ECO B23
9 named openings and variations are classified as B23. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Sicilian Defense: ClosedB231. e4 c5 2. Nc3
- Sicilian Defense: Closed, Carlsen VariationB231. e4 c5 2. Nc3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Qd2
- Sicilian Defense: Closed, Chameleon VariationB231. e4 c5 2. Nc3 Nc6 3. Nge2
- Sicilian Defense: Closed, Grob AttackB231. e4 c5 2. Nc3 Nc6 3. g4
- Sicilian Defense: Closed, Korchnoi DefenseB231. e4 c5 2. Nc3 e6 3. g3 d5
- Sicilian Defense: Closed, Portland AttackB231. e4 c5 2. Nc3 Nc6 3. d3 g6 4. g4
- Sicilian Defense: Closed, TraditionalB231. e4 c5 2. Nc3 Nc6
- Sicilian Defense: Grand Prix AttackB231. e4 c5 2. Nc3 Nc6 3. f4
- Sicilian Defense: Grand Prix Attack, Schofman VariationB231. e4 c5 2. Nc3 Nc6 3. f4 g6 4. Nf3 Bg7 5. Bc4 e6 6. f5