Author: José Carlos
Date: 12:10:57 12/01/99
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>Maybe here is the problem: >I once searched the position with a fixed alpha-beta window and got a fail low >and stored the value. >Now i come back to this position with an other alpha-beta window. The stored >value is lower than alpha, so I use it. (the problem!) >Can this be incorrect? Can with this new alpha-beta window come out a value in >the search, which is not a fail low, cause some beta-cutoffs are handled another >way deeper in the search? > >Werner Hi Werner! If I'm not sure if I understand what you call "the problem". This is what I think: a fail-low implies that the returned value is an upper bound for the "real value". So, if I reach this position with a different ABWindow, if the value stored in the hash table is below the new Alfa, it is perfectly valid for failing low again, since the real value _is_ surely below it. José C.
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