Author: Peter McKenzie
Date: 11:14:08 06/17/98
Greetings, In a recent post Bob Hyatt posted the following results for the Bratko Kopec test, using Crafty to search all positions to a fixed depth of 9 plies: Positions Searched...... 24 Number right............ 19 Total Nodes Searched.... 34,195,500 I tried this on my program lambChop, and got the following results: Positions Searched...... 24 Number right............ 18 Total Nodes Searched.... 232,925,032 So my program searched almost 7 times as many nodes! What sort of numbers do other programs give? Is Crafty's node count typically pretty low compared to others? Maybe mine has some bugs, or maybe I'm doing too many extensions or maybe my q-search is too big, or .... My search uses R=2 null move pruning, or at least its supposed to :-) Transposition table size was 0.5 million entries. I'm not sure what the standard way of counting nodes is, this is how I do it: I increment my node count in my MakeMove routine, so my node count includes the q-search. I don't count nullmoves as I have a separate MakeNullMove routine. cheers, Peter
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