Problème d'il y a 2 jours

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Bruno's Chess Problem: 22/01/2020

W.Byas, The Chess Problem, 1946

Mat en 2 (***)
chess problem diagram
Les blancs jouent

Astuce :

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Cacher la solution
1. g3! ... 2. Rf4#
  1... Nc8, Ng8, Ng6 2. d5#
  1... Nexc6 2. Nd7#
  1... Nd5 2. Qd3#
  1... Nf5 2. Nf6#
  1... Bxg3 2. Nxg3#
  
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2020-01-22 18:38:16, by problemist
From the obituary of Bill Byas by N. A. Macleod, in "The Problemist," November 1983, p. 379-380 (available online):
"Lt. Col. Walter Byas 13 July 1905-15 July 1983. Bill Byas, who had been a member of the BCPS since the 1920s, started composing while serving in India, on the North West frontier. His first problem was published in 1930. His output was small, 73 problems in all - all 2-movers, but every one of his problems was of high quality and many won tourney honours. His favourite
problem was 2Pr, Olympic Tourney 1948 , a superb combination of Black correction and dual avoidance. He did not compose any problems after 1948, though some were published later, possibly because he was not in sympathy.with the modern trends in the 2-mover. On his retirement from the Army he
worked at GCHO, Cheltenham, and played correspondence chess in the BCCS tourneys and for the County team. He was a keen bridge player all his life and was for many years secretary of the Cheltenham Bridge Club."
2020-01-22 07:14:22, by problemist
Any move of wNe5 threatens 2. d5# but there is 1.. Ra4! So the good and hidden key is quite different blocking the bB with the threat 2. Rf4#. Now any move of bNe7 defends the threat as it pins wRf7. 1.. N~ 2. d5# and the corrections 1.. Nf5, Nd5 are used as self-blocks 2. Nf6#, Qd3#, finally 1.. Nexc6 (self-pin) 2. Nd7#.

Walter Bill Byas (* 13.7.1905, † 15.7.1983) British composer.
2020-01-22 01:23:21, by slowbut2
before my seeing comments: My solution [arrived to through the 32-pixel, B&W, restartable-moving-pieces setting]: in view of the possibility\s: south-rook mate\ east-knight mate\ , to mate with north rook after south black-knight captures pawn [or mate with queen\ rooks\ knight ] , white's gthree starts

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