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A problem which shows in selfmate form an idea which was exploited many times in directmates by the Warton brothers.
Solution: The position is a complete block. If the bishop is neutralised then 2...b4 mate is forced, hence the set variations 1...Bxc7 2.Rxc7, 1...Rd6 2.Rxd6; 1...Bf6 2.gxf6; 1...Bg7 2.Rxg7; 1...Bh8 2.Rxh8; 1...Bh2 2.Rxh2; 1...Bg3 2.fxg3; 1...Bf4 2.Rxf4 and 1...Bxd4 2.Rxe4. White however has no waiting move, and the line-clearing key 1.Rdh7 abandons the set capture on d6, instead exploiting the newly formed black battery – 1...Bd6 2.Qf7+ Se6. There is a second, less interesting change, with a different rook capturing after 1...Bh8. The other variations remain as set. The Grab Mutate was a favourite theme of the Warton brothers, and many examples in directmate three-movers can be seen in the collection under British Composers.
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