Puzzle #3 for the Puzzle Battle Championship only

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In this position, white is clearly winning with a passed pawn. White also has active rooks while black has two rooks stranded at the back to prevent white from promotion. How can white take advantage of the fact that the king is guarded with a double-pawn structure? White to play

Ans: nc5+!, kc8/kb8, re8 leads to mate. If bxc5, rb1+, kc8, re8+ if rook takes, white is just queen up. If kd7 then rd1 is mate. If he decides to go on a6 instead of c8, then c4! leads to mate next move on a3