Author: Anthony Cozzie
Date: 18:22:56 12/16/03
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. anthony
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