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Subject: Re: Wierd hash problems

Author: Bruce Moreland

Date: 02:53:34 08/20/99

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On August 20, 1999 at 05:15:26, James Robertson wrote:

>Ok, I will go through carefully and see if there is any data not reset before a
>new search.

It could be anything, and since I don't know your whole implementation it would
be hard to guess.

If it was my program, I'd be worried that I was viewing some positions as being
repeated positions that aren't really, but I don't know if you are vulnerable to
that one.

It could also be a bug that's there all the time, but only shows up in this case
because alpha and beta are different.  You will have to be creative about
identifying your own dumb mistake, which is hard, because you already failed to
identify your own dumb mistake at least once, since you coded it in.

It could be a really hard one.  But it's important to fix it because this sounds
like the type that doesn't crash you, and doesn't make you look markedly dumber
in test suites than last week's version did, it just makes you weaker in real
games, and that's a very bad sort of bug.

bruce



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