Author: Uri Blass
Date: 13:43:25 04/04/04
Go up one level in this thread
On April 04, 2004 at 15:55:31, Uri Blass wrote: >On April 04, 2004 at 14:08:49, Robert Hyatt wrote: > >>On April 04, 2004 at 08:52:41, Eduard Nemeth wrote: >> >>>Endgame Testpostition >>> >>>The Game: >>> >>>[Event "4NCL West Bromwich ENG"] >>>[Site "?"] >>>[Date "2004.??.??"] >>>[Round "5"] >>>[White "Collinson, A."] >>>[Black "King, D."] >>>[Result "0-1"] >>>[ECO "B50"] >>>[WhiteElo "2390"] >>>[BlackElo "2495"] >>>[PlyCount "105"] >>>[EventDate "2004.??.??"] >>> >>>1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Bd3 Nc6 5. Bc2 Bg4 6. d3 e6 7. Nbd2 Be7 8. h3 >>>Bh5 9. Nf1 d5 10. Ng3 Bg6 11. Qe2 Qc7 12. Bg5 O-O-O 13. e5 Nh5 14. Bxe7 Qxe7 >>>15. Nxh5 Bxh5 16. g4 Bg6 17. O-O-O d4 18. c4 h5 19. a3 Qc7 20. Rde1 hxg4 21. >>>hxg4 Rxh1 22. Rxh1 a6 23. Ba4 Ne7 24. Nd2 b5 25. Bc2 Qb7 26. Rh2 Kc7 27. f4 Rb8 >>>28. Qf3 Qxf3 29. Nxf3 Nc6 30. b3 Rf8 31. Nh4 Rh8 32. Kd2 f6 33. exf6 gxf6 34. >>>Nf3 Rxh2+ 35. Nxh2 b4 36. a4 f5 37. Bd1 Kd6 38. Nf1 e5 39. gxf5 Bxf5 40. Ng3 >>>Ke6 41. Bf3 Na5 42. Bd5+ Kf6 43. fxe5+ Kxe5 44. Kc2 Kf4 45. Nxf5 Kxf5 46. Be4+ >>>Kf4 47. Bg2 Ke3 48. Be4 Ke2 49. Bg2 Nxb3 50. Bb7 Na1+ 51. Kb2 a5 52. Be4 Kd2 >>>53. Kxa1 0-1 >>> >>>After move 49 white: >>> >>>Collinson,A - King,D >>> >>> >>>[D]8/8/p7/n1p5/PpPp4/1P1P4/2K1k1B1/8 b - - 0 1 >>> >>>Nxb3! >>> >>>Great move by D. King. >>> >>> Eduard. >> >> >>I don't believe this is a tough computer position. crafty finds this and sticks >>with it after .12 seconds... > >I think that it is dependent on evaluation. > >There are programs that certainly have problems with that position including my >program. >The problem is wrong evaluation of pawn endgames or wrong evaluation of passed >pawns. > >It seems to me based on looking at analysis of movei that the problem is wrong >evaluation of pawn endgames. > >Uri It seems that Crafty also has a problem and the score drops to 0.00 if you get depth 20 Here is some analysis by Crafty19.11 under chessbase(note that it is possible that you will get different results with more tablebases but it is not that crafty has superior knowledge) New game 8/8/p7/n1p5/PpPp4/1P1P4/2K1k1B1/8 b - - 0 1 Analysis by Crafty 19.11: 1...Nxb3 µ (-1.32) Depth: 1/4 00:00:00 1...Nxb3 2.Bf1+ Kxf1 3.Kxb3 µ (-0.87) Depth: 2/4 00:00:00 1...Nxb3 2.Bf1+ Kxf1 3.Kxb3 µ (-0.87) Depth: 3/6 00:00:00 1...Nxb3 2.Bf1+ Kxf1 3.Kxb3 Ke2 µ (-1.17) Depth: 4/7 00:00:00 1...Nxb3 2.Kxb3 Kxd3 