English (A28)

Four knights, Marini variation

1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. a3

Four knights (C48)

Spanish variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5

Four knights (C48)

Ranken variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 a6 5. Bxc6

Gruenfeld (D90)

Three knights variation

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3

Gruenfeld (D90)

Three knights variation

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7

Three knights (C46)

Schlechter variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Bb4 4. Nd5 Nf6

Four knights (C48)

Spielmann variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 a6 5. Bxc6 dxc6 6. Nxe5 Nxe4 7. Nxe4 Qd4 8. O-O Qxe5 9. Re1 Be6 10. d4 Qd5

Three knights (C46)

Steinitz variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 g6

Four knights (C46)

Italian variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bc4

Four knights (C46)

Gunsberg variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. a3

Four knights (C47)

Scotch variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4

French (C00)

Two knights variation

1. e4 e6 2. Nc3 d5 3. Nf3

Four knights (C49)

Alatortsev variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Qe7 7. Ne2 d5

Four knights (C49)

Janowski variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Re1

Four knights (C49)

Svenonius variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d5

Four knights (C48)

Marshall variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nd4

Four knights (C48)

Bardeleben variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nxe5 7. d4 Bd6 8. f4 Nc6 9. e5 Bb4

Four knights (C49)

Symmetrical variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6

Four knights (C49)

Symmetrical, Pillsbury variation

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7

Robatsch defense (B06)

Two knights variation

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3