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Diagram above: Black to move. What would you do?
Scroll down to see the solution.
1… Rf1+ 2. Kxf1 Qf2#
1… Rf1+ takes advantage of the pinned bishop to force the white king to the f1-square, where Qf2# will be checkmate.
Note that if black instead played 1… Qf2+, right away, it allows the white king to escape, Kh1 or Kh2.