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Subject: Re: Forced mate so solve...

Author: Uri Blass

Date: 23:24:20 02/05/01

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On February 06, 2001 at 02:11:13, Uri Blass wrote:

>On February 05, 2001 at 17:41:58, Paul wrote:
>
>>On February 05, 2001 at 17:04:04, leonid wrote:
>>
>>>On February 05, 2001 at 09:15:52, Paul wrote:
>>>
>>>>I've been looking through the archives a bit, and came across this mate that Dr.
>>>>Dann posted a long time ago, it's not too easy, but not too difficult either for
>>>>top programs (but mine has a hard time finding it :) ...
>>>>
>>>>[D]2r3k1/5ppp/7r/Q7/3P1p2/1N3Pnq/PP3K1P/R5R1 b - -
>>>>
>>>>J'espère que ce te plais (my French isn't what it used to be, ha!) ...
>>>
>>>Thanks, Paul! But say me, for the sake of precaution, in how many moves it is
>>>expected mate in your position? Mine, for now, can't see more that 13 moves
>>>ahead.
>>
>>There is a mate in 9 possible ... but my program found a mate in 11.
>>This is the line so you can check later:
>>
>>Ne4+ fxe4 Qe3+ Kf1 Rxh2 Rxg7+ Kxg7 Qe5+
>
>5.Qe5+ is not the best move when the mate from the original position is only
>mate in 10
>
>5.Qg5+ Kf8 6.Qg2 Rxg2 7.Kxg2 Rc2+ 8.Nd2 Rxd2+ 9.Kh1 Qxe4+ 10.Kg1 Qg2#
>
>Uri

I see that I am wrong and 6...Rxg2 is a mistake when 6...Rc2 is a mate in 4
After reading that chest solved it I understood that I am wrong(chest does not
do mistkaes).

6...Rc2 is the move that programs prune so they can see only mate in 10.

Uri



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