Chess Online

@ suentun: No offense meant, but I think you must have missed some of the threats here. This exercise is not nonsense at all, in fact I think it is a rather good one, although I'm surprised it is not higher rated.

You probably were wondering why black leaves the queen en prise?

Well let's see what happens when after 1...c5 2-Nd5! black moves the queen away from the a5-d8-diagonal:

1. ... c5
2. Nd5 Qa6
3. Nc7#

Oops, that's checkmate.

So you see, the black queen must stay on this diagonal, defending against Nc7#.

2...Qa5+ looks good, you might say? Well let's see what happens:

1. ... c5
2. Nd5 Qa5+
3. b4 cxb4
4. Nb3

Black can either give up the queen or be checkmated by Nc7#. I don't think that was very easy to spot, but it's a nice tactical exercise in my opinion.