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Subject: impact of early queen exchange on performance

Author: Mike S.

Date: 10:28:50 10/09/02


Percentages, based on a large comp-comp database:

Engine          | #Games   total  W    B  | total eQE* W/eQE   B/eQE
-------------------------------------------------------------------
Fritz 7         |  784      69%  72%  65% | 59% (#57)   53%     67%
Chess Tiger 14  |  850      66%  71%  62% | 72% (#71)   73%     71%
Shredder 6/-P.  |  743      61%  65%  57% | 58% (#58)   63%     53%
Junior 7        |  799      55%  58%  53% | 41% (#60)   25% !   56%

*) "eQE" = early queen exchange (within the first 10 moves)

Fritz 7's white percentage after an early exchange of the queens was 53% only,
compared to it's general white average of 72%! Remarkable also Tiger 14's result
with black: Much better (71% to 62%) without queens. Desastrous was Junior 7's
result with white when the queens were off the board soon: only 25% (in 30 games
of that kind).

It looks as if the engines each are very different, in how they depend on having
the queen... with Shredder 6/-Paderborn showing the smallest impact.

For games with Black against Fritz 7 or Junior 7 (and probably against others
too for which I didn't search the statistics), it could be promising to have an
opening book which favours eQE variants... But that of course must not have
"wholes" in other (more common) lines, so it can't be done by simply generate an
opening tree based on an eQE games database only.

Regards,
M.Scheidl



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