Author: Tord Romstad
Date: 12:18:13 07/16/04
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On July 16, 2004 at 14:52:35, Vasik Rajlich wrote: >On July 16, 2004 at 13:49:41, Tord Romstad wrote: > >>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 ... Depends on what kind of pruning you use it for. In fact, I was simplifying a bit when I wrote my previous post. I don't have a single such window, but several concentric windows centered around the last root score. The biggest windows are used for the most risky pruning tricks. Tord
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