Author: Ernst A. Heinz
Date: 10:51:19 12/14/00
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Hi Steve, >1) Back up the hash score with the returned value as the bound and NOT alpha or >beta. This would give more hash cutoffs but is it accurate when one has null >move & futility pruning etc? Many people (myself included) use it this way and obviously deem it accurate enough to work well in practice. However, I always like to mention one caveat with respect to this -- namely, properly respect all bounds on scores as produced by earlier searches with sufficient depths (i.e., hashed drafts) when returning the final result value. See the electronically available preprints of my publications on http://supertech.lcs.mit.edu/~heinz/ for details. =Ernst=
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