Author: Georg v. Zimmermann
Date: 03:10:03 11/17/02
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Hi, The reason why this happens is black seems to be getting worse scores with increasing depths, so it uses the repetition to push the horizon away. I dont see it as problem of the hash table. When not using hash tables, couldnt the same thing happen ? Or do you want to use the hash table to _detect_ such a symptom ? Interesting idea.. Georg On November 16, 2002 at 17:28:46, Gerd Isenberg wrote: >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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