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Subject: Re: Theory: Deeper Search creating worse performance due to PE

Author: Uri Blass

Date: 02:25:01 01/05/06

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On January 05, 2006 at 05:07:09, Joel wrote:

>Hi Uri,
>
>How about putting a minus sign in front of an already good evaluation function?
>:)
>
>Joel

I doubt if it is going to help.

It will have no problem to sacrifice material at small depthes when with deeper
search it may see forced mate against itself and avoid the mistake and even
without seeing forced mate it may see that the opponent can sacrifice back
material.

Take the position after
1.e4 e5 2.Qh5 Nc6

It is clear that 3.Qxf7+ is going to be played at small depth by reversing the
sign of the evaluation.

I suspect that at high depth white may prefer to delay the sacrifice because
white may find that black also can force force white to capture the queen some
plies later.

Uri



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