Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nf6/3. Nxe5/3...d6/4. Nf3/4...Nxe4/5. Nc3

Petrov's Defence rd nd bd qd kd bd rd pd pd pd pd pd pd pd nd nl nl pl pl pl pl pl pl pl rl bl ql kl bl rl 5. Nc3 This is the Nimzowitch Attack of the Petrov's defense, often played if White wants to imbalance the position in the otherwise dull and symmetrical Petrov. Usually Black takes the knight on c3 with 5...Nxc3, to compromises the White pawn structure, though if Black insists on keeping symmetry, he may also retreat the knight with 5...Nf6 instead. Theory table +567... Nxc3dxc3 Be7Be3 O-O=... Nf6d4 d5Bd3 Bd6 +/= Petrov's Defence