Author: Gerd Isenberg
Date: 02:32:37 11/21/03
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On November 21, 2003 at 04:44:01, Bernhard Bauer wrote: >Isn't the second position a mate in 6? >[D] 2k5/8/4r2p/5Qp1/8/6P1/3pqP1P/R5K1 w >kind regards >Bernhard Hi Bernhard, yes the second of the reply to John, i meant the second of the initial post, sorry for confusion. 2k5/8/4r2p/3p1Qp1/8/6P1/3pqP1P/R5K1 w - - ; (1) draw 2k5/8/3pr2p/5Qp1/8/6P1/3pqP1P/R5K1 w - - ; (2) mate in 13 2k5/3p4/4r2p/5Qp1/8/6P1/3pqP1P/R5K1 w - - ; (3) draw 2k5/8/4r2p/5Qp1/3p4/6P1/3pqP1P/R5K1 w - - ; (4) mate in 6 2k5/8/4r2p/5Qp1/8/6P1/3pqP1P/R5K1 w - - ; (5) mate in 6 In 2,4,5 there is no safe zwischenzug to ward off a possible queen check on c2. In (1) c4 is double defended by pawn and queen. In (3) c6 is double defended by pawn and rook. So beside pawn shield evaluation one additional, conditional king safety term (in these endings) may be: 1. Look for safe checking target squares of sliding pieces (a8, f8 and c2 here). 2. Look for (proteceted) "ward off" squares on these direct check trajectories. The number of "none defended" check trajectories decreases the king safety. Whether it is worth to implement such features is another question and it depends on the infrastructure of the program. Cheers, Gerd
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