3.Bd5 Kd2 µ (-1.29) Depth: 5/9 00:00:00 1...Nxb3 2.Kxb3 Kxd3 3.Bb7 a5 4.Bd5 µ (-1.25) Depth: 6/10 00:00:00 2kN 1...Nxb3 2.Kxb3 Kxd3 3.Bb7 a5 4.Bf3 Ke3 µ (-1.31) Depth: 7/10 00:00:00 4kN 1...Nxb3 2.Kxb3 a5 3.Be4 Ke3 4.Bh7 Kd2 5.Be4 +- (1.97) Depth: 8/11 00:00:00 7kN 1...Ke3 2.Be4 Kf2 3.Kb2 Ke2 4.Ka2 Kd2 5.Kb2 = (0.17) Depth: 8/11 00:00:00 13kN 1...Ke3 2.Be4 Kf2 3.Kb2 Ke2 4.Ka2 Kd2 5.Kb2 Ke3 ² (0.27) Depth: 9/12 00:00:00 18kN 1...Nxb3 = (-0.23) Depth: 9/12 00:00:00 26kN 1...Nxb3 2.Kxb3 Kxd3 3.Bb7 a5 4.Bd5 Kd2 5.Be4 -+ (-1.55) Depth: 9/12 00:00:00 35kN 1...Nxb3 2.Kxb3 Kxd3 3.Bb7 a5 4.Bd5 Kd2 5.Bf3 d3 6.Be4 -+ (-1.55) Depth: 10/15 00:00:00 46kN 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.Bh3 d3 5.Bf5 Ke3 6.Bxd3 Kxd3 -+ (-1.70) Depth: 11/16 00:00:00 85kN 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.a5 d3 5.Kb2 Ke3 6.Bxd3 Kxd3 7.Kb3 -+ (-1.70) Depth: 12/20 00:00:00 143kN, tb=2 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.Bh3 d3 5.Bf5 a5 6.Kb2 Ke3 7.Bxd3 Kxd3 8.Kb3 -+ (-1.76) Depth: 13/23 00:00:01 284kN, tb=2 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.Bh3 d3 5.Bf5 a5 6.Kb2 Ke3 7.Bxd3 Kxd3 8.Kb3 Kd4 -+ (-1.76) Depth: 14/23 00:00:01 541kN, tb=6 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.Bh3 d3 5.Bf5 a5 6.Kb2 Ke3 7.Bxd3 Kxd3 8.Kb3 Kd4 -+ (-2.16) Depth: 15/25 00:00:03 1346kN, tb=40 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.a5 d3 5.Kb2 Ke3 6.Bxd3 Kxd3 7.Kb3 Kd2 8.Kb2 Ke3 9.Kb3 Kd3 -+ (-1.70) Depth: 16/30 00:00:05 2415kN, tb=61 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.a5 d3 5.Bxd3 Kxd3 6.Ka4 Kd2 7.Kb3 Ke3 8.Kc2 Ke2 9.Kb3 Kd2 10.Ka4 -+ (-1.90) Depth: 17/30 00:00:08 4731kN, tb=149 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.a5 d3 5.Kb2 Ke3 6.Bh3 Kf2 7.Bg4 Ke1 8.Bf5 d2 9.Bg4 -+ (-1.80) Depth: 18/34 00:00:14 8139kN, tb=265 1...Nxb3 2.Kxb3 Kxd3 3.Bf1+ Kd2 4.a5 d3 5.Kb2 Ke3 6.Bh3 Kf2 7.Bg4 Ke1 8.Bf5 Ke2 -+ (-1.80) Depth: 19/34 00:00:27 14842kN, tb=654 1...Nxb3 2.Kxb3 Kxd3 3.a5 Ke3 4.Kb2 d3 5.Bh3 Kf2 6.Bg4 Ke3 7.Bh3 = (0.00) Depth: 20/36 00:00:47 26214kN, tb=1202 1...Ke3 2.Be4 Kf2 3.Kb2 Kg3 4.Kc2 Kf4 5.Kb2 Ke5 6.Bd5 Kd6 7.Ka2 Nc6 8.Kb2 Ne5 9.Kc2 a5 10.Be4 Nc6 11.Bd5 = (-0.17) Depth: 20/36 00:01:54 69295kN, tb=1551 1...Ke3 2.Be4 Kf4 3.Kb2 Ke5 4.Bd5 Kd6 5.Ka2 Kc7 6.Kb2 Kc8 7.Ka2 Kd7 8.Bf7 Nc6 9.Bg6 a5 10.Be4 Kc7 11.Bd5 Kb6 = (-0.17) Depth: 21/38 00:02:57 109216kN, tb=2516 (Blass, Tel-Aviv 04.04.2004)
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