Author: Dann Corbit
Date: 18:53:59 12/16/03
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On December 16, 2003 at 21:22:56, Anthony Cozzie wrote: >Recently I experimented with adding MTD(F) into Zappa. It has been an >interesting experiment, but I am going back to PVS(). > >I thought that since Zappa has a [UL,LL] paired transposition table and an >evaluation granularity of only 1/100 of a pawn, MTD(f) would work quite well, >but that does not seem to be the case. The MTD(f) version of Zappa does >slightly better on test suites (113/183 @ecmgcp v 106 @ 10s/move) but in the >positional test suites it averaged about 3/4 of a ply less than the PVS() >version. My guess is that because MTD(F) tries all moves, some of the >"ridiculously losing captures" ordered near the end by PVS() are tried earlier, >which accounts for the increased test suite performance. > >If anyone has any suggestions, I'm keeping the MTD(F) code in Zappa (just turned >off) and I'm willing to try anything. Here is an interesting experiment: Try searching with a granularity of 1/10 of a pawn instead of 1/100 for all moves except the pv. The number of searches in MTD(f) is essentially the log of the resolution in bits of the search window.
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