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Up Topic The Rybka Lounge / Test Positions / a question of style
- - By ghost (**) Date 2012-03-21 00:01 Edited 2012-03-21 00:06
Hi,

in the following position is already winning for white. However white has a nice way to finish the game.

On my slow Laptop Critter 1.4 and Stockfish 2.2.2 did not find the aesthetic move within 3 minutes.

I enjoyed studying the complications after Bxh6! on my own.

r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - -
Parent - By Pia (***) [ru] Date 2012-03-22 03:00
Calculators can't play chess, indeed.

Tactix style

Analysis by Critter 1.4 32-bit:

1.Be3xh6 g7xh6 2.Qg4-h5 b6-b5 3.g2-g4 Qa5-c7 4.g4xf5 Rf8xf5 5.Qh5xh6 Qc7-g7 6.Qh6-h7+ Kg8-f8 7.Qh7-h4 Bc8-d7 8.Nf3-g5 Ra8-b8 9.Ng5-h7+ Kf8-e8 10.Nh7-f6+ Ke8-d8 11.Nf6xd5+ Kd8-c8 12.Nd5-e7+ Kc8-c7 13.Ne7xf5 Qg7xg6 14.Nf5-d6 Qg6-g8 15.a3-a4 b5-b4 16.c3xb4 Qg8-f8 17.b4-b5 Qf8-f3 18.Rh1-h3 Qf3-g2 19.Rh3-h2 Qg2-f3 20.Ra1-g1 Qf3-f8 21.Rh2-h3 a7-a6 22.Rg1-a1 Qf8-g7 23.b5xa6 Qg7-f8 24.a6-a7 Rb8-a8 25.Nd6xc4 Qf8-g7 26.Rh3-g3 Qg7-f8 27.Rg3-b3 Ra8xa7 28.Ra1-b1 Bd7xa4 29.Rb3-b6 Ba4-c6 30.Nc4-d6 Ra7-a8 31.Qh4-h7+ Kc7-d8 32.Nd6-f7+ Kd8-d7 33.Nf7-g5+ Kd7-e8 34.Rb6xc6 Qf8xf2+ 35.Kd2-c1
+-  (9.97)    Depth: 24/75   00:56:18  12899mN, tb=447 :wink:
Parent - - By Akbarfan (***) Date 2012-03-22 23:12
Hi,
from what game is this position ?
Parent - By ghost (**) Date 2012-03-23 09:53 Edited 2012-03-23 10:10
Here is the game. 14 .. b6 looks terrible to me. Black Queen is from there on stuck on the queenside

[Event "kaktus, Blitz 5m+3s"]
[Site "Microsoft"]
[Date "2012.03.21"]
[Round "1"]
[White "Deep Junior 13"]
[Black "Fritz 7"]
[Result "1-0"]
[BlackElo "0"]
[Classes "0"]
[ECO "C18"]
[GameID "0"]
[TimeControl "300+3"]
[WhiteElo "0"]

