ECO Codes
The Encyclopaedia of Chess Openings includes an alphanumeric classification system for openings that is widely used in chess literature. Codes C00 to C19 are the French Defence, broken up in the following way (all apart from C00 start with the moves 1.e4 e6 2.d4 d5):
- C00 - 1.e4 e6 without 2.d4 (early deviations)
- C01 - 2.d4 d5 (includes the Exchange Variation, 3.exd5)
- C02 - 3.e5 (Advance Variation)
- C03 - 3.Nd2 (includes 3...Be7; C03–C09 cover the Tarrasch Variation)
- C04 - 3.Nd2 Nc6 (Guimard Variation)
- C05 - 3.Nd2 Nf6
- C06 - 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3
- C07 - 3.Nd2 c5 (includes 4.exd5 Qxd5)
- C08 - 3.Nd2 c5 4.exd5 exd5
- C09 - 3.Nd2 c5 4.exd5 exd5 5.Ngf3 Nc6
- C10 - 3.Nc3 (includes the Rubinstein Variation, 3...dxe4)
- C11 - 3.Nc3 Nf6 (includes the Steinitz Variation, 4.e5; C11–C14 cover the Classical Variation)
- C12 - 3.Nc3 Nf6 4.Bg5 (includes the McCutcheon Variation, 4...Bb4)
- C13 - 3.Nc3 Nf6 4.Bg5 dxe4 (Burn Variation)
- C14 - 3.Nc3 Nf6 4.Bg5 Be7
- C15 - 3.Nc3 Bb4 (C15–C19 cover the Winawer Variation)
- C16 - 3.Nc3 Bb4 4.e5
- C17 - 3.Nc3 Bb4 4.e5 c5
- C18 - 3.Nc3 Bb4 4.e5 c5 5.a3 (includes the Armenian Variation, 5...Ba5)
- C19 - 3.Nc3 Bb4 4 e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Nf3 and 7.a4
Read more about this topic: French Defence
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