Lubomir Ftacnik (Black) Puzzle: Pin — Rook Tactics
A discovered attack occurs when one piece moves away and unveils the force of another piece behind it. In this middlegame position, the active rooks create a powerful double threat against the exposed black king and an overloaded enemy rook. The key is that a pinned major piece cannot freely respond to pressure, so a forcing capture can transform an apparent material deficit into a decisive material gain. This is classical chess calculation at its sharpest.