{Intel(R) Core(TM)2 Duo CPU     T6570  @ 2.10GHz 2094 MHz  W=21.3 plies; 1.
732kN/s; Junior13.ctg  B=11.8 plies; 1.613kN/s; Junior13.ctg}  1. e4 {B 0}
1... e6 {B 0}  2. d4 {B 0}  2... d5 {B 0}  3. Nc3 {B 0}  3... Bb4 {B 0}  4. e5
{B 0}  4... c5 {B 0}  5. a3 {B 0}  5... Bxc3+ {B 0}  6. bxc3 {B 0}  6... Ne7
{B 0}  7. Qg4 {B 0}  7... O-O {B 0}  8. Bd3 {B 0}  8... Nbc6 {B 0}  9. Qh5 {B
0}  9... Ng6 {B 0}  10. Nf3 {B 0}  10... Qc7 {B 0 Beide letzter Buchzug}  11.
Be3 {0.00/0 0}  11... c4 {0.37/12 9}  12. Bxg6 {0.00/0 0}  12... fxg6 {0.41/14
9}  13. Qg4 {0.00/0 0}  13... Qa5 {0.28/14 12}  14. Kd2 {0.22/17 9 (Le3-d2)}
14... b6 {-0.09/13 10  (b7-b5)}  15. h4 {1.17/17 14}  15... Ne7 {-0.06/14 17}
16. h5 {1.17/18 4 (Kd2-c1)}  16... Nf5 {0.31/13 9}  17. hxg6 {1.59/19 16}
17... h6 {2.31/14 22}  18. Bxh6 {2.01/21 52}  18... gxh6 {5.41/14 21}  19. Qh5
{4.05/18 10}  19... Qb5 {2.50/13 8 (b6-b5)}  20. g4 {4.78/17 2}  20... Qd7
{3.78/14 13}  21. gxf5 {5.01/16 5}  21... Rxf5 {5.00/14 12}  22. Qxh6 {5.43/16
3}  22... Qg7 {5.56/14 7}  23. Qh7+ {5.79/18 7 (Dh6-e3)}  23... Kf8 {5.19/13 6}
  24. Qh4 {8.91/18 36  (Kd2-e3)}  24... Bd7 {5.94/14 11 (Kf8-g8)}  25. Ng5
{11.13/19 71}  25... Kg8 {6.06/13 6  (a7-a5)}  26. Rag1 {13.20/19 15 (Sg5-f7)}
26... Re8 {8.34/13 9}  27. Nh7 {13.62/18 4  (Sg5-f7)}  27... Ref8 {11.72/14 6
(Ld7-c6)}  28. Nf6+ {17.05/16 1}  28... R8xf6 {16.75/16 15  (Tf5xf6)}  29.
exf6 {#13/16 1}  29... Rxf6 {#16/15 16}  30. Qh7+ {#12/17 1}  30... Kf8
{#15/14 2}  31. Qxg7+ {#11/19 1}  31... Kxg7 {#13/13 0}  32. Rh7+ {#10/19 1}
32... Kg8 {#12/12 0}  33. g7 {#9/19 4}  33... Be8 {#13/10 0 (Tf6xf2+)}  34.
Rh8+ {#7/16 1}  34... Kf7 {#6/7 0}  35. g8=Q+ {#6/16 1}  35... Ke7 {#5/6 0}
36. Rg7+ {#5/19 3 (Dg8xe8+)}  36... Kd6 {#4/6 0}  37. Qxe8 {#4/ 25 4}  37...
Rxf2+ {#3/5 0}  38. Ke1 {#3/60 16 (Kd2-e3)}  38... Rf1+ {#2/5 0 (Tf2-f7)}  39.
Kxf1 {#2/60 1}  39... e5 {#1/2 0 (a7-a5)}  40. Rh6# {#1/60 2}  1-0
Parent - - By Master Om (*****) [in] Date 2012-03-23 02:32
My Stock says something different!!!

New game
r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - - 0 1


Analysis by Stockfish 2.2.2 JA 64bit-200:

1.Rxh6 gxh6 2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Kxf8 5.Rh8+ Kg7 6.Rh7+ Kf8 7.Qh5 Ke8 8.g7+ Kd7 9.g8Q Kc7 10.Rxe7+ Nxe7 11.Qhh7
+-  (20.87 ++)    Depth: 31/59   00:02:09  1079mN
(Prakash, Bhubaneswar 23.03.2012)

And Spark also.....

New game
r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - - 0 1


Analysis by SPARK-1.0-win64-mp-corei:

1.Rxh6 gxh6 2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Qxf8 5.Rh7 a5 6.Qh5 Nh6 7.Rxh6 Qg7 8.Rh7 Ra7 9.Qh4 Qxh7 10.gxh7+ Kh8 11.Qd8+ Kxh7 12.Qxc8 Rg7 13.Qxe6 a4 14.Qxd5 Rxg2 15.Qf7+ Kh8
+-  (14.79)    Depth: 23/62   00:00:55  676mN
(Prakash, Bhubaneswar 23.03.2012)

Zappa Tactical Thinks different.

