Author: Peter McKenzie
Date: 20:31:31 11/25/98
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On November 25, 1998 at 18:32:27, Jon Dart wrote: >In a recent game, my program (White) reached this position: > >5b2/5P2/p7/5P2/P7/2k5/8/1K6/ w > >White is a pawn down and the passer is firmly blocked. A >little search will reveal that White is going to lose the >advanced pawns. But I am curious about Crafty's eval here >(this is crafty 15.18): > >White(1): setboard 5b2/5P2/p7/5P2/P7/2k5/8/1K6/ w >White(1): score >end-game phase > clearing hash tables >note: scores are for the white side >material evaluation................. -1.00 >development......................... 0.00 >pawn evaluation..................... 0.55 >passed pawn evaluation.............. -0.10 >passed pawn race evaluation......... 0.00 >interactive piece evaluation........ -1.40 >total evaluation.................... -1.95 >White(1): execution complete. > >I don't really see how the passed pawn eval >gets to be negative, or where the "interactive Yeah, thats kind of weird. Guess there is a big penalty for the pawns being blocked. >piece evaluation" gets to be -1.40. Clearly >Crafty realizes statically that White is in >trouble here, but I'm having difficulty looking >at the source and seeing what eval terms are >kicking in. > >Also, I'd be interested to see what score other >programs give here. LambChop gives a static evaluation of -0.39 pawns for this position, the white passed pawns help the white eval. I think this score should be more favourable for black, but I'm not penalising white for having blocked passed pawns. On the other hand, I'm giving the white bishop's mobility a big bonus... What was Arasan's static eval? > >--Jon Peter
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