Cool tactic: Can you spot it? (Unbelievably, I did!)

Find the ONLY move that wins. (Black to move)

if the king does not take the knight its to complex

@chirinexmimix How is it complex? You then win the exchange, and then it's on you to finish the game off.

@Neverness you have proven steinitz theorem, knights belong behind enemy pawns.

I had the exact same position in the Moscow invitational 1949...I didn't see this move

Very impressive! I doubt I would have spotted it if I was playing.