New game
r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - - 0 1


Analysis by Zappa Mexico II x64 Tactical:

1.Bxh6 gxh6 2.Qh5 Qa4 3.g4 Qd7 4.gxf5 Rxf5 5.Qxh6 Qg7 6.Qe3 Bd7 7.Rh7 Qxg6 8.Rh6 Qg7 9.Rg1 Qxg1 10.Nxg1 Raf8 11.Ne2
+-  (6.79)    Depth: 15   00:00:01  0kN
(Prakash, Bhubaneswar 23.03.2012)

After some tweaking in Stock I got these :-)

New game
r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - - 0 1


Analysis by Stockfish 2.2.2 JA 64bit-200:

1.Bxh6 gxh6 2.Qh5 b5 3.g7 Qd8 4.g4 Nxg7 5.Qxh6 Qe7 6.Ng5 Nh5 7.Qxh5 Qg7 8.Rh2 Bd7 9.Rah1 Rae8 10.f4 Rxf4 11.Qh8+ Qxh8 12.Rxh8+ Kg7 13.Rxe8 Rf2+ 14.Ke3 Bxe8 15.Kxf2 Bf7 16.Nxf7 Kxf7 17.Rh7+ Kg6 18.Rxa7 Kg5 19.Kf3 Kg6
+-  (11.27)    Depth: 31/63   00:00:59  474mN
(Prakash, Bhubaneswar 23.03.2012)

But Need to see which one is better Rxh6 or Bxh6 ?
Parent - - By Barnard (Bronze) Date 2012-03-23 03:32
Hi Om

without analising the position,your question has an easy answer:if the position is won for white,the move that minimizes your chances to dont make a wrong move,and maximizes the chances of your opponent to dont find the good defense

in other words,dont play 'beauty',play 'economic' (shortest way to give check-mate to your opponent)

so,see the analisis,look if one line is 'economic' (a semi-forced line),and play the line that gives you the safest way to achieve the win
Parent - - By Master Om (*****) [in] Date 2012-03-23 07:50
My temperament is different. I always tend to play beauty.....:yell:
Parent - - By Uly (Gold) [mx] Date 2012-03-23 15:54
By the way, have you found a winning line in our game? :grin:
Parent - - By Master Om (*****) [in] Date 2012-03-23 16:52
No. I haven't Looked upon it. I have all my analysis lost after my OS crash. I had to reinstall Windows 7. But the problem still persists. My Mouse is freezing everytime. Dunno why. Ran memtest no probs, CPU temp is fine at 48 C... Still not figured out the problem.
I will Start on this Saturday an post move on sunday.
Parent - - By Uly (Gold) [mx] Date 2012-03-23 20:26

> I have all my analysis lost after my OS crash.


Oh, I'm sorry to hear that :sad:
Parent - By Master Om (*****) [in] Date 2012-03-24 01:43
:fat:
Parent - - By Barnard (Bronze) Date 2012-03-23 23:55
buy a new mouse Om,im sure will stop the problemsa easier than struggle your head trying to find the problem
Parent - - By Master Om (*****) [in] Date 2012-03-24 01:43
Does Mouse changing will solve this ?
Parent - - By Barnard (Bronze) Date 2012-03-24 01:48
maybe not,since the controllers are installed with windows 7...

or the mouse install it own controllers?

do you installed any program,and after installing that program,the OS start freezing?
Parent - - By Master Om (*****) [in] Date 2012-03-24 01:50
Even after fresh Instal 1 out of 3 times mouse freezes. I have to use keyboard only. All data crashes too. CPU temp is ok. RAM is ok. I Ran Memtest. Just doubt about Hardrive.
Parent - - By Barnard (Bronze) Date 2012-03-24 01:52
are you using a laptop,or a desktop Om?
Parent - - By Master Om (*****) [in] Date 2012-03-24 01:54
Desktop.
Parent - - By Barnard (Bronze) Date 2012-03-24 02:20
run an extensive test to ALL your computer Om
Parent - - By Master Om (*****) [in] Date 2012-03-24 02:23
Whats that ?
Parent - - By Barnard (Bronze) Date 2012-03-24 02:25
i told you that download software that runs test for ALL the hardware on your computer Om,and run all the tests
Parent - - By Master Om (*****) [in] Date 2012-03-24 02:30
Ok Thanks and Thanks......
I will run it Later and tell you.
Parent - - By Barnard (Bronze) Date 2012-03-24 02:38
another option is download software that checks conflicts between the drivers Om...now im unsure about the name of that software,but you can check about the name at Google
Parent - - By Master Om (*****) [in] Date 2012-03-24 06:55
No Idea about that.
Parent - - By Uly (Gold) [mx] Date 2012-03-24 14:32
You can check for that without needing special software.

