Author: Bernhard Bauer
Date: 01:44:01 11/21/03
Go up one level in this thread
On November 20, 2003 at 17:41:58, Gerd Isenberg wrote: >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 Isn't the second position a mate in 6? [D] 2k5/8/4r2p/5Qp1/8/6P1/3pqP1P/R5K1 w kind regards Bernhard
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