nodes 93911898289 nps 22396 pv d6c5 d2d3 e5e4 b2b4 c5f5 d3e4 f6e4 g2g4 f5g6 h2h3 c8e6 c4e6 d4e6 f7h8
info depth 28 score cp -23 hashfull 0 time 4294592658 nodes 222031505695 nps 52941 pv d6e7 d2d3 c8g4 d1d2 g4e2 d2e2 d4e2 f1e2 b7b5 c4b3 c7c5 f7g5 f2h4 b1c3
info depth 28 time 4293808021 nodes 223125805123 nps 53211
Parent - - By Linus (***) [at] Date 2007-12-31 05:53
13 days? You ARE patient, aren't you?
Parent - - By Uly (Gold) [mx] Date 2007-12-31 20:15

> 13 days? You ARE patient, aren't you?


Well, the 13 days are going to pass whether you analyze a position or not, so why not to analyze it on these 13 days? ;)

Also, I wonder how much time would have been needed to find this best move with interactive analysis? Perhaps less than a day, I'm afraid.
Parent - - By rwbean [au] Date 2008-01-01 03:48
True, less than a day -- if by interactive analysis you mean looking at the first few PVs and deciding "well, this move is virtually forced", etc.  But my time is worth much more than my computer's time!
Parent - By Uly (Gold) [mx] Date 2008-01-01 05:48

> if by interactive analysis you mean looking at the first few PVs and deciding "well, this move is virtually forced", etc.


Interactive analysis meant that you use infinite analysis on several positions instead of one. I think this is what Centaurs do, so a good Centaur is good at knowing which lines should be looked at.
Parent - - By onursurme (***) [tr] Date 2008-01-01 11:49
Wait for my reply until 2009 !!
:)
Parent - By Fulcrum2000 (****) [nl] Date 2008-01-01 14:14
hehe :)
Parent - - By Uri Blass (*****) [il] Date 2008-01-01 15:03
record of number of plies is probably more than 28 and you should try endgames to prove it.

The foolowing endgame is a possible candidate
I wonder what depth rybka needs to find c5
depth 40 seems to be not enough but maybe more hash can help(I used 128 mbytes hash)

New game
2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - 0 1


Analysis by Rybka 2.3.2a 32-bit :

1.Bd4 Be7
  +-  (1.53)   Depth: 5   00:00:00
1.Bd4 Be7 2.Bc3
  +-  (1.57)   Depth: 6   00:00:00
1.Bd4 Be7 2.Bc3 Kd7
  +-  (1.57)   Depth: 7   00:00:00
1.Bd4 Be7 2.Bc3 Kd7 3.Ke3
  +-  (1.55)   Depth: 8   00:00:00  1kN
1.Bd4 Be7 2.Bg7 Kd7 3.Bh6 Bf6
  +-  (2.05)   Depth: 9   00:00:00  1kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Kc7 4.Kd3 Kd7
  +-  (2.05)   Depth: 10   00:00:00  2kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Kc7 4.Kd3 Kd7 5.Ke3 Kc7 6.Ke2 Kd7 7.Kd3 Kc8
  +-  (2.05)   Depth: 11   00:00:00  2kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Kc7 4.Kd3 Kd7 5.Kc3 Kc7 6.Kd3 Kd7 7.Kc3 Kc7
  +-  (2.05)   Depth: 12   00:00:00  3kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Kc7 4.Kd3 Kd8 5.Kc3 Kd7 6.Kb2 Ke7 7.Kb3 Kf8
  +-  (2.05)   Depth: 13   00:00:00  5kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Kc7 4.Kd3 Kd8 5.Kc3 Kd7 6.Kb2 Ke7 7.Kb3 Kf8
  +-  (2.05)   Depth: 14   00:00:00  7kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Kc7 4.Kd3 Kd8 5.Kc3 Kd7 6.Kb2 Ke7 7.Kb3 Kf8
  +-  (2.05)   Depth: 15   00:00:00  11kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 16   00:00:00  12kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 17   00:00:00  15kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 18   00:00:00  17kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 19   00:00:00  20kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 20   00:00:00  23kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 21   00:00:00  28kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 22   00:00:00  35kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 23   00:00:00  44kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 24   00:00:00  55kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 25   00:00:00  72kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 26   00:00:01  91kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 27   00:00:01  126kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 28   00:00:02  157kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 29   00:00:02  199kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 30   00:00:03  252kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 31   00:00:04  330kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 32   00:00:06  477kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 33   00:00:13  964kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 34   00:00:17  1221kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 35   00:00:21  1553kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 36   00:00:28  1993kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 37   00:00:38  2706kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 38   00:00:58  4142kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 39   00:01:28  6129kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6
  +-  (2.04)   Depth: 40   00:02:17  9546kN

