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Puzzle C3: White to move and mate in 7

To see the hint or solution, drag your mouse accross a box below while holding down the left mouse button.

HINT:

White's new Queen checks on the rank and file, while preventing checks by Black's new Queen.

SOLUTION:

1.h8=Q a1=Q   2.Qe8! Qa4   3.Qe5+ Ka8   4.Qh8 Qf4   5.Qa1+ Qa4   6.Qxa4+ Kb8   7.Qa7#