Author: Ricardo Gibert
Date: 09:41:25 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: > >[D]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. > [snip] White is winning by just a tempo. If it were Black to move, Black would be winning. To get an even better idea of just how delicate a matter it would be to create eval code to catch this, compare the following similar positions: [D]5k2/7K/6P1/p4p2/P6P/P1b5/8/8 w - - 0 0 Which draws. [D]5k2/7K/6P1/1p6/7P/2b5/8/8 w - - 0 0 Which loses for White.
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