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Subject: Re: K+Q vs. K: always mate in at least 8 moves?

Author: Steve Coladonato

Date: 09:53:28 11/15/00

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On November 15, 2000 at 12:20:30, Robert Ericsson wrote:

>A friend of mine claims that the stronger side will, from any start position,
>deliver a mate in at least 8 moves in a K+Q vs. K endgame.
>
>Is his claim correct? If not, how many moves would be the correct claim?
>
>Kind regards,
>Robert

I remember the following from long ago:

From any start position, a mate can be accomplished in at most the following
number of moves:

 KQ v K =  9 moves
 KR v K = 12 moves
KBB v K = 20 moves
KBN v K = 34 moves

I don't recollect if the stronger side is on the move or the weaker.

Also, the latest tablebases may have shed some light on the above numbers.

Regards,

Steve



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