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Subject: Re: full-ply search extension leads to crash city!

Author: Bruce Moreland

Date: 14:20:35 03/07/99

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On March 07, 1999 at 04:57:52, Dave Gomboc wrote:

>My (not chess) playing software searches fine.. or so it seems, when I have an
>"extend on capture" setting of 0 ply, 1/3 ply, 1/2 ply, etc.  But if I set it to
>1 ply, I occasionally hit a position where boom!  there goes the stack.
>
>I am wondering if this is endemic to extending by a full ply or not. (e.g. maybe
>I am hitting a repetition?  I am not currently detecting those.)  But it could
>just be that I have buggy software!  If anyone has noticed this behavior in
>their software, I'd like to hear about what caused it.
>
>FYI, I am using mtd(f), and a "material-only" evaluation function, that is, very
>coarse.
>
>Dave Gomboc

Be careful with the full-ply stuff or you'll kill yourself.  You may want to put
in some debugging stuff to figure out why it's exploding so badly.

I think it may also be a good idea to make the maximum depth quite large, since
the games you otherwise blow up in will all be rated.

bruce



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