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This problem, which has been a favourite of mine ever since
I first saw it, was composed by Macleod in just 15 minutes
(!), during a train journey with veteran former Scottish
Champion, W A Fairhurst.
This problem is a splendid example of the cross-check in
1.Kc4! This striking key threatens 2.Qc5 mate, but also
steps into no fewer than three possible discovered checks.
However, all open a vital white line, guarding the flight
on f5, and thus allowing a cross-check and mate.
Thus, any move of the Bf4 eg. 1...Bh2+ opens the Rf3's line,
Any move of the Re6 opens the WQ's guard of f5, allowing
(eg) 1...Re8+ 2.Nd5#; whilst advancing the Pd3 opens the
Bb1's line of guard of f5, allowing 1...d2+ 2.Ne2#.
Finally, there is the by-play variation 1...Kf5
(self-pinning the Re6 and Bf4) 2.Ra5#
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