Nimzo Indian Defense Discovered Attack Beginner Chess Puzzles

In the Nimzo-Indian Defense, a common starting point is 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4, where Black pins the knight on c3. A discovered attack beginner pattern appears when moving a pinned piece or a piece behind it opens a line for another piece to attack, often against the queen, king, or a loose bishop.