Author: Gerd Isenberg
Date: 14:28:46 11/16/02
Hi all, in this position from Virtual - IsiChess, WMCC99 Paderborn, i noticed probably an path history effect with IsiChessMMX: [D] r3k2r/1q3ppp/p3p3/6P1/1n2pP2/2P5/1P4QP/1R2KB1R b Kkq - At depth 11 following PV occured: 1.. Rd8 2.cxb4 Qxb4+ 3.Kf2 Qd2+ 4.Kg3 Qe3+ 5.Kh4 h6 6.g6 Qxf4+ 7.Qg4 Qxg4+ 8.Kxg4 f5+ 9.Kf4 with this final position: [D] 3rk2r/6p1/p3p1Pp/5p2/4pK2/8/1P5P/1R3B1R b k - At depth 13 a longer PV came up with the same score and the same final position. I guess it was a true score hit from the hashtable from the iteration two plies before. Instead of 7...Qxg4+ there were two delaying checks before the queen exchange took place. Is it worth to consider and store the distance to root into an hashtable entry? But what to do in case of true scores with appropriate drafts, if the stored root distance is less the current? Comments welcome. Thanks, Gerd
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