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This week’s problem is an orthodox threemover. The presence on the board of two
black R+B pairs will serve as a valuable clue to the experienced solver!
This problem neatly demonstrates the two famous R+B mutual interferences, Nowotny and
Grimshaw. The key is 1.Rd1 which threatens the Nowotny 2.Qg6+, with the pair of
mates 2...Bxg6 3.Nxg5# and 2...Rxg6 3.Bf5#.
Black's main defences involve cutting the white Rd1's guard of the d-file, so as to
create a king flight after 2.Qg6. However, the two black piece moves to d2 constitute a
Grimshaw: 1...Bd2 blocks the Rb2's guard of the second rank, allowing 2.f3+ gxf3 3.Nf2#,
whilst 1...Rd2 blocks the Bc3's guard of e1, and thus permits 2.Re1+ Re2 3.Rxe2#.
There is one by-play variation, 1...Bd4 2.Rxd4+ exd4 3.Qxd4#.
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