(Uri, MyTown 01.01.2008)
Parent - By Gaмßito (****) [cr] Date 2008-01-02 11:09
Rybka takes more than 2 hours to reach at depth 48 but it was not able to find c5. I used 512mb.

Unfortunately, I had to stop their thinking and I am not sure how much time will take to find this move.

Analysis by Rybka 2.3.2a 32-bit :

  +-  (2.04)   Depth: 40   00:03:07  8214kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 41   00:05:05  13016kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 42   00:07:08  18747kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 43   00:11:50  31341kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 44   00:18:13  49675kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 45   00:33:44  98609kN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 46   00:49:26  144mN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 47   01:27:03  257mN
1.Bd4 Bxd4 2.Kxd4 Kd7 3.Kc3 Ke7 4.Kd3 Kf7 5.Kc2 Kg7 6.Kc1 Kg6 7.Kb1 Kf6 8.Kb2 Kg7 9.Kb1 Kf7 10.Kc1 Ke7 11.Kd2 Kf7 12.Ke2 Kf6 13.Kd2 Kg7 14.Ke3 Kf7 15.Ke2 Kf6 16.Kd2 Kg7
  +-  (2.04)   Depth: 48   02:08:51  384mN

(, AMD 02.01.2008)

Regards,
Gaмßito.
Parent - - By Vempele (Silver) [fi] Date 2008-01-01 15:36
Not sure about Rybka, but Toga needs 38 plies to find the winning continuation in the following position (it's from a busted study).

7k/5Bp1/6P1/8/6K1/5P2/8/2q5 b - - 2 5
Parent - - By Felix Kling (Gold) [de] Date 2008-01-01 17:11
Btw, you can update your avatar settings since there are no more serious chess plers :)
Parent - By Vempele (Silver) [fi] Date 2008-01-01 18:18
Done.
Parent - - By Intagrand (*) [gb] Date 2008-01-01 23:56
10... Qe7 at -0.23/28

If this is really -0.23 thats pretty amazing! What's the line after 11. c3 that allows such an even score?
Parent - - By BB (****) [gb] Date 2008-01-02 14:38
Bücker analysed the Traxler recently. This page of Jerz (see Refutation 4C4) is likely what you want: 11 c3 Bg4 12 Qa4+ Nd7, etc.

The given 13 cxd4 Bxd4 line [14 Ke1 Qf6 15 Rf1 Qh4+ 16 g3 Qxh2 17 Qa3 Qg2 18 Ng5 O-O-O] appears to be forced (especially if White has contempt) and correct: the evaluation of the R vs PPP imbalance [after 19 Nf3 Qxg3+ 20 Kd1 e4] seems to favour Black here.

The other White option is 13 Kxf2 Qh4+, for which the claim would be at least a draw after either 14 Ke3 Kf8 [15 g3 Nf5 16 Kf2 Nxg3, 15 Qa3+ c5, 15 Bd3 Nb6] or 14 Kf1 Bh5 15 Ng5 Qf4+ [15 Nxe5 O-O-O].
Parent - By Intagrand (*) [gb] Date 2008-01-02 16:55
Awesome :) Thanks a lot for those great links. I enjoyed the analysis.
Parent - - By Uri Blass (*****) [il] Date 2008-01-02 21:37
biggest depth so far was produced by Dann Corbit and I could reproduce it.

Rybka with all the 5 piece tablebases changes it's mind at depth 43
I am almost sure that it is possible to find a position when rybka needs more depth to change her mind.