In the Control Panel double click the System icon, and on the Window that appears go to the "Hardware" tab and click on the Device Manager button.

On the Device Manager window, if there's any driver conflict, it'll have a yellow circle with a ! inside, and you've found your problem. If you don't see any of that, click on the [+] at the left of "Mice and other pointing devices", right click on HID-complaint Mouse, and click "Properties".

There, click on the Driver Tab, then try "Roll Back Driver". If it tells you that there is no previous driver to roll to, then cancel and click "Update Driver". If it tells you that your drivers are up to date then this is not a driver problem.

If you have the mouse in a USB port, try connecting it to a different port.

And finally, I used to suffer from this freezing Mouse problem (only on 64bit, on 32bit it was running fine), the only solution was to switch to a different Mouse.
Parent - - By Master Om (*****) [in] Date 2012-03-24 14:50
All the drivers are upto date. I have tried to a different port. The problem still persists.
I think I need new mouse.
Parent - By Barnard (Bronze) Date 2012-03-24 15:35

>I think I need new mouse.


is the first that i told you Om,that you must buy a new mouse
Parent - - By Barnard (Bronze) Date 2012-03-24 15:40
google about it Om,i dont remember the name,and it will help you to check if there is any driver conflit,evenif isnt recognized by the OS
Parent - - By Master Om (*****) [in] Date 2012-03-25 02:44
what should I check ?
Parent - By Barnard (Bronze) Date 2012-03-26 00:17
check for 'software detect driver conflict' or something similar,until you find a good program that checks the driver's conflicts
Parent - - By Barnard (Bronze) Date 2012-03-23 23:59
i understand you Om,and i always try to play to demolis my opponent if i can,not simply 'win' him...but is an error (even if i also play like you) play 'beauty' because that maximizes the chances to make errors...Dvoretsky said that when you can win in an easy variant,play 'beauty' or play with complications,is always an error
Parent - - By Master Om (*****) [in] Date 2012-03-24 01:45
I know that, But I am a Intuitive player.
Parent - - By Barnard (Bronze) Date 2012-03-24 01:51
intuition against engines,you will losse 99,99 % of the games Om...you must trust in tactics,and engines are the king of the tactics...and engines doesnt play beauty,they play 'economic' (play the shortest way to give check-mate,or play the line that gives it the high score,not play 'beauty'(starting from the point that engines doesnt understand what is beauty)
Parent - - By Master Om (*****) [in] Date 2012-03-24 01:53

>intuition against engines,you will losse 99,99 % of the games Om...you must trust in tactics,


Not always. My Intuition always runs on tactics and exchange sacs. Engines sucks when it comes to understand compensation.
Parent - By Barnard (Bronze) Date 2012-03-24 02:10
i agree with you about sacs;generally,if the sac. is a 'long time sac.',engine doesnt understand it
Parent - - By Uly (Gold) [mx] Date 2012-03-23 04:06

> But Need to see which one is better Rxh6 or Bxh6 ?


Rxh6 is best.

The thing is, that this position:

r1b2rk1/p7/1p2p1Pp/q2pP3/2pP2Q1/P1P2N2/2PK1PP1/R7 w - -


(In where order of captures doesn't matter)

22/64   6:53     +M11  2.Rxh6 gxh6 3.Rh1 Qxa3 4.Rxh6 Qe7 5.Qh5 Qg7 6.Rh7 Rf5 7.Rxg7+ Kxg7 8.Qh7+ Kf8 9.g7+ Ke8 10.g8Q+ Rf8 11.Qhf7+ Kd8 12.Qgxf8+ (2.109.480.440) 5098

Is a mate in 10 if the rook is hanging there.

