Author: Dan Newman
Date: 13:19:44 10/09/00
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On October 09, 2000 at 09:24:08, Steve Maughan wrote: >OK so here’s a middlegame position - nothing special. It’s actually AnMon v >Ikarus the games move was Rd2 but there doesn’t seem to be too many tactics >flying about. > >[d]r1br2k1/1pq2pbp/2p3p1/p1n5/2NN4/4P1P1/PPR1BPP1/3Q1RK1 w - - 0 21 > >So my program (it has no name) takes 70 seconds and uses 17,059,562 nodes to >complete the _eighth_ ply. There are also only 3.3% of nodes where there are a >hash hit – a bit low maybe? > >Other programs: > >Faile 56 secs and ~4,600 kn >Crafty 17.11 9 secs and ~1,500 kn >Ikarus 22 secs and ~2,900 kn >Goliath Light 8 secs and 1,800 kn >HIARCS 7.32 36 secs and 1,692 kn >Nimzo 7.32 6 secs and ~1,700 kn >ExChess 3.11 9 secs and ~1,200 kn > >Clearly there is something wrong with my program or is this what one would >expect from a young vanilla alpha / beta? > >Steve Maughan Mine (Shrike) is doing this in just under 3s (1.27M nodes) on a P3/600. It's getting about a 35% hit rate on the hash table, so this may well be the problem. Those hash table moves are really important in getting good move ordering (and a low branching factor). I also keep stats on the fraction of cutoffs from the first move tried and the fraction that are from hash table moves. In this case I'm getting 92% of the cutoffs from the first move and 25% from the hash table. -Dan.
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