user13370: 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


user7297: 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.
The solution:

 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.)

13370: <p>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?</p>

<pre><code>1R6/4p3/2pkB3/4n1N1/8/1N2K1B1/8/8 w - - 0 1
</code></pre>
 7297: <p>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.</p>

<p>The solution:</p>

<blockquote class="spoiler">
  <p> 1. Nc5! blocks the c-pawn. Black gets the additional option of 1... Kxc5, but after that, 2. Ne4 is mate.</p>
</blockquote>

<p><sub>(I can post an interactive version, but that doesn't work with spoilers. And it's a good visualization exercise.)</sub></p>
