Author: Alex Szabo
Date: 09:31:41 12/06/03
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On December 06, 2003 at 11:22:15, Alex Szabo wrote: >My self-play experiment between crafty versions 19.6 and 17.14 resulted in the >19.6 version being stronger by 11 (plus or minus 2) rating points. > >The experiment was for 20,000 games at a 20+1 time control. It was run on a >2x2GHz pentium4 linux system with xboard 4.2.6. I can include other details if >there is interest. Here are some more details: (1) 4 matches were run at the same time (2) pondering was on (ie normally 8 craftys were competing for CPU time) (3) hyperthreading was disabled (FYI, when enabled there are 4 processors and 5-10% better nodes/sec on this type of computation) (4) use of 3 & 4 piece tablebases was enabled and cache set to 32M (5) learning was disabled (6) there was no opening book; games started from 10,000 different opening positions compiled from a database of grandmaster games (7) each unique starting position was played twice with players reversed (8) all other crafty settings were default (9) used 17.14 compiled with icc (-O3 -march=pentium4) which gets 849,011 n/s on bench command (10) used 19.6 compiled with icc (-O3 -march=pentium4) which gets 796,900 n/s on bench command
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