ECO C00
42 named openings and variations are classified as C00. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- French DefenseC001. e4 e6
- French Defense: Alapin GambitC001. e4 e6 2. d4 d5 3. Be3
- French Defense: Baeuerle GambitC001. e4 e6 2. d4 b5
- French Defense: Banzai-Leong GambitC001. e4 e6 2. b4
- French Defense: Banzai-Leong Gambit, Pinova GambitC001. e4 e6 2. b4 Bxb4 3. e5
- French Defense: Bird InvitationC001. e4 e6 2. Bb5
- French Defense: Carlson GambitC001. e4 e6 2. d4 d5 3. Nf3 dxe4 4. Ne5
- French Defense: Chigorin VariationC001. e4 e6 2. Qe2
- French Defense: Diemer-Duhm GambitC001. e4 e6 2. d4 d5 3. c4
- French Defense: Diemer-Duhm Gambit AcceptedC001. e4 e6 2. d4 d5 3. c4 dxe4
- French Defense: Franco-Hiva GambitC001. e4 e6 2. d4 f5
- French Defense: Franco-Hiva Gambit AcceptedC001. e4 e6 2. d4 f5 3. exf5
- French Defense: Franco-Sicilian DefenseC001. e4 e6 2. d4 c5
- French Defense: Hoffmann GambitC001. e4 e6 2. d4 d5 3. Qe2 e5 4. f4 exf4
- French Defense: Horwitz AttackC001. e4 e6 2. b3
- French Defense: Horwitz Attack, Papa-Ticulat GambitC001. e4 e6 2. b3 d5 3. Bb2
- French Defense: King's Indian AttackC001. e4 e6 2. d3
- French Defense: King's Indian Attack, Franco-Hiva GambitC001. e4 e6 2. d3 f5
- French Defense: Knight VariationC001. e4 e6 2. Nf3
- French Defense: Knight Variation, Franco-Hiva GambitC001. e4 e6 2. Nf3 f5
- French Defense: La Bourdonnais VariationC001. e4 e6 2. f4
- French Defense: La Bourdonnais Variation, Reuter GambitC001. e4 e6 2. f4 d5 3. Nf3 dxe4
- French Defense: Mediterranean DefenseC001. e4 e6 2. d4 Nf6
- French Defense: Morphy GambitC001. e4 e6 2. d4 d5 3. Nh3
- French Defense: Normal VariationC001. e4 e6 2. d4
- French Defense: Orthoschnapp GambitC001. e4 e6 2. c4 d5 3. cxd5 exd5 4. Qb3
- French Defense: Pelikan VariationC001. e4 e6 2. Nc3 d5 3. f4
- French Defense: Perseus GambitC001. e4 e6 2. d4 d5 3. Nf3
- French Defense: Queen's KnightC001. e4 e6 2. Nc3
- French Defense: Reversed Philidor FormationC001. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 Nc6 5. Be2
- French Defense: Réti-Spielmann AttackC001. e4 e6 2. g3
- French Defense: Schlechter VariationC001. e4 e6 2. d4 d5 3. Bd3
- French Defense: St. George DefenseC001. e4 e6 2. d4 a6
- French Defense: St. George Defense, Sanky-George GambitC001. e4 e6 2. d4 a6 3. c4 b5
- French Defense: St. George Defense, St. George GambitC001. e4 e6 2. d4 a6 3. c4 b5 4. cxb5 axb5
- French Defense: St. George Defense, Three Pawn AttackC001. e4 e6 2. d4 a6 3. c4
- French Defense: St. George Defense, Traditional LineC001. e4 e6 2. d4 a6 3. Nf3 b5 4. Bd3 c5 5. c3 Bb7 6. O-O Nf6
- French Defense: Steiner VariationC001. e4 e6 2. c4
- French Defense: Steinitz AttackC001. e4 e6 2. e5
- French Defense: Two Knights VariationC001. e4 e6 2. Nf3 d5 3. Nc3
- French Defense: Wing GambitC001. e4 e6 2. Nf3 d5 3. e5 c5 4. b4
- Rat Defense: Small Center DefenseC001. d4 e6 2. e4 d6