Author: William Bryant
Date: 19:49:03 06/05/00
Go up one level in this thread
On June 05, 2000 at 08:22:44, Steffen Jakob wrote: >Hi! > >This is a position from an interesting standard game MissSilicon - Hossa, played >today at ICC: > >5k2/7K/6P1/1p3p2/1P5P/1Pb5/8/8 w > >White is obviously winning. The static evaluation of this position of my program >is totally wrong because Hossa thinks that the pawn f5 is running. Even after >some improvements Hossa needs 8 plies to see a positive score! > > depth value time nodes pv > 1 -6.07 0.00 3 1.g7 c3xg7 > 2/1 -3.62 0.00 6 1.h5 c3xb4 > <1> -3.62 0.00 7 1.h5 c3xb4 > 2 -3.62 0.00 24 1.h5 c3xb4 > <2> -3.62 0.00 40 1.h5 c3xb4 >! 3 -1.77 0.01 544 1.h5 f4 2.h6 c3xb4 >! <3> -1.77 0.01 551 1.h5 f4 2.h6 c3xb4 > 4 -1.87 0.03 1214 1.h5 f4 2.h6 f8e8 3.h7g8 c3xb4 > <4> -1.87 0.03 1245 1.h5 f4 2.h6 f8e8 3.h7g8 c3xb4 > 5 -1.67 0.05 2303 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 > <5> -1.67 0.05 2375 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 > 6 -1.81 0.09 4316 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4 > <6> -1.81 0.09 4691 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4 > 7 -1.81 0.20 9875 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4 > <7> -1.81 0.21 10423 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4 >! 8 0.76 0.61 31734 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8 > 4.h6g5 >! <8> 0.76 0.61 31775 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8 > 4.h6g5 >! 9 2.19 0.85 47414 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8 > 4.h6g5 g8f8 5.g5xf5 >! <9> 2.19 0.85 47456 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8 > 4.h6g5 g8f8 5.g5xf5 > > >Does your engine perform better here? Any ideas how to handle such positions? > >Best wishes, >Steffen. > Screamer picks h5 on ply 5, with a positive score by ply 6. I have _very_ little endgame evaluation code so this is just searching. I like Bob's comment about being more concerned with how long it takes to find the move rather than how deep it takes to get a positive score. William wbryant@ix.netcom.com New Board Position 5k2/7K/6P1/1p3p2/1P5P/1Pb5/8/8 w Move 1 W>> PLY NODES TIME SCORE PV __________________________________________________ 5/00 1984 0.029 -0.76 Kh6 Bxb4 g7+ Kg8 h5 f4 5/01 2956 0.085 ++ h5 5/01 3483 0.116 -0.13 h5 f4 h6 Ke7 g7 6/00 4793 0.159 ++ h5 6/00 6586 0.208 +0.65 h5 Ke7 g7 Bxg7 Kxg7 f4 h6 7/00 9517 0.277 +1.00 h5 Bg7 h6 Bxh6 Kxh6 f4 g7+ Kf7 Kg5 Kxg7 Kxf4 8/00 13018 0.351 +1.08 h5 Bg7 h6 Bxh6 Kxh6 f4 g7+ Kg8 Kg6 f3 9/00 18622 0.449 ++ h5 9/00 48252 0.925 +2.88 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 Kf8 Kxf5 Ke7 10/00 54925 1.033 +2.98 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 Kf8 Kxf5 Kg7 Kg5 11/00 63323 1.159 +2.88 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 Kg7 Kxf5 Kh6 Kf6 Kh5 12/00 82246 1.408 +3.08 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg7 Kf5 13/00 116037 1.824 +3.10 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg7 Kf5 Kh6 14/00 144631 2.181 +3.08 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Kf5 Kg7 Kg5 Kf8 Kf4 15/00 191010 2.729 +3.08 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg7 Kf5 Kf8 Ke6 Kg7 16/00 261528 3.551 +3.08 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg8 Kf5 Kg7 Kg5 Kf8 Kf4 17/00 508336 6.696 +3.10 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg8 Ke5 Kg7 Kf5 18/00 691540 8.985 +3.10 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg8 Ke5 Kg7 Kf5 Kf8 Kf4 Ke7 g7 19/00 1045871 13.578 +3.10 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg8 Ke5 Kg7 Kf5 Kg8 Kg5 Kg7 Kf5 20/00 1877760 24.343 +3.08 h5 Bg7 h6 Bxh6 Kxh6 Kg8 Kg5 f4 Kxf4 Kh8 Ke4 Kg8 Ke5 Kg7 Kf5 Kg8 Kf6 Kh8 Ke6 Kg7 Kf5
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