Author: Yuriy Lyapko
Date: 01:52:56 12/08/05
Go up one level in this thread
On December 07, 2005 at 18:09:38, George Tsavdaris wrote:
>
>Rybka with black outplayed Toga II 1.1 and reached a position that is a CLEAR
>win.
>It's not an endgame with few pieces that is known Rybka has some weakness to
>mate, but the weakness this time is that Rybka didn't managed to win with a
>Bishop more and an easy position to play.....
>
> The easiest win would be to capture the Knight here but Rybka didn't. This is
>not a mistake as the game is won anyway easily! But Rybka failed as the 50-moves
>rule applied........
>[D]8/5k2/4p1pp/8/1bbPP3/6P1/4NK2/8 b - - 0 45
>
Seems to be another proof that Rybka lacks some basic endgame knowledge.
It's easy to fix for programmer as it doesn't affect other aspects of play.
In this position it doesn't want to trade down to a winning endgame:
[Event "Computer chess game"]
[Site "LYAPKO"]
[Date "2005.12.08"]
[Round "-"]
[White "lyapkyur"]
[Black "Rybka 1.0 Beta 32-bit"]
[Result "1/2-1/2"]
[TimeControl "60+2"]
[FEN "8/5k2/4p1pp/8/1bbPP3/6P1/4NK2/8 b - - 0 1"]
[SetUp "1"]
{--------------
. . . . . . . .
. . . . . k . .
. . . . p . p p
. . . . . . . .
. b b P P . . .
. . . . . . P .
. . . . N K . .
. . . . . . . .
black to play
--------------}
1... Kf6 2. Nf4 g5 3. Nh5+ Kg6 4. g4 Kf7 5. e5 Ba5 6. Nf6 Bb6 7. Ke3 Bc7 8.
Ke4 Bd8 9. Nh5 Kg6 10. Ke3 Bb3 11. Kd2 Bd5 12. Ke3 Bc6 13. Kf2 Bc7 14. Nf6
Bb6 15. Ke3 Kf7 16. Nh5 Bc7 17. Nf6 Bb7 18. Nh5 Bd5 19. Nf6 Bc6 20. Nh5 Bh1
21. Nf6 Ba8 22. Nh5 Bd8 23. Kf2 Bb6 24. Ke3 Bc7 25. Nf6 Ba5 26. Nh5 Bc6 27.
Nf6 Bd8 28. Nh5 Bb6 29. Nf6 Bg2 30. Nh5 Bd8 31. Kf2 Ba8 32. Ke3 Bc6 33. Kf2
Be7 34. Ke3 Kg6 35. Kf2 Bb4 36. Ke3 Kf7 37. Nf6 Ba5 38. Kf2 Ke7 39. Ke3 Bd8
40. Nh5 Bc7 41. Kf2 Ba5 42. Ke3 Bb6 43. Nf6 Bb7 44. Nh5 Bc7 45. Nf6 Bg2 46.
Kf2 Bh1 47. Ke3 Bb7 48. Nh5 Bb6 49. Nf6 Bc6 50. Nh5 Bd8 51. Nf6 Kf8 52. Nh5
Kg8 53. Kf2 Bh1 54. Ke3 Kh7 55. Kf2
{Draw by fifty-move rule} 1/2-1/2
About Rybka's endgame strength: in my tests on cleaned MES testsuit(1082pos) it
is currently only at place 37 with 907 solved pos (which is even lower than
29.Bestia097-916).
First 12 looks like:
1.Toga II 1.1a 993
2.Yace 0.99.87+EGTB 990
3.Gambit Fruit 1.0 Beta 4bx 984
Yace 0.99.87 979*
Gambit Fruit 1.0 Beta 2 977*
Toga II 1.0 972*
4.Fruit 2.1 970
Fruit 2.0 966*
5.Spike 1.0a Mainz+EGTB 961
Toga II 0.93 959*
6.Delfi 4.6 958
7.Ruffian 1.0.5+EGTB 949
7.E.T.Chess 18.11.05 949
9.Naum 1.71 948
9.Pharaon 3.3+EGTB 948
11.TRACE 1.35+EGTB 947
12.Pepito v1.59+EGTB 946
Naum 1.8 946*
Naum 1.71+EGTB 946*
Best regards,
George
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