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This week a 2-mover by a composer who is still one of Britain's leading composers, fully 56
years after the publication of this effort! No clues this week!
This problem is all about white self-pins and unpins. The try 1.Rxf4? (self-pinning)
threatens mate by 2.Rhxf3. The two defences 1...Se5 and 1...Sg3 both unpin
the wRf4, allowing mates by 2.Re4# and 2.Rxf3# respectively. However,
a neat counter-pin by 1...Rh8! defends.
Instead, the key is the alternative self-pin 1.Sxf4! with the same threat of 2.Rxf3.
This provides two changed mates against the thematic unpinning defences:
1...Se5 2.Sg2# and 1...Sg3 2.Nd5#. In both phases there are by-play
variations, 1...Bh5 2.Qe4 and 1...Bxf4+ 2.Qxf4.
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