I have been trying to solve this for a long time, but can't find a solution. How can white force a checkmate in 2 moves?
1R6/4p3/2pkB3/4n1N1/8/1N2K1B1/8/8 w - - 0 1
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Ask yourself: what would Black do if he were to move? After 1... Kc7, 2. Bxe5 is mate. His other option is 1... c5, threatening to escape with 2... Kc6.
1. Nc5! blocks the c-pawn. Black gets the additional option of 1... Kxc5, but after that, 2. Ne4 is mate.
(I can post an interactive version, but that doesn't work with spoilers. And it's a good visualization exercise.)