Author: Steve Coladonato
Date: 12:11:41 11/15/00
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On November 15, 2000 at 13:01:29, Bruce Moreland wrote: >On November 15, 2000 at 12:53:28, Steve Coladonato wrote: > >>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 > >You are quoting numbers produced by Ruben Fine in Basic Chess Endings, in at >least two of these cases (KQ vs K, and KBN vs K). > >The correct numbers are 10, 16, 19, and 33. > >bruce Thanks Bruce. The numbers I am recalling are from a softcover chess book from around 1972. I do not recall the title of the book but it was not the Ruben Fine book. I no longer have the book but as I recollect it had a black and white chess board motif on it with some red somewhere about 8x10 in size. I am assuming the numbers you gave are from the tablebases. The rook one differs quite a bit but back then I believe the numbers were from human analysis of the basic endings and were probably calculated quite some time before 1972. Steve
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