Author: Ernst A. Heinz
Date: 18:38:12 01/08/01
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Hi Severi, >1.If I prune a move in normal search: if(material+gain(move)+FMARGIN<=alpha) >what should I assign to the best score so far? Material+gain, material+FMARGIN, >material+gain+FMARGIN or material only? Now I'm using material+FMARGIN but it >can't be right. As described in my texts about extended futility pruning, "DarkThought" (http://supertech.lcs.mit.edu/~heinz/dt/) initializes the best score so far with: "mat_balance(node) + <margin>" for normal and extended futility pruning as well as limited razoring. This provides a reasonable fall-back if all moves get pruned or all non-futile moves fail low. You could possibly improve on the value by adding the max. material gain of all futile captures. =Ernst=
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