Benko's Composition
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So what are we going to do with this Benko's composition? Is think this is a win for white...?
Well, that's for you to decide. The idea is to play the best move. If you think White can win, look for a win. If not, try to find a way to hold a draw.
Looks like white can win after Nb5
After 1... Kb1 the black king escapes, so the Knight cannot move, to keep the king trapped
@Markus24: I assume that you used a computer, which pretty much ruins the point of the puzzle. If not, congratulations! You are an amazing chess player!
However, I think you need some more information in the analyses. First, in the "main line" (Actually, your side-variation is the real thing), after 5.Kc4, what does White do after 5...b4+? This one's pretty simple.
In the variation in blue, try playing against 3...Kd3!, as it makes things more difficult. Once again, please don't use a computer, as that defeats the purpose of trying to solve this beauty.
This is the result if Black plays his best.