Author: Gerd Isenberg
Date: 14:41:58 11/20/03
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On November 20, 2003 at 16:07:56, John Merlino wrote: >On November 20, 2003 at 15:20:59, Gerd Isenberg wrote: > >>Three Positions, one is mate in 13 (Shredder - IsiChess WMCCC02). >>Any static eval or king safety heuristic to choose the best one for white if >>leaf nodes ;-) ? >> >>[D] 2k5/8/4r2p/3p1Qp1/8/6P1/3pqP1P/R5K1 w - - >>[D] 2k5/8/3pr2p/5Qp1/8/6P1/3pqP1P/R5K1 w - - >>[D] 2k5/3p4/4r2p/5Qp1/8/6P1/3pqP1P/R5K1 w - - >> >>Cheers, >>Gerd > >Chessmaster 9000 evaluates the first and third one as draws in brief analysis. >The second one gets a Mate in 13 announcement in one second on a P4-2.4.... > >jm IsiChess takes 7 seconds more to find the mate in 13 (Athlon XP 2.6++). I am more interested in static eval scores of the three positions ;-) King safety and passed pawn eval, huge volatility, at least some static pattern to trigger checks in quiescence. But i guess only Johan knows... Ok, there are no defending black rook controls in front the king, two ranks below, to ward off possible checks. But that's obviously not enaugh, there must be at least one double defending control on that file (pawn-rook c6, or pawn-queen c4) between king and possible check targets on that file (c1,c2). [D] 2k5/8/4r2p/5Qp1/3p4/6P1/3pqP1P/R5K1 w - - [D] 2k5/8/4r2p/5Qp1/8/6P1/3pqP1P/R5K1 w - - It's even interesting to rotate the initial mate in 13 position with pawn on d6 horizontally and to look for some attack and defence pattern. Not in the sense to give decisive eval scores like static mate evaluator of course. But the abilty to more or less "safely" ward off possible sliding checks should probably increase the already "penalized" safety of the black king. Gerd
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