New game
8/8/6p1/7b/7R/8/p1p5/k1K5 w - - 0 1


Analysis by Rybka 2.3.2a 32-bit :

1.Kc1xc2 Bh5-f3
  µ  (-1.02)   Depth: 5   00:00:00
1.Kc1xc2 Bh5-d1+ 2.Kc2-c1 Bd1-f3 3.Rh4-f4
  µ  (-0.98)   Depth: 7   00:00:00  2kN
1.Kc1xc2 Bh5-d1+ 2.Kc2-c1 Bd1-f3 3.Rh4-f4
  µ  (-0.98)   Depth: 7   00:00:00  2kN
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Be4-b1
  ³  (-0.47)   Depth: 8   00:00:01  3kN
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Be4-b1 4.Rh2-f2
  ³  (-0.47)   Depth: 9   00:00:01  3kN, tb=1
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Be4-b1 4.Rh2-f2 g6-g5
  =  (0.00)   Depth: 10   00:00:01  4kN, tb=1
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Be4-b1 4.Rh2-f2 g6-g5 5.Rf2-g2
  =  (0.00)   Depth: 11   00:00:01  4kN, tb=2
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2
  =  (0.00)   Depth: 12   00:00:01  7kN, tb=5
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2
  =  (0.00)   Depth: 13   00:00:01  9kN, tb=8
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2
  =  (0.00)   Depth: 14   00:00:03  13kN, tb=14
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2
  =  (0.00)   Depth: 15   00:00:03  18kN, tb=25
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2
  =  (0.00)   Depth: 16   00:00:04  29kN, tb=50
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2
  =  (0.00)   Depth: 17   00:00:05  41kN, tb=77
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5
  =  (0.00)   Depth: 18   00:00:06  59kN, tb=118
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5
  =  (0.00)   Depth: 19   00:00:07  86kN, tb=182
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5
  =  (0.00)   Depth: 20   00:00:08  118kN, tb=266
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5
  =  (0.00)   Depth: 21   00:00:09  165kN, tb=392
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5
  =  (0.00)   Depth: 22   00:00:12  244kN, tb=614
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 23   00:00:14  317kN, tb=835
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 24   00:00:16  398kN, tb=1122
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 25   00:00:19  512kN, tb=1531
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 26   00:00:23  664kN, tb=2076
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 27   00:00:32  858kN, tb=2818
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 28   00:00:40  1060kN, tb=3571
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 29   00:00:46  1297kN, tb=4460
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 30   00:00:59  1608kN, tb=5679
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 31   00:01:11  2028kN, tb=7263
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 32   00:01:28  2590kN, tb=9463
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 33   00:01:45  3138kN, tb=12006
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 34   00:02:03  3790kN, tb=15002
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 35   00:02:25  4571kN, tb=18786
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 36   00:02:53  5566kN, tb=23568
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 37   00:03:23  6740kN, tb=29438
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 38   00:04:09  8239kN, tb=37082
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 39   00:05:34  9953kN, tb=45947
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 40   00:07:04  13175kN, tb=59112
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 41   00:08:24  16346kN, tb=73025
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 42   00:09:54  19377kN, tb=88272
1.Kc1xc2 Bh5-f3 2.Rh4-h2 Bf3-e4+ 3.Kc2-b3 Ka1-b1 4.Rh2-b2+ Kb1-c1 5.Kb3xa2 g6-g5 6.Rb2-b4 Be4-d5+ 7.Ka2-a3 Bd5-f3
  =  (0.00)   Depth: 43   00:11:29  22879kN, tb=106426
1.Rh4-h1 Bh5-f3 2.Rh1-e1 Bf3-d1 3.Re1-g1 g6-g5 4.Rg1-h1 Bd1-f3 5.Rh1-e1 Bf3-d1 6.Re1-g1 g5-g4 7.Rg1-e1 g4-g3
  +-  (2.50)   Depth: 43   00:11:31  22898kN, tb=106528
1.Rh4-h1 Bh5-f3 2.Rh1-e1 Bf3-d1 3.Re1-g1 g6-g5 4.Rg1-h1 Bd1-f3 5.Rh1-e1 Bf3-d1 6.Re1-g1 g5-g4 7.Rg1-e1 g4-g3 8.Re1-g1 g3-g2 9.Rg1-e1 g2-g1Q 10.Re1xg1 Bd1-f3 11.Kc1xc2+ Bf3-d1+ 12.Rg1xd1#
  +-  (#12)   Depth: 43   00:11:38  22967kN, tb=107004
1.Rh4-h1 Bh5-f3 2.Rh1-e1 Bf3-d1 3.Re1-g1 g6-g5 4.Rg1-h1 Bd1-f3 5.Rh1-e1 Bf3-d1 6.Re1-g1 g5-g4 7.Rg1-e1 g4-g3 8.Re1-g1 g3-g2 9.Rg1-e1 g2-g1Q 10.Re1xg1 Bd1-f3 11.Kc1xc2+ Bf3-d1+ 12.Rg1xd1#
  +-  (#12)   Depth: 44   00:11:48  23208kN, tb=108275

