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Subject: Re: I need help with Search/Selective Extension

Author: Georg v. Zimmermann

Date: 07:59:51 08/25/02

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On August 25, 2002 at 08:00:53, scott farrell wrote:

>Some more questions.
>
>I have fractional depths going now, so I can do a partial extension for
>recpatures etc.
>
>I tried extending straight after doMove, if it is a checking move do a SE (or
>partial), but it really blew out the number of nodes.

It shouldnt. Did you re-read your code a couple of times ? Maybe you are
extending 1 ply for the first possible check, 2 ply for the next ... bugs like
that happen.

>
>During null-move searching should SE be disabled?
>During non PV should it be disabled? (I guess not)
>How about during IID searches?

No to all. A check is more interesting (less quiet) than a non checking move,
whether I am in a null-move search or not. You dont turn extensions off
anywhere.
Some tune them based on alpha and beta. But thats an advanced course :P

Georg



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