ECO Codes

The ECO Codes is a classification system for the chess openings moves. Below is a list of chess openings organized by the Encyclopaedia of Chess Openings (ECO) code. The openings are divided in five volumes labeled from "A" through "E".

C00 French defence

1. e4 e6
- C00 French defence, Steiner variation
  1. e4 e6 2. c4
- C00 French, Reti (Spielmann) variation
  1. e4 e6 2. b3
- C00 French, Steinitz attack
  1. e4 e6 2. e5
- C00 French, Labourdonnais variation
  1. e4 e6 2. f4
- C00 French defence
  1. e4 e6 2. Nf3
- C00 French, Wing gambit
  1. e4 e6 2. Nf3 d5 3. e5 c5 4. b4
- C00 French defence
  1. e4 e6 2. Nc3
- C00 French, Pelikan variation
  1. e4 e6 2. Nc3 d5 3. f4
- C00 French, Two knights variation
  1. e4 e6 2. Nc3 d5 3. Nf3
- C00 French, Chigorin variation
  1. e4 e6 2. Qe2
- C00 French, King's Indian attack
  1. e4 e6 2. d3
- C00 French, Reversed Philidor formation
  1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 Nc6 5. Be2
- C00 French defence
  1. e4 e6 2. d4
- C00 Lengfellner system
  1. e4 e6 2. d4 d6
- C00 St. George defence
  1. e4 e6 2. d4 a6
- C00 French defence
  1. e4 e6 2. d4 d5
- C00 French, Schlechter variation
  1. e4 e6 2. d4 d5 3. Bd3
- C00 French, Alapin variation
  1. e4 e6 2. d4 d5 3. Be3
C01 French, exchange variation

1. e4 e6 2. d4 d5 3. exd5
- C01 French, exchange, Svenonius variation
  1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 Nf6 5. Bg5
- C01 French, exchange, Bogolyubov variation
  1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 Nf6 5. Bg5 Nc6
C02 French, advance variation

1. e4 e6 2. d4 d5 3. e5
- C02 French, advance, Steinitz variation
  1. e4 e6 2. d4 d5 3. e5 c5 4. dxc5
- C02 French, advance, Nimzovich variation
  1. e4 e6 2. d4 d5 3. e5 c5 4. Qg4
- C02 French, advance, Nimzovich system
  1. e4 e6 2. d4 d5 3. e5 c5 4. Nf3
- C02 French, advance variation
  1. e4 e6 2. d4 d5 3. e5 c5 4. c3
- C02 French, advance, Wade variation
  1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. Nf3 Bd7
- C02 French, advance variation
  1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6
- C02 French, advance, Paulsen attack
  1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3
- C02 French, advance, Milner-Barry gambit
  1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3
- C02 French, advance, Euwe variation
  1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7
C03-C09 French, Tarrasch

1. e4 e6 2. d4 d5 3. Nd2
C10 French, Paulsen variation

1. e4 e6 2. d4 d5 3. Nc3
- C10 French, Marshall variation
  1. e4 e6 2. d4 d5 3. Nc3 c5
- C10 French, Rubinstein variation
  1. e4 e6 2. d4 d5 3. Nc3 dxe4
- C10 French, Fort Knox variation
  1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bd7 5. Nf3 Bc6
- C10 French, Rubinstein variation
  1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7
- C10 French, Rubinstein, Capablanca line
  1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Nxf6+ Nxf6 7. Ne5
- C10 French, Frere (Becker) variation
  1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Qd5
C11 French defence

1. e4 e6 2. d4 d5 3. Nc3 Nf6
- C11 French, Swiss variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bd3
- C11 French, Henneberger variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Be3
- C11 French, Steinitz variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5
- C11 French, Steinitz, Bradford attack
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Bxc5 7. Qg4
- C11 French, Steinitz variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6
- C11 French, Steinitz, Brodsky-Jones variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6 7. a3 Bxc5 8. Qg4 O-O 9. Nf3 f6
- C11 French, Steinitz variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3
- C11 French, Steinitz, Boleslavsky variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3
- C11 French, Steinitz, Gledhill attack
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. Qg4
- C11 French, Burn variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4
C12 French, MacCutcheon variation

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4
- C12 French, MacCutcheon, Bogolyubov variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. exd5 Qxd5 6. Bxf6 gxf6 7. Qd2 Qa5
- C12 French, MacCutcheon, advance variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5
- C12 French, MacCutcheon, Chigorin variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. exf6
- C12 French, MacCutcheon, Grigoriev variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. exf6 hxg5 7. fxg7 Rg8 8. h4 gxh4 9. Qg4
- C12 French, MacCutcheon, Bernstein variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bh4
- C12 French, MacCutcheon, Janowski variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Be3
- C12 French, MacCutcheon, Dr. Olland (Dutch) variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bc1
- C12 French, MacCutcheon, Tartakower variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Nfd7
- C12 French, MacCutcheon, Lasker variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3
- C12 French, MacCutcheon, Duras variation
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4 Kf8 9. Bc1
- C12 French, MacCutcheon, Lasker variation, 8...g6
  1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4 g6
C13-C14 French, classical

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7
C15-C19 French, Winawer

1. e4 e6 2. d4 d5 3. Nc3 Bb4

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