(,  02.01.2008)
Parent - - By Banned for Life (Gold) Date 2008-01-02 23:18
Very impressive change from 0.00 at the start of depth 43 to mate in 12 at the start of depth 44.

It would be interesting to see if anyone can come up with a change from very high score for one side (hopefully not mate!) to mate for the other side at very high depth.

Alan
Parent - - By Gaмßito (****) [cr] Date 2008-01-03 08:54 Edited 2008-01-03 09:00
Zappa is exactly the opposite to Rybka there.

It sees the mate in 12 very quickly and at lower depths, but then change completely their mind and thinks that the position it is equal. Look:

8/8/6p1/7b/7R/8/p1p5/k1K5 w - - 0 1


Analysis by Zappa Mexico :

1.Kxc2 Bd1+ 2.Kc1 Bf3 3.Rh3 Be4 4.Rg3 Bf5 5.Ra3 g5 6.Ra5 Bg4
  =/+  (-0.29)   Depth: 11/18   00:00:01  112kN
1.Kxc2 Bd1+ 2.Kc1 Bf3 3.Rh3 Be4 4.Rg3 Bf5 5.Ra3 g5 6.Ra5 Bg4
  =/+  (-0.29)   Depth: 11/18   00:00:01  119kN
1.Kxc2 Bd1+ 2.Kc1 Bf3 3.Rh3 Bg4 4.Ra3 Bd7 5.Ra5 Bc6 6.Ra7 Bd5 7.Ra5 Be4 8.Ra3 Bf5 9.Ra8 g5 10.Ra5 Bb1 11.Rxg5 Be4 12.Ra5
  =  (-0.25)   Depth: 12/20   00:00:01  165kN
1.Kxc2 Bd1+ 2.Kc1 Bf3 3.Rh3 Bg4 4.Ra3 Bd7 5.Ra5 Bc6 6.Ra7 Bd5 7.Ra5 Be4 8.Ra3 Bf5 9.Ra8 g5 10.Ra5 Bb1 11.Rxg5 Be4 12.Ra5
  =  (-0.25)   Depth: 12/20   00:00:01  177kN
1.Kxc2 Bd1+ 2.Kxd1 Kb2 3.Rh2+ Kb3 4.Rxa2 Kxa2 5.Ke2 Kb2 6.Kf3 Kb1 7.Kg4 Kc1 8.Kg5 Kb1 9.Kxg6
  =  (0.00)   Depth: 13/22   00:00:02  310kN
1.Kxc2 Bd1+ 2.Kxd1 Kb2 3.Rh2+ Kb3 4.Rxa2 Kxa2 5.Ke2 Kb2 6.Kf3 Kb1 7.Kg4 Kc1 8.Kg5 Kb1 9.Kxg6
  =  (0.00)   Depth: 13/22   00:00:02  324kN
1.Kxc2 Bd1+ 2.Kxd1 Kb2 3.Rh2+ Kb3 4.Rxa2 Kxa2 5.Ke2 Kb2 6.Kf3 Kb1 7.Kg4 Kc1 8.Kg5 Kb1 9.Kxg6
  =  (0.00)   Depth: 14/23   00:00:02  459kN
