ECO B21: Sicilian Defense & Bird Opening
ECO B21 is part of volume B, Semi-Open Games.
The Lichess chess-openings dataset files 34 named lines under it, from 2 different openings.
The shortest is Sicilian Defense: McDonnell Attack:
1. e4 c5 2. f4.
The most played is
Sicilian Defense: Smith-Morra Gambit,
reached in 27,218,291 rated Lichess games.
That position has come up in 19,955,347 Lichess games between players rated 1600 to 2500: White won 47.3%, 3.9% were drawn and Black won 48.8%.
| Opening | Moves | Games | Length |
|---|---|---|---|
| Sicilian Defense: McDonnell Attack | 1. e4 c5 2. f4 |
20M | 2 moves |
| Sicilian Defense: Smith-Morra Gambit | 1. e4 c5 2. d4 |
27.2M | 2 moves |
| Sicilian Defense: Halasz Gambit | 1. e4 c5 2. d4 cxd4 3. f4 |
154K | 3 moves |
| Sicilian Defense: McDonnell Attack, Toilet Variation | 1. e4 c5 2. f4 d5 3. Nc3 |
119K | 3 moves |
| Sicilian Defense: Morphy Gambit | 1. e4 c5 2. d4 cxd4 3. Nf3 |
3.1M | 3 moves |
| Sicilian Defense: Smith-Morra Gambit | 1. e4 c5 2. d4 cxd4 3. c3 |
14.6M | 3 moves |
| Bird Opening: Dutch Variation, Batavo Gambit | 1. e4 c5 2. f4 d5 3. Nf3 dxe4 |
234K | 3 moves |
| Sicilian Defense: McDonnell Attack, Tal Gambit | 1. e4 c5 2. f4 d5 3. exd5 Nf6 |
281K | 3 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 |
9.2M | 3 moves |
| Sicilian Defense: Smith-Morra Gambit Declined, Alapin Formation | 1. e4 c5 2. d4 cxd4 3. c3 Nf6 |
1.1M | 3 moves |
| Sicilian Defense: Smith-Morra Gambit Declined, Center Formation | 1. e4 c5 2. d4 cxd4 3. c3 e5 |
648K | 3 moves |
| Sicilian Defense: Smith-Morra Gambit Declined, Push Variation | 1. e4 c5 2. d4 cxd4 3. c3 d3 |
1.5M | 3 moves |
| Sicilian Defense: Smith-Morra Gambit Declined, Scandinavian Formation | 1. e4 c5 2. d4 cxd4 3. c3 d5 |
785K | 3 moves |
| Sicilian Defense: Smith-Morra Gambit Declined, Wing Formation | 1. e4 c5 2. d4 cxd4 3. c3 Qa5 |
30K | 3 moves |
| Sicilian Defense: Morphy Gambit, Andreaschek Gambit | 1. e4 c5 2. d4 cxd4 3. Nf3 e5 4. c3 |
197K | 4 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Danish Variation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nf3 |
194K | 4 moves |
| Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation | 1. e4 c5 2. d4 cxd4 3. c3 d3 4. c4 |
130K | 4 moves |
| Sicilian Defense: Coles Sicilian Gambit | 1. e4 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qd1 Nf6 5. Bc4 |
9,218 | 5 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Fianchetto Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 g6 |
560K | 5 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Kan Formation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Nf3 a6 |
649K | 5 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Bc5 |
99K | 6 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen Formation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 a6 |
956K | 6 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Pin Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Bb4 |
576K | 6 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen Formation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 e6 |
867K | 6 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 |
119K | 6 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Taimanov Formation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Bc4 a6 6. Nf3 Ne7 |
46K | 6 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 d6 5. Nf3 e6 6. Bc4 Nf6 7. O-O a6 |
77K | 7 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Classical Formation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 a6 7. O-O Nf6 |
186K | 7 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Finegold Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Nf3 d6 6. Bc4 a6 7. O-O Be7 8. Qe2 Nf6 |
85K | 8 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Larsen Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. Qe2 a6 8. O-O Bd6 |
9,689 | 8 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense Deferred | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 a6 7. O-O b5 8. Bb3 Bc5 |
13K | 8 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation, Siberian Trap | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. Qe2 Nf6 8. O-O Ng4 |
47K | 8 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Sozin Formation | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 e6 6. Nf3 d6 7. O-O a6 8. Qe2 b5 |
31K | 8 moves |
| Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense | 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 e6 6. Nf3 d6 7. O-O a6 8. Qe2 b5 9. Bb3 Ra7 |
16K | 9 moves |