Author: Vasik Rajlich
Date: 11:52:35 07/16/04
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On July 16, 2004 at 13:49:41, Tord Romstad wrote: >On July 16, 2004 at 13:40:52, Vasik Rajlich wrote: > >>On July 16, 2004 at 12:13:25, Fabien Letouzey wrote: >> >>>As for the "true bounds", Tord mentionned that he used some form of "aspiration" >>>together with MTD(f). The guess part of aspiration can obviously be applied to >>>any algorithm and he makes some decisions during the search depending on those >>>values. So I am not sure about the "decisive advantage" although I don't like >>>the idea of MTD(f) at all. >> >>Maybe Tord found something interesting. In MTD (f) you do have root aspiration >>values, but these don't seem that useful. > >The idea is not mine; I learnt it from Andrew. At the beginning of each >iteration, I assume that the score will end up within a window of +- 2 pawns >centered around the result of the previous iteration. I use this window >as a basis for pruning decisions. When it turns out that the score is >likely to end up outside the window, I clear the hash table and restart >the iteration with most speculative pruning tricks disabled. > >Tord Aha, thanks. Although that seems very wide ... Vas
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