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The ECO Codes is a clasification 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'.

A00-A99
  • White first moves other than 1.e4, 1.d4 (A00–A39)
  • 1.d4 without 1...d5 or 1...Nf6: Atypical replies to 1.d4 (A40–A44)
  • 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45–A49)
  • 1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems (A50–A79)
  • 1.d4 f5: Dutch Defence (A80–A99)
  • B00-B99
  • 1.e4 without 1...c5, 1...e6 or 1...e5 (B00–B19)
  • 1.e4 c5: Sicilian Defence (B20–B99)
  • C00-C99
  • 1.e4 e6: French Defence (C00–C19)
  • 1.e4 e5: Open Game (C20–C99)
  • D00-D99
  • 1.d4 d5: Closed Game (D00–D69)
  • 1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence (D70–D99)
  • E00-E99
  • 1.d4 Nf6 2.c4 e6: Indian systems with ...e6 (E00–E59)
  • 1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld) (E60–E99)



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