Author: Andrew Williams
Date: 11:06:18 11/13/01
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On November 13, 2001 at 13:41:42, Gian-Carlo Pascutto wrote: >On November 13, 2001 at 13:30:40, Andrew Williams wrote: > >>SCRUBBING TT (on new guess): -148 [-193] 252 > >Just curious, what exactly happens here? > >At a guess, you determine that because of a fail-low >your move ordering info is worthless and hence clear >the hash or something? > >-- >GCP Oops. Meant to delete that. For many forward pruning decisions, PM relies on the external bounds that have been established by the MTDf loop. PM sets an artificial external upper and lower bound of prevscore+200 and prevscore-200. The message means that a new guess in the MTD(f) loop was outside these artificial bounds and PM is going to try again with proper bounds (-100000 .. +100000). In these situations, I ditch the score information from the hash table (scrubbing rather than clearing in PM's terms). Andrew
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