
Solution

1… Ng4 overloads the defender of the f1-Rook and threatens Qxh2# at the same time.
Ie. 1… Ng4 2. Bxg4 Qxf1#
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1… Ng4 overloads the defender of the f1-Rook and threatens Qxh2# at the same time.
Ie. 1… Ng4 2. Bxg4 Qxf1#