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Subject: Re: Easy mate

Author: Rafael Andrist

Date: 11:31:55 09/13/03

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On September 13, 2003 at 14:08:37, John Merlino wrote:

>On September 13, 2003 at 10:23:41, Frank Phillips wrote:
>
>>[D]8/4k3/8/8/4Kp1p/5N1N/8/8 w - -
>>
>>Just an amusing position.
>>
>>White to move and win.  Perhaps the longest forced mate my program has played.
>>I was not sure whether it would be caught out by the 50 moves rule.  (Any credit
>>goes to Eugene of course.).
>>
>>It traded down from B+Pawns versus 2N+Pawns to reach this endgame.  My heart
>>sank and I was already to fix yet another evaluation quirk - maybe still need
>>to.
>>
>>Frank
>
>Kxf4 is a forced mate in 90 moves and it will NOT be caught by the 50-move rule.

No, after Kxf4 it is a draw. You need 51 moves to the next forced capture/pawn
push with best defence.

Also, I did a short search up to depth 13 and could not find a win which would
not have been prohibited by the 50-move rule.

The endgame is anyway only won in about 23% of all cases and even then, you will
fail to win it in more than 50% without the appropriate endgame tables.

regards
Rafael B. Andrist



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