1.Kxc2 Bd1+ 2.Kxd1 Kb2 3.Rh2+ Kb3 4.Rxa2 Kxa2 5.Ke2 Kb2 6.Kf3 Kb1 7.Kg4 Kc1 8.Kg5 Kb1 9.Kxg6
  =  (0.00)   Depth: 14/23   00:00:02  477kN
1.Kxc2 Bd1+ 2.Kxd1 Kb2 3.Rh2+ Kb3 4.Rxa2 Kxa2 5.Ke2 Kb2 6.Kf3 Kb1 7.Kg4 Kc1 8.Kg5 Kb1 9.Kxg6
  =  (0.00)   Depth: 15/27   00:00:03  597kN
1.Rh1
  =  (0.01)   Depth: 15/27   00:00:03  657kN
1.Rh1 Bd1 2.Rg1 g5 3.Rxg5 Be2 4.Kxc2 Bd3+ 5.Kc1 Bf5 6.Rg3 Bd3 7.Rg7 Be4 8.Ra7 Bd5 9.Kc2
  =  (0.05)   Depth: 15/27   00:00:03  716kN
1.Rh1 Bd1 2.Rg1 g5 3.Rxg5 Be2 4.Kxc2 Bd3+ 5.Kc1 Bf5 6.Rg3 Bd3 7.Rg7 Be4 8.Ra7 Bd5 9.Kc2
  =  (0.05)   Depth: 15/27   00:00:03  735kN
1.Rh1 Bd1 2.Rg1 g5 3.Rxg5 Be2 4.Kxc2 Bd3+ 5.Kc1 Bf5 6.Rg3 Bd3 7.Rg7 Be4 8.Ra7 Bd5 9.Kc2 Be4+ 10.Kc3 Kb1 11.Rxa2 Kxa2
  =  (0.05)   Depth: 16/27   00:00:04  819kN
1.Rh1 Bd1 2.Rg1 g5 3.Rxg5 Be2 4.Kxc2 Bd3+ 5.Kc1 Bf5 6.Rg3 Bd3 7.Rg7 Be4 8.Ra7 Bd5 9.Kc2 Be4+ 10.Kc3 Kb1 11.Rxa2 Kxa2
  =  (0.05)   Depth: 16/27   00:00:05  1037kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rh1 Bf3 5.Re1 Bd1 6.Rg1 g4 7.Re1 g3 8.Rg1 g2 9.Re1 g1Q 10.Rxg1 Bg4 11.Kxc2+ Bd1+ 12.Rxd1#
  +-  (#12)   Depth: 17/27   00:00:07  1542kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rh1 Bf3 5.Re1 Bd1 6.Rg1 g4 7.Re1 g3 8.Rg1 g2 9.Re1 g1Q 10.Rxg1 Bg4 11.Kxc2+ Bd1+ 12.Rxd1#
  +-  (#12)   Depth: 17/27   00:00:08  1760kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rh1 Bf3 5.Re1 Bd1 6.Rg1 g4 7.Re1 g3 8.Rg1 g2 9.Re1 g1Q 10.Rxg1 Bg4 11.Kxc2+ Bd1+ 12.Rxd1#
  +-  (#12)   Depth: 18/27   00:00:10  2053kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rh1 Bf3 5.Re1 Bd1 6.Rg1 g4 7.Re1 g3 8.Rg1 g2 9.Re1 g1Q 10.Rxg1 Bg4 11.Kxc2+ Bd1+ 12.Rxd1#
  +-  (#12)   Depth: 18/27   00:00:10  2147kN

