Nimzo Indian Defense Classical Variation Puzzle (Rated 1317): Win Material — Tactical Refutation

This puzzle comes from the Nimzo-Indian Defense, Classical Variation, and it shows a classic middlegame tactical refutation. White’s advanced knight looks active, but it is overextended and vulnerable to a forcing sequence that wins material. The key idea is to notice when a seemingly strong piece can be hit with tempo, especially when it also creates a fork or exposes another piece. In practical classical chess, these tactical details often decide the game before the position can settle.