ECO C22
7 named openings and variations are classified as C22. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Center Game: Berger VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Nf6
- Center Game: Charousek VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Bb4+ 5. c3 Be7
- Center Game: Hall VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4
- Center Game: Kupreichik VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Nf6 5. Nc3 Bb4 6. Bd2 O-O 7. O-O-O Re8 8. Bc4 d6 9. Nh3
- Center Game: Normal VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6
- Center Game: Paulsen Attack VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3
- Center Game: l'Hermet VariationC221. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 f5