Sicilian, Szen, hedgehog variation (B44)

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. Na3 Be7 9. Be2 O-O 10. O-O b6

Sicilian, Szen (`anti-Taimanov') variation (B44)

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5

Sicilian, Szen variation, Dely-Kasparov gambit (B44)

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. Na3 d5

Ruy Lopez (C66)

Berlin defense, hedgehog variation

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7

English (A30)

Symmetrical, hedgehog system

1. c4 c5 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Be7

English (A30)

Symmetrical, hedgehog, flexible formation

1. c4 c5 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7 5. O-O e6 6. Nc3 Be7 7. d4 cxd4 8. Qxd4 d6 9. Rd1 a6 10. b3 Nbd7

Sicilian (B40)

Pin variation (Sicilian counter-attack)

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4

Sicilian (B41)

Kan variation

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6

Sicilian (B27)

Hungarian variation

1. e4 c5 2. Nf3 g6

Sicilian (B32)

Nimzovich variation

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d5

Sicilian (B32)

Flohr variation

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qc7

Sicilian (B58)

Boleslavsky variation

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5

Sicilian (B59)

Boleslavsky variation, 7.Nb3

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nb3

Sicilian (B27)

Quinteros variation

1. e4 c5 2. Nf3 Qc7

Sicilian (B27)

Katalimov variation

1. e4 c5 2. Nf3 b6

Sicilian (B28)

O'Kelly variation

1. e4 c5 2. Nf3 a6

Sicilian (B98)

Najdorf variation

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7

Sicilian, Chekhover variation (B53)

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4

Sicilian (B40)

Pin, Jaffe variation

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. Bd3 e5

Sicilian (B40)

Pin, Koch variation

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. e5