With the Bishop hanging there

r1b2rk1/p5p1/1p2p1PB/q2pP3/2pP2Q1/P1P2N2/2PK1PP1/R7 b - -


20/61   0:58   +18.75--  2...Qb5 3.Bg5 Rf5 4.Qh5 Rxg5 5.Nxg5 Kf8 6.Qh8+ Ke7 7.Qxg7+ Kd8 8.Qf8+ Kc7 9.g7 Kb7 10.g8Q Rb8 11.Nxe6 Qd7 12.Qgg7 Ka8 13.Qxd7 Bxd7 14.Qe7 Bxe6 15.Qxe6 Rd8 (270.925.747) 4663
20/61   0:59   +19.85--  2...Qb5 3.Bg5 Rf5 4.Qh5 Rxg5 5.Nxg5 Kf8 6.Qh8+ Ke7 7.Qxg7+ Kd8 8.Qf8+ Kc7 9.g7 Kb7 10.g8Q Rb8 11.Nxe6 Qd7 12.Qgg7 Ka8 13.Qxd7 Bxd7 14.Qe7 Bxe6 15.Qxe6 Rd8 (278.865.425) 4649
20/61   1:02   +21.50--  2...Qb5 3.Bg5 Rf5 4.Qh5 Rxg5 5.Nxg5 Kf8 6.Qh8+ Ke7 7.Qxg7+ Kd8 8.Qf8+ Kc7 9.g7 Kb7 10.g8Q Rb8 11.Nxe6 Qd7 12.Qgg7 Ka8 13.Qxd7 Bxd7 14.Qe7 Bxe6 15.Qxe6 Rd8 (289.051.199) 4661
20/61   1:04   +23.98--  2...Qb5 3.Bg5 Rf5 4.Qh5 Rxg5 5.Nxg5 Kf8 6.Qh8+ Ke7 7.Qxg7+ Kd8 8.Qf8+ Kc7 9.g7 Kb7 10.g8Q Rb8 11.Nxe6 Qd7 12.Qgg7 Ka8 13.Qxd7 Bxd7 14.Qe7 Bxe6 15.Qxe6 Rd8 (299.528.061) 4675
20/61   1:04     +M9   2...Qb5 3.Bg5 Qe8 4.Qh5 Qxg6 5.Qxg6 Rb8 6.Bf6 Rb7 7.Ng5 Rxf6 8.exf6 Kf8 9.Nh7+ Kg8 10.Qe8+ Kxh7 11.Rh1+ (302.945.125) 4692
20/61   1:22   +24.84  2...Bd7 3.Bg5 Rf5 4.Qh3 Rxg5 5.Nxg5 Kf8 6.Qh8+ Ke7 7.Qxg7+ Kd8 8.Qf8+ Kc7 9.Qxa8 Qa6 10.g7 Qc8 11.g8Q Qxg8 12.Qxg8 Kb7 13.Nxe6 Ka6 14.Nf4 Kb7 15.Qxd5+ Bc6 (403.006.711) 4886

So black has to capture with the pawn first.

Then it becomes a question of, which of these two positions is better?

