Author: Leen Ammeraal
Date: 04:26:28 03/05/01
I understand that it is usual to have at most one entry in a hashtable for a given position. Clearly, an entry with a higher (depth) draft should replace one with a lower draft, while a new candidate with a lower draft should be ignored. Therefore, in the rest of this discussion, let us assume that the draft of the existing entry is equal to that of the entry that may replace the older one. It seems clear to me that a tighter bound (higher value in the case of LOWER and a lower value in the case of UPPER) should have precedence. If a lower bound has been stored and the new candidate is an upper bound with the same score, then I replace the LOWER flag with the EXACT flag. The situation is similar with lower and upper exchanged in the last sentence. But what if these scores are unequal? Is a lower bound more valuable than an upper bound, or is it the other way round? Remember, we are talking about equal draft, unequal scores and one flag being LOWER and the other UPPER. Leen
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