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Subject: Re: SEE and pin detection

Author: Vasik Rajlich

Date: 03:52:10 08/31/04

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On August 30, 2004 at 19:44:50, Eugene Nalimov wrote:

>On August 30, 2004 at 14:03:49, Dan Honeycutt wrote:
>
>>In spite of Dr. Hyatt's admonishment that this was a loser in Crafty, I'm bent
>>on trying it.  Since I do legal move generation I can do the pins for half price
>>- I either have or can use the pin data for one side in conjunction with
>>generating moves.  I just finished the routine.  My NPS dropped by just over 4%
>>on bench test psitions.  I've just started testing an hope to have some
>>indication if pin detection is a win, lose or draw in a few days.
>>
>>One aside - the pin detection is not always more accurate (or mine isn't).  In
>>the following position for the move Nxg5 the no-pin SEE correctly returns +1
>>where the pin-detection SEE comes back with -2.
>>
>>[D] 7k/4q3/8/6p1/4N3/5N2/8/4K3 w - -
>
>
>White is lost in 24 :-)
>
>Thanks,
>Eugene

Really? This ending is only lost in exceptional cases - and it's certainly not
obvious that this is one of them.

Vas

>
>>Fixing this would require keeping track if the pinning piece enters the
>>exchange, which I'm afraid would bee too expensive.
>>
>>Dan H.



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