C66 — Ruy Lopez: Berlin Defense, Improved Steinitz Defense
Open Games & French (C00–C99)
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6
Full page: Ruy Lopez: Berlin Defense, Improved Steinitz Defense →ECO C66 covers Ruy Lopez: Berlin Defense, Improved Steinitz Defense and related lines (Ruy Lopez: Berlin Defense, Improved Steinitz Defense, Ruy Lopez: Closed Berlin Defense, Chigorin Variation, Ruy Lopez: Berlin Defense, Closed Wolf Variation, Ruy Lopez: Berlin Defense, Hedgehog Variation). Main line 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 with variations, statistics, and the best responses.
7 lines under C66
Ruy Lopez: Berlin Defense, Improved Steinitz Defense
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6
Ruy Lopez: Closed Berlin Defense, Chigorin Variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Nd7
Ruy Lopez: Berlin Defense, Closed Wolf Variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 exd4
Ruy Lopez: Berlin Defense, Hedgehog Variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7
Ruy Lopez: Berlin Defense, Closed Bernstein Variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bg5
Ruy Lopez: Berlin Defense, Closed Showalter Variation
1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bxc6
Ruy Lopez: Berlin Defense, Tarrasch Trap
1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. O-O Be7 7. Re1 O-O