Author: blass uri
Date: 09:12:07 12/02/99
Go up one level in this thread
On December 02, 1999 at 07:55:01, Peter Fendrich wrote: >On December 02, 1999 at 05:10:20, Ed Schröder wrote: > >>>Because here is what your program will do: (a) I like Bxh6, but after I get to >>>depth=7 I see that it is bad... so (b) I will first play two captures that >>>eat 4 plies, then a check to eat a couple more, and _then_ I can now play Bxh6 >>>and I don't see anything bad happening. >> >>This ONLY happens if the software (in this case King Safety)... >>a) is TOO speculative (too high values) >>b) missing important knowledge -> inaccurate judgement >>c) is not in balance with other positional rules (values) > >But isn't the case that eval functions has all these deficiencies, otherwise >we wouldn't need the search at all. Ed did not say that it is 100% correct but only that cases that the evaluation tells rebel to sacrifice a wrong sacrifice are relatively rare. There are 2 kind of mistakes: mistake a: do a sacrifice when it is wrong. mistake b:avoid a sacrifice when it is right. The evaluation usually does not tell rebel to do mistake a and there are cases when Rebel need search to avoid mistake b so I believe that the evaluation is not too risky. If ed will be more "careful" in the evaluation the result will be that Rebel will do more mistakes because it will do mistake b in many cases and will not earn much by avoiding mistake a Uri
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