Author: Stuart Cracraft
Date: 22:11:44 07/27/04
Go up one level in this thread
> >Play with the granularity of the search. If a pawn is worth 64 centipawns you >will do far less searches than 1000 centipawns. But then you lose resolution. >So the trick is to find a happy medium, I would guess. Done. I made a pawn 64 centipawns instead of 1000 millipawns. and got a tree reduction for the 30-position test of about 5.589% so it's on the outer fringes of what I've read in Schaffer's writings, there being 5-15% reduction. I wonder what the other tricks are. I cringe at going to fail-soft and having to give up PVS/NEGASCOUT. Googling around for MTD(f) is remarkably sparse as far as amount of practical examples are concerned. Here are the results. MTDF 64 centipawns to a pawn **** 90% 27/30 25.81 6492995 216433/1/251608 0/0/303344/0/0/0 MTDF 1000 millipawns to a pawn **** 90% 27/30 25.69 6640618 221354/1/258440 0/0/307973/0/0/0 PVSNEGASCOUT 1000 millipawns to a pawn **** 90% 27/30 25.56 6877388 229246/1/269110 0/0/316245/0/0/0 Tree size reduced from 6,877,388 nodes to 6,492,995 nodes. Stuart
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