Author: Pat King
Date: 13:19:24 07/11/99
I recently ran a series of tests on SweetReason 1.7, my chess program, turning on and off various features to determine their effect on search speed and program strength. In general, I got expected results. Ie, my program appears to gain 140 Elo points/ply, and the typically reported figure's about 200 (effect of increased knowledge in evaluation?). The surprise came in evaluating the check extension. Common sense would lead one (well, me) to expect the check extension to increase strength and decrease speed. I had exactly the opposite effect -- using check extension appears to drop 200 Elo points, but also reduce the nodes visited in a fixed depth search by 40%! I can write off the Elo effect to small sample size, but the other figure has enough data behind it to stand up. Could the improved evaluation of "checky" positions cause enough cutoffs to do this?
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