Author: Roy Brunjes
Date: 21:11:43 01/11/03
Hi fellow CCCers, I analyze games (mine and other players as well) with the help of chess software. I notice that virtually all programs exhibit this behavior: Analyze a position with White to move. Let's say the eval shows as +0.27 where + values mean that White stands better (and consequently - values mean that Black stands better). Now, make the move that the software thought was best in that position. So now it is Black's turn to move. Analyze the new position with Black to move. In quite a few cases, the eval shown now will be significantly different from the previous position. Of course if there is some tactic that is suddenly spotted, I would expect this kind of behavior. In many cases, this is not what is causing the big swing in the eval. I've heard, years ago, of programs using "pre-processing" (or something similar to that term) algorithms that could cause this type of eval swing from one move to the next. I had thought (perhaps mistakenly) that more recent programs had largely done away with this concept as it was undesirable, at least from the point of view of a human trying to analyze with the help of a program. In the current crop of programs, which stand out as the ones that do not frequently have these large eval swings from one move to the next? I'm thinking such programs, even if a bit weaker than others, might make better analysis partners for me. Thanks for your thoughts! Roy
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