Author: Jon Dart
Date: 20:44:36 05/15/99
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It is a subjective impression, but Comet seems to me like one of the more aggressive engines. However, a couple more comments: check extensions and king safety are not really related all that closely. King safety is a positional evaluation and it is most effective when it can detect threats whose full effect will appear only over the program's search horizon. I've found the best way to tune king safety is to play humans on the chess servers. Even expert-level players can and do work up an effective attack, and many are computer-savvy enough to do a gradual assault that first makes weaknesses and then exploits them. Check extensions can make searches more effective, by helping to find "deep" tactics that you would otherwise miss; but it's a very double-edged tool. You will solve some tactical problems faster with a check extension, but you will probably solve some slower, too, since sometimes extending just makes your tree bigger without getting you a much more accurate score. I find test suites useful for tuning stuff like this, because you will be able to see the tradeoffs on a range of tactical positions. --Jon
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