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Subject: Book choices in Hiarcs v Rybka engine match

Author: Barry Culp

Date: 15:23:58 01/18/06

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On January 18, 2006 at 16:42:19, robert flesher wrote:

>I use the default settings + playing style= "aggressive" + "Threat Depth 5" +
>"Combinations" + "Hypermodern". I think these were Thorsten settings and they
>are my new default setting. At 30 min or greater they are much stronger than the
>default IMHO. Cheers


Interesting match between Rybka and Hiarcs. In looking at the games
I find some openings that are repeated many times.

[D] rnbqk2r/pp3ppp/3ppn2/2p5/2PP4/P1P2P2/4P1PP/R1BQKBNR w KQkq - 0 7

This opening position occurred 31 times out of 193 games. In all 31 games
Rybka had white and Hiarcs played black. Hiarcs scored 23 out of a
possible 31 points.


[D] r2q1rk1/1b2bppp/p1npp3/1pn3P1/3NPP2/P1N1BB2/1PPQ3P/R3K2R w KQ - 0 14

This opening position occurred 13 times. Again in all 13 games, Rybka
had white and Hiarcs played black. Hiarcs scored 10 out of a
possible 13 points.

Perhaps the results of this match have as much to do with book selection
(Hiarcs10.ctg for Hiarcs and Junior9.ctg for Rybka)
and opening options as it does the Hiarcs engine parameters.

In the Chessbase GUI, if you use a common book and make sure that
"alternate colors" is checked for engine matches, then after every game
the sides are switched and each engine will play the same opening
with white, and then with black. Other book options worth looking at
are  "variety of play" and  "influence of learn value" . Depending on
what book is being used and what book options are chosen, you could find
the same opening line being used many times in one match.




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