Hippopotamus Defense Other Variations Puzzle (Rated 1129): Win Material — Crushing Middlegame Pin
This middlegame puzzle is built around a classic pin-based tactical shot. White’s active knight jumps into a forcing check, exploiting the exposed black king and the loose queen on the kingside. The key idea is that the check is not just a king move problem: it also creates a direct threat against a major piece that is poorly defended. In positions like this, a forcing move can convert activity into a decisive material gain.