Author: blass uri
Date: 22:04:37 06/05/00
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On June 05, 2000 at 22:49:03, William Bryant wrote: >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 This line proves that Screamer has a positive score for the wrong reason. This line is losing for white because the f3 pawn cannot be stopped but screamer does not know to evaluate unstoppable passed pawns. Uri
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