Nimzo-Indian Discovered Check Chess Puzzles

The Nimzo-Indian Discovered Check is a tactical motif that can arise in positions from the Nimzo-Indian Defense when a piece moves away and uncovers a check from a bishop, rook, or queen. It is especially common after the bishop on b4 pins a knight on c3 and the center opens, creating a line for a hidden attacker to give check. For an intermediate player, the key idea is that the checking piece was already aimed at the king, but its line was blocked until the front piece moved.