Author: José Carlos
Date: 05:28:50 08/13/01
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On August 13, 2001 at 07:53:22, Harald Faber wrote: >On August 13, 2001 at 07:14:48, Gian-Carlo Pascutto wrote: > >>On August 13, 2001 at 04:45:37, Harald Faber wrote: >> >>>And what makes me wonder is that how can Shredder say +0.2 at d=10/11/12 when >>>directly after Rxb3 Shredder only needs d=8 to see the disaster. >> >>Just simple nullmove I think. >> >>-- >>GCP > >I thought nullmove only fails in Zugzwang positions?! If so, nullmove would be almost perfect :) Null move reduces the search depth a lot, so it hides threats where material sacs are involved. Remember that with nullmove one side moves twice to a short depth, so it cuts variations where the side moving twice is down in material and his threats are too deep. In this case, it could also be a case of extensions. In the second search, it can fire some extensions that didn't get fired in the first. How? for example, if you do extensions based on search bounds, or in eval (preprocessing gives different evals for the two searches). There can be many reasons. I'd say this is a perfectly normal behaviour. José C.
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