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Subject: ICGA_J (June) self-play information

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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