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Subject: Re: perpetual check recognition

Author: John Merlino

Date: 10:19:58 01/31/04

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On January 31, 2004 at 09:50:08, Mike Byrne wrote:

>On January 30, 2004 at 10:41:27, John Merlino wrote:
>
>>I can't tell you how Johan determines perpetual check inside The King. But I can
>>tell you that it finds that Rxh2 is a draw very quickly. Here are the top five
>>moves as listed by the SKR personality on a P4-2.4 after 2 seconds:
>>
>>Time	Depth	Score	Positions	Moves
>>0:02	1/8	-3.56	490764		47...Rg2 48.h3 Rf8 49.Qe7+ Rf7
>>					50.Qe6 Rgf2 51.Qxa6 R2f5+ 52.Kg4
>>					Rf4+ 53.Kg3 Bf2+ 54.Kh2 Rxh4
>>0:01	1/7	-2.72	210618		47...Ra2 48.Qg6+ Kf8 49.Qxa6 Rxh2
>>					50.Qd6+ Kg8 51.Qe6+ Rf7 52.Qe8+
>>					Kg7 53.Qe6
>>0:01	1/7	-2.54	231865		47...Rb2 48.Qg6+ Kf8 49.Qd6+ Ke8
>>					50.Qxa6 Kd7 51.h3 Rf5+ 52.Kg6
>>0:01	1/7	-2.30	300530		47...Rff2 48.a5 Rf6 49.Qd7+ Rf7
>>					50.Qg4+ Kf8 51.Qc8+ Ke7 52.Qb7+
>>					Kf6 53.Qxa6+ Ke7
>>0:01	1/7	0.00	178906		47...Rxh2 48.Qg6+ Kf8 49.Qd6+ Ke8
>>					50.Qe6+ Kd8 51.Qd6+ Kc8 52.Qc6+
>>					Kb8 53.Qb6+ Kc8 54.Qc6+
>>
>>As you can see, it has already determined that Rxh2 is a draw after a 7-ply
>>search. Up until that discovery, Rxh2 was the best move, with an eval of -3.7.
>>
>>jm
>
>Hi John,
>
>I noticed that you often use the SKR personality setting - is it your belief
>those are the strongest settings for CM9K?
>
>Best,
>
>Michael

I think that the SKR settings are more likely to produce better results for
lengthy analysis than the default settings would.

That's probably the best way to put it.... :-)

jm



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