r1b2rk1/p7/1p2p1Pp/q2pPn2/2pP2Q1/P1P2N2/2PK1PP1/R6R w - -


22/59   1:16   +7.01++  2.Qh5 b5 3.g4 Qc7 4.gxf5 Rxf5 5.Qxh6 Qg7 6.Qxg7+ Kxg7 7.Rag1 Bb7 8.Rh7+ Kg8 9.Rg3 Bc6 10.Rgh3 Rxf3 11.Rxf3 Be8 12.Re7 Bxg6 13.Rxe6 Bh7 14.Re7 Be4 15.Rg3+ (334.384.015) 4345
22/65   2:14   +7.42++  2.Qh5 b5 3.g4 Qc7 4.gxf5 Rxf5 5.Qxh6 Qg7 6.Qxg7+ Kxg7 7.Rag1 Bb7 8.Rh7+ Kg8 9.Rg3 Bc6 10.Rgh3 Rxf3 11.Rxf3 Be8 12.Re7 Bxg6 13.Rxe6 Bh7 14.Re7 Be4 15.Rg3+ (591.871.128) 4384
22/67   3:43   +7.91   2.Qh5 b5 3.g4 Qc7 4.gxf5 Rxf5 5.Qxh6 Qg7 6.Qxg7+ Kxg7 7.Rag1 Bd7 8.Rh7+ Kg8 9.Ke2 Be8 10.Rgh1 Rxf3 11.Kxf3 Bxg6 12.Rh8+ Kg7 13.Rxa8 Be4+ 14.Kg3 Bxh1 15.Rxa7+ (971.959.264) 4357

r1b2rk1/p7/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R7 w - -


21/58   0:17   +15.20--  2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Qxf8 5.Rh7 Nh6 6.Qh5 a5 7.Rxh6 Qxh6+ 8.Qxh6 Ra7 9.Qg5 Rd7 10.Qf6 a4 11.Qxe6+ Kf8 12.Qxb6 Ke8 13.Qe6+ Kd8 14.Qf6+ Kc7 15.g7 (77.348.546) 4524
21/58   0:17   +14.19--  2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Qxf8 5.Rh7 Nh6 6.Qh5 a5 7.Rxh6 Qxh6+ 8.Qxh6 Ra7 9.Qg5 Rd7 10.Qf6 a4 11.Qxe6+ Kf8 12.Qxb6 Ke8 13.Qe6+ Kd8 14.Qf6+ Kc7 15.g7 (80.024.732) 4549
21/58   2:09   +17.23++  2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Qxf8 5.Rh7 Nh6 6.Qh5 a5 7.Rxh6 Qxh6+ 8.Qxh6 Ra7 9.Qg5 Rd7 10.Qf6 a4 11.Qxe6+ Kf8 12.Qxb6 Ke8 13.Qe6+ Kd8 14.Qf6+ Kc7 15.g7 (585.902.416) 4514
21/77   4:45   +17.87  2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Qxf8 5.Rh7 Nh6 6.Qh5 Qf4+ 7.Kd1 Rb8 8.Rxh6 Qxh6 9.Qxh6 Rb7 10.Qg5 Rd7 11.Qf6 Rb7 12.Qd8+ Kg7 13.Qxc8 Re7 14.Kd2 b5 15.Ng5 (1.274.832.449) 4472

The plan of capturing the Rook at f8 with the Bishop seems clearer.

Critter 1.4 Session File MultiPV 2 after Interactive Analysis:

22   0:58   +17.87  1.Rxh6 gxh6 2.Rh1 Qxa3 3.Bxh6 Qe7 4.Bxf8 Qxf8 5.Rh7 Nh6 6.Qh5 Rb8 7.Rxh6 Qg7 8.Rh7 Rb7 9.Rxg7+ Rxg7 10.Qg5 Rd7 11.Qf6 a5 12.Kd1 Ra7 13.Qd8+ Kg7 14.Kd2 (233.206.646) 3996
22   0:58   +7.91   1.Bxh6 gxh6 2.Qh5 b5 3.g4 Qc7 4.gxf5 Rxf5 5.Qxh6 Qg7 6.Qxg7+ Kxg7 7.Rag1 Bd7 8.Rh7+ Kg8 9.Ke2 Be8 10.Rgh1 Bxg6 11.Rh8+ Kg7 12.Rxa8 Bh5 13.Rxa7+ Kg8 14.Rg1+ (233.206.646) 3996

Thinks Rxh6 is about 10 pawns better at this depth.

Though, this is probably about the difference on which move mates some moves faster, so I agree with the thread title that it's a question of style.

Now, I wonder if +17.87 is close enough to solve it to mate...
Parent - - By Uly (Gold) [mx] Date 2012-03-23 04:38

> Now, I wonder if +17.87 is close enough to solve it to mate...


...doubtful.

