Author: Rafael Andrist
Date: 11:15:43 10/14/01
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If an underpromotion is clearly worse than the promotion to a queen, this line will be pruned anyway (Nullmove+AlphaBeta). Problems are IMO only these cases, where the score of the promotions is nearly equal (mostly because the promoted piece can be captured, as in example given by Eduard). So it is sufficient to include a rule like: if all promotions have (nearly) equal scores, prefer the promotion to a queen (or to the piece with the highest value from the ones with equal score). Rafael B. Andrist
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