Author: Sergei S. Markoff
Date: 21:47:14 09/25/04
Go up one level in this thread
>I would be unsure about possibly returning incorrect score >= beta in the > first stage. Sometimes it happens because of the change of values of the root bounds. In a root we have (in classic scheme of course) exact score for the best move. Near the zugzwang positions happens one thing. Some move fails high because of null-move cutoff. And we doing re-search with more wide window. In this case the zugzwang will be avoided using method, inroduced by me. >will not work well with score <= beta logic, whatever beta may be. Also depth >differences in nodes vastly affect the score, whether null move or not. The depth diffenences will be in most cases compensated by window width between null move score and best move score. Anyway the error will be only if a score delta is not in a bounds of this window + root aspiration window. Is it need to explain this? Is the case too often? We need experiments.
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