[FEN "r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - -"]

1. Rxh6 gxh6 2. Rh1 Qa6 3. Bxh6

r1b2rk1/p7/qp2p1PB/3pPn2/2pP2Q1/P1P2N2/2PK1PP1/7R b - -


21/59   0:12   +43.51  3...Qb7 4.Bxf8 Kxf8 5.Rh8+ Ke7 6.g7 Kd7 7.g8Q Kc6 8.Qe8+ Bd7 9.Qxa8 Qxa8 10.Rxa8 a5 11.Qg6 Kb5 12.Ra7 Nd6 13.exd6 e5 14.Rxd7 Ka4 15.dxe5 Kxa3 16.e6 b5 (52.274.282) 4297
22/59   0:14   +43.51  3...Qb7 4.Bxf8 Kxf8 5.Rh8+ Ke7 6.g7 Kd7 7.g8Q Kc6 8.Qe8+ Bd7 9.Qxa8 Qxa8 10.Rxa8 a5 11.Qg6 Kb5 12.Ra7 Nd6 13.exd6 e5 14.Rxd7 Ka4 15.dxe5 Kxa3 16.e6 b5 (62.406.378) 4401
23/59   0:15   +43.51  3...Qb7 4.Bxf8 Kxf8 5.Rh8+ Ke7 6.g7 Kd7 7.g8Q Kc6 8.Qe8+ Bd7 9.Qxa8 Qxa8 10.Rxa8 a5 11.Qg6 Kb5 12.Ra7 Nd6 13.exd6 e5 14.Rxd7 Ka4 15.dxe5 Kxa3 16.e6 b5 (70.420.451) 4459
Parent - - By Pia (***) [ru] Date 2012-03-28 00:03
1. Rxh6 gives mate in 20.

1. Rxh6 gxh6 2. Rh1 b5 3. Bxh6 Qc7 4. Bxf8 Kxf8 5. Rh8+ Ke7 6. g7 Kd7 7. g8=Q
Kc6 8. Rh7 Qxh7 9. Qxh7 Bd7 10. Ng5 Re8 11. Nxe6 Bxe6 12. Qgg6 Re7 13. Qxe7
Nxe7 14. Qxe6+ Kb7 15. Qxe7+ Kb6 16. Qd6+ Kb7 17. e6 a6 18. e7 a5 19. e8=Q b4
20. Qeb8# 1-0
Parent - - By Uly (Gold) [mx] Date 2012-03-28 01:03
Nice. I believe you but I don't think it would be easy to show as black has many possible defenses.

I guess it could be solved on the fly by leaving a program like ChestUCI solve any black defense on demand?
Parent - By Pia (***) [ru] Date 2012-03-28 03:22
But you shouldn't. Jeez... Blacks were smarten than me and managed to check 19. bc+
Although line basically is the same, it's mate in 21.

I trained Spike to do the trick

Analysis by Spike 1.4:

1.Rh1xh6 g7xh6
  +-  (79.38)   Depth: 6   00:00:00  1kN
...
1.Rh1xh6 g7xh6
  +-  (79.38)   Depth: 28   00:00:12  49166kN
...
1.Rh1xh6 g7xh6
  +-  (#21)   Depth: 29   00:00:56  209mN
...
1.Rh1xh6 g7xh6
  +-  (#21)   Depth: 35   00:14:38  3110mN 
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r1b2rk1/p5p1/1p2p1Pp/q2pPn2/2pP2Q1/P1P1BN2/2PK1PP1/R6R w - - 0 1"]
[PlyCount "41"]

1. Rxh6 gxh6 2. Rh1 b5 3. Bxh6 Qc7 4. Bxf8 Kxf8 5. Rh8+ Ke7 6. g7 Kd7 7. g8=Q
Kc6 8. Rh7 Qxh7 9. Qxh7 Bd7 10. Ng5 Re8 11. Nxe6 Bxe6 12. Qgg6 Re7 13. Qxe7
Nxe7 14. Qxe6+ Kb7 15. Qxe7+ Kb6 16. Qd6+ Kb7 17. e6 a6 18. e7 b4 19. e8=Q
bxc3+ 20. Kxc3 a5 21. Qeb8# 1-0
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