Author: Sergei S. Markoff
Date: 14:38:00 02/01/03
Hello All! False hash probes in endgames is well known problem of the classical search scheme. Same position can be the result of move chains which has a different lengths. It causes the misevaluation because of the 50 moves rule. The one idea is to use some multiplier N when evaluating position in which 50-moves rule counter is large. Fur example when this counter shows 50 plies we can multiply evaluation onto 0.6 (or other value <1). Also we'll try to save 50-moves rule counter in hash entry and use this value to recalculate hash evaluation. I'm not implement this scheme at present but I'll try it in future. Are you tried it? Or you have other non-secret approaches? I see that Ruffian is safely avoiding this problem (see exact Ruffian evaluation in some positions, which is, I think, not based on knowledge, for example: black: kh1, ph2, ka7; white: kf1, wtm) (Fritz7 also shows 0.00, but immediately, I think it's because of specific knowledge). Sincerelly yours, Sergei
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