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Subject: Re: Mate in 6 !

Author: Uri Blass

Date: 07:34:58 09/29/02

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On September 29, 2002 at 10:21:25, Rolf Tueschen wrote:

>On September 29, 2002 at 09:02:17, Charlie GOLD wrote:
>
>>
>>     What machines find the mate?    This is from Chess Life, Sep. 2002, page
>>42.
>>    [D] 7K/7P/8/8/4Q2p/8/4R1rp/6rk w - -
>
>
>How about this one?
>
>This is from Rolf Tueschen, Sept29,2002:
>
>[D]7k/7p/8/8/4q2P/8/4r1RP/6RK b - - 0 1
>
>Rolf Tueschen

Too easy
Movei see the mate at depth 4.

15110 <first : 1 535 0 63 h7h5
15110 <first : 2 536 0 97 h7h5 h2h3
15110 <first : 2 536 0 370 h7h5 h2h3
15110 <first : 3 548 0 464 h7h5 h2h3 h8h7
15110 <first : 3 548 0 1392 h7h5 h2h3 h8h7
15110 <first : 4 585 0 1995 h7h5 h2h3 e2e3 g1c1 e3h3 h1g1
15110 <first : 4 586 0 4272 e4f3
15110 <first : 4 9993 0 5147 e4f3 h4h5 h7h6 h2h3 f3h3 g2h2 e2h2
15110 <first : 4 9993 0 5334 e4f3 h4h5 h7h6 h2h3 f3h3 g2h2 e2h2

Movei does not use null move pruning when the opponent has less than 10 moves so
it clearly does not use null move here.

It can fail in null move problems but not here.

Uri



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