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This week, another 2-mover, closely related to last week’s, as we will explain on
We have set play in the form of 1...Q random 2.Qd6#, (1...R any 2.Sf5#, 1...e3 2.Se2#
and 1...Bf2 2.Sf5#.
The try 1.Bh5? threatens 2.Se2#, and 1...Rc2 allows 2.Sf5#, but 1...Bd3! refutes.
The key 1.Rf1! threatens 2.Sf5# with the variations 1...e3 2.Se2#, and
Thus, the try-threat 2.Se2# recurs as the post-key mate in the line 1.Rf1 e3
2.Se2#, whilst the try-mate 2.Sf5# recurs as the threat in the post-key phase. This
is similar to the le Grand theme, which we saw last week, but not the same — in the
le Grand proper, the threat and mate are reciprocally changed after the same
defence in different phases, whereas here the change occurs after different
defences (1...Rc2 and 1...e3). For that reason, the effect we have in this problem
is known as a Pseudo le Grand.
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Steve Giddins, our Librarian and Archivist, using the 'Contact'
item in the menu on the left.