1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra7 Be4 12.Ra5
  =  (0.05)   Depth: 19/34   00:00:17  3719kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra7 Be4 12.Ra5
  =  (0.05)   Depth: 19/34   00:00:24  5411kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Ra7 Bf5 15.Ra5 Be4
  =  (0.05)   Depth: 20/35   00:00:28  6611kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Ra7 Bf5 15.Ra5 Be4
  =  (0.05)   Depth: 20/35   00:00:30  7207kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Ra7 Bf5 15.Ra5 Be4
  =  (0.05)   Depth: 21/35   00:00:33  8037kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Ra7 Bf5 15.Ra5 Be4
  =  (0.05)   Depth: 21/35   00:00:38  9390kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Ra4
  =  (0.05)   Depth: 22/35   00:00:46  11836kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Ra4
  =  (0.05)   Depth: 22/43   00:00:55  14793kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Rg4 Be6 13.Rg5 Bb3 14.Ra5 Be6 15.Ra7 Bf5 16.Ra8 Be4
  =  (0.05)   Depth: 23/43   00:01:09  19182kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Rg4 Be6 13.Rg5 Bb3 14.Ra5 Be6 15.Ra7 Bf5 16.Ra8 Be4
  =  (0.05)   Depth: 23/43   00:01:25  24627kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Rg4 Be6 13.Rg1 Bf5 14.Rg2 Bd7 15.Rg7 Ba4 16.Ra7 Bb3
  =  (0.05)   Depth: 24/43   00:01:55  34192kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Rg4 Be6 13.Rg1 Bf5 14.Rg2 Bd7 15.Rg7 Ba4 16.Ra7 Bb3
  =  (0.05)   Depth: 24/43   00:02:29  45997kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Ra7 Bd5
  =  (0.05)   Depth: 25/43   00:03:11  59820kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Ra7 Bd5
  =  (0.05)   Depth: 25/43   00:04:30  87064kN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Rg4 Bf5 15.Kd2 Bxg4 16.Ke3 Kb1
  =  (0.05)   Depth: 26/45   00:06:09  121mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Rg4 Bf5 15.Rg1 Bb1 16.Rg2 Be4
  =  (0.05)   Depth: 26/45   00:07:00  140mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Rg4 Bf5 15.Rg5 Bb1 16.Ra5 Be4
  =  (0.05)   Depth: 27/45   00:09:20  187mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Be4 14.Rg4 Bf5 15.Rg5 Bb1 16.Ra5 Be4
  =  (0.05)   Depth: 27/50   00:10:58  221mN

(, AMD 03.01.2008)

Regards,
Gaмßito.
Parent - - By Banned for Life (Gold) Date 2008-01-03 09:16
False mate in 12 has to be a bug, no?

Alan
Parent - - By Uri Blass (*****) [il] Date 2008-01-03 09:59
The mate in 12 is correct
The bug is that zappa stops to see the mate.

This should never happen with a program that has no bugs.

Uri
Parent - By Banned for Life (Gold) Date 2008-01-03 10:56
Interesting position. No problem seeing the mate after Rh1, but go back to the original position and it refuses to make this move.
Parent - - By Gaмßito (****) [cr] Date 2008-01-03 10:08
Zappa has seen a little farther now, but anyway it does not want to change their thinking at all. Total equality is what it sees.

Analysis by Zappa Mexico :

1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Kc2 Be4+ 14.Kc1 Bd5
  =  (0.05)   Depth: 28/54   00:16:58  331mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Bc6 14.Rg4 Bf3 15.Rg3 Be4 16.Rg4 Bf5
  =  (0.05)   Depth: 28/54   00:21:31  422mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Bc6 14.Ra7 Be4 15.Ra5
  =  (0.05)   Depth: 29/54   00:32:47  632mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Rg7 Bc6 14.Ra7 Be4 15.Ra5
  =  (0.05)   Depth: 29/54   00:44:35  868mN
1.Rh1 Bf3 2.Re1 Bd1 3.Rg1 g5 4.Rxg5 Bg4 5.Kxc2 Bd1+ 6.Kc1 Bf3 7.Ra5 Be4 8.Ra4 Bd5 9.Ra3 Be4 10.Ra5 Bd5 11.Ra4 Bb3 12.Ra7 Bd5 13.Ra5 Be4
  =  (0.05)   Depth: 30/64   01:27:53  1608mN

(, AMD 03.01.2008)

Regards,
Gaмßito.
Parent - By Uri Blass (*****) [il] Date 2008-01-03 10:48
having a mate score and later losing it is clearly a bug and I do not think that it is interesting what happens later.
If you see mate for yourself you should never lose the mate score.

Uri
Parent - - By noctiferus (***) [it] Date 2008-01-03 11:02
Shredder11 with 4 men egbb gets mate in 12 at ply 16
Parent - By noctiferus (***) [it] Date 2008-01-03 13:13
sorry, shredderbases
Parent - By Gaмßito (****) [cr] Date 2008-01-03 05:27
Another question can be if there is some position where Rybka could need even much more depth, than their maximum depth limit (59).

Some time ago, I remember that Vas said that he would like to see a position where more depth could be necessary - for Rybka to solve the position - but nobody could give an example.

Regards,
Gaмßito.
Up Topic Rybka Support & Discussion / Rybka Discussion / record time at which Rybka changed its mind

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