Related Openings
Four knights - Nimzovich (Paulsen) Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, Bxc6
Four knights - Symmetrical, Maroczy system	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, d6, Ne2
Four knights - Symmetrical, Tarrasch Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, d6, Bg5, Be6
Four knights - Symmetrical, Blake Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, d6, Bg5, Ne7, Nh4, c6, Bc4, d5, Bb3, Qd6
Four knights - Symmetrical, Capablanca Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, d6, Bg5, Bxc3, bxc3, Qe7, Re1, Nd8, d4, Bg4
Four knights - Symmetrical, Metger unpin	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, d6, Bg5, Bxc3, bxc3, Qe7
Four knights - Symmetrical Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, d6
Four knights - Svenonius Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, Bxc3, bxc3, d5
Four knights - Janowski Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, Bxc3, bxc3, d6, Re1
Four knights	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, Bxc3
Four knights - Alatortsev Variation	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, d3, Qe7, Ne2, d5
Four knights - double Ruy Lopez	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4
Four knights - Gunsberg counter-attack	e4, e5, Nf3, Nc6, Nc3, Nf6, Bb5, Bb4, O-O, O-O, Nd5, Nxd5, exd5, e4