ECO B21
32 named openings and variations are classified as B21. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Bird Opening: Dutch Variation, Batavo GambitB211. e4 c5 2. f4 d5 3. Nf3 dxe4
- Sicilian Defense: Coles Sicilian GambitB211. e4 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qd1 Nf6 5. Bc4
- Sicilian Defense: Halasz GambitB211. e4 c5 2. d4 cxd4 3. f4
- Sicilian Defense: McDonnell AttackB211. e4 c5 2. f4
- Sicilian Defense: McDonnell Attack, Tal GambitB211. e4 c5 2. f4 d5 3. exd5 Nf6
- Sicilian Defense: McDonnell Attack, Toilet VariationB211. e4 c5 2. f4 d5 3. Nc3
- Sicilian Defense: Morphy GambitB211. e4 c5 2. d4 cxd4 3. Nf3
- Sicilian Defense: Morphy Gambit, Andreaschek GambitB211. e4 c5 2. d4 cxd4 3. Nf3 e5 4. c3
- Sicilian Defense: Smith-Morra GambitB211. e4 c5 2. d4
- Sicilian Defense: Smith-Morra Gambit AcceptedB211. e4 c5 2. d4 cxd4 3. c3 dxc3
- Sicilian Defense: Smith-Morra Gambit Accepted, Chicago DefenseB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 d6 5. Nf3 e6 6. Bc4 Nf6 7. O-O a6
- Sicilian Defense: Smith-Morra Gambit Accepted, Classical FormationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 a6 7. O-O Nf6
- Sicilian Defense: Smith-Morra Gambit Accepted, Danish VariationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nf3
- Sicilian Defense: Smith-Morra Gambit Accepted, Fianchetto DefenseB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 g6
- Sicilian Defense: Smith-Morra Gambit Accepted, Finegold DefenseB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Nf3 d6 6. Bc4 a6 7. O-O Be7 8. Qe2 Nf6
- Sicilian Defense: Smith-Morra Gambit Accepted, Kan FormationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Nf3 a6
- Sicilian Defense: Smith-Morra Gambit Accepted, Larsen DefenseB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. Qe2 a6 8. O-O Bd6
- Sicilian Defense: Smith-Morra Gambit Accepted, Morphy DefenseB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Bc5
- Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense DeferredB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 a6 7. O-O b5 8. Bb3 Bc5
- Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen FormationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 a6
- Sicilian Defense: Smith-Morra Gambit Accepted, Pin DefenseB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Bb4
- Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen FormationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 e6
- Sicilian Defense: Smith-Morra Gambit Accepted, Siberian VariationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7
- Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation, Siberian TrapB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. Qe2 Nf6 8. O-O Ng4
- Sicilian Defense: Smith-Morra Gambit Accepted, Sozin FormationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 e6 6. Nf3 d6 7. O-O a6 8. Qe2 b5
- Sicilian Defense: Smith-Morra Gambit Accepted, Taimanov FormationB211. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Bc4 a6 6. Nf3 Ne7
- Sicilian Defense: Smith-Morra Gambit Declined, Alapin FormationB211. e4 c5 2. d4 cxd4 3. c3 Nf6
- Sicilian Defense: Smith-Morra Gambit Declined, Center FormationB211. e4 c5 2. d4 cxd4 3. c3 e5
- Sicilian Defense: Smith-Morra Gambit Declined, Dubois VariationB211. e4 c5 2. d4 cxd4 3. c3 d3 4. c4
- Sicilian Defense: Smith-Morra Gambit Declined, Push VariationB211. e4 c5 2. d4 cxd4 3. c3 d3
- Sicilian Defense: Smith-Morra Gambit Declined, Scandinavian FormationB211. e4 c5 2. d4 cxd4 3. c3 d5
- Sicilian Defense: Smith-Morra Gambit Declined, Wing FormationB211. e4 c5 2. d4 cxd4 3. c3 Qa5