Author: Jaime Benito de Valle Ruiz
Date: 15:48:09 12/26/03
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On December 26, 2003 at 18:10:51, Jim Monaghan wrote: >In this study: > >[D]8/5B2/4P3/8/8/4k1p1/6P1/3b3K w - - 0 1 > >There are stalemate and underpromotion themes. >First off, 1.Kg1? allows 1...Bb3 pinning the e-pawn. >Also, 1.e7? Kf2 2.e8=Q Bf3 3.Bd5 Bxg2+ 4.Bxg2 stalemate. >The right way is 1.Be8! Kf2 2.Bc6 Be2 3.e7 Bf1 4.e8=N! and White wins by >bringing his knight to e4. > >My question is that both Ruffian and Crafty perfer 4.e8=B? both giving high >scores. Yace gets it right with the knight underpromotion. Obviously with >4.e8=B, 4...Bxg2+ is a draw. I don't have tablebases installed on this PC. >Anyone know what's going on? Why no contempt factor for bishops of the same >colour? > >Jim I'm not 100% sure, but probably both value bishops slightly higher than knights, and maybe they even give a reward for "a bishop pair". Silly at it may sound, not all programs consider the case of bishop of the same color. Ruffian seems to be given about 1/4 of pawn more value to an extra bishop rather than a knight. The positive score you get it's due to the material advantage. Jaime
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