White intends to play 1.Rd4+ followed by e4#, but unfortunately cxd4 and exd4 both open into checks on the white king. How does White circumvent this difficulty? White to play and mate in 4. Find the key move.
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1. Qa6 Ra1 - Black defends against the Nb6-Qa8 idea. How should White proceed now?
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2. Qd6+ exd6 - How should White continue?
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3. Rd4+ exd4 - White to play and finish it off!
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1. Qa6 Qa2 - Black defends against the Nb6-Qa8 idea with the queen instead of the rook. How does White continue?