Author: guy haworth
Date: 04:53:50 09/05/01
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In the Ken-Thompson-themed ICGA Journal (June, 2001), Ernst Heinz published his latest self-play experiment results. Engines with different guaranteed-depth(?)-parameters were pitted against each other. The matches of the experimetn (3,000 games each) suggest that: 12-ply was 84 ELO points better than 11 ply 11-ply was 92 ELO points better than 10 ply 10-ply was 115 ELO points better than 9 ply Fairly strong indications of decreasing returns from increasing search. No doubt a proper statistical analysis will follow. An extra ply seems to require 4-6 times the 'effective power', so a factor of 36 - if realised across the system - is only 2 plies. On this basis, an engine might be some 160 ELO points better on hardware giving a power factor increase of 36. G
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