
Solution

1. Bg6
White takes advantage of the absolutely pinned f7-pawn and threatens Qxf7#
If black tries to defend the f7-pawn, by playing Re7, then Qh8# will be checkmate.
1. Bg6
White takes advantage of the absolutely pinned f7-pawn and threatens Qxf7#
If black tries to defend the f7-pawn, by playing Re7, then Qh8# will be checkmate.