Computer Chess Club Archives




Subject: Re: MTD(f) and hash table size

Author: Dieter Buerssner

Date: 13:24:24 08/17/03

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Dan, did you also try with 2 bounds/scores per entry? I think, 2 bounds per
entry could make a depth preferred scheme looking more attractive.

I try to give another reason, why replace always should be preferred. Assume the
situation you have one pos with high draft (more than search depth), but you
need to search the position. The only reason can be, that the TT entry has the
wrong bound (otherwise you would cutoff, and not search). Now you search to end,
and try to store in the TT. With depth preferred, you will not store it (after
all, the pos had a high draft in the beginning). You will keep that "wrong"
bound, that is basically useless now (but has an attractive looking draft).


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