Author: Steve Maughan
Date: 04:13:23 06/06/05
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Andrew, One technique which could adds some value is to never do a hash cut-off at a PV node (i.e. when alpha != beta - 1); and start to pull the evaluation closer to a draw score when evaluating i.e. taking the 50 move rule into account. Since there will not be a hash cutoff at a PV node, the PV and it's score will not be polluted by the invalid hash scores. One effect may be a somewhat unstable search i.e. the PV score may start to approach zero and you may get quite a few fail highs for other moves that fail low on a research but this is probably a price worth paying. Steve
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