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The Grimshaw theme, of mutual interference by rook and
bishop, is one of the most famous of all. Here, the great
Russian composer Lev Loshinski manages to create a triple
By defending the Nb4 a second time, White creates the threat
of 2.d4 mate. Black has three ways to defend. The first is
to cut this new line of guard from b1–b4, by putting a
piece on b2. However, 1...Rb2 blocks the Ba1's guard of c3,
allowing 2.Qxc3 mate, whilst 1...Bb2 interferes with the
Ra2's patrol of the 2nd rank, allowing 2.Qf2 mate. The
second defensive try is to cut the line from h4-d4, by
putting a piece on g4. However, we then get a second
Grimshaw - 1...Rg4 cuts the Bh3's guard of e6 for 2.Se6
mate, whilst 1...Bg4 cuts the Rg6's guard of g1, allowing
2.Bg1 mate. Finally, Black can cut the white line f7-a2 by
putting a piece on e6, so as to create a king flight on c4.
However, now the third Grimshaw appears: 1...Re6 cuts the
Bh3's guard of d7, allowing 2.Sd7 mate, whilst 1...Be6 cuts
the Rg6's guard of d6, allowing 2.Bd6 mate. Finally, there
is also the insignificant by-play 1...Rd6 2.Bxd6 mate.
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