Openings
1,811 openings in the database
Browse the full opening catalog. Search by name or ECO code (e.g. “Najdorf” or “B90”), or filter by volume A–E. Click any opening to see its position on the board and the grandmaster videos played in that line.
Why do so many openings share the same code? (how ECO works)
Every chess opening is filed under one of just 500 ECO codes(A00–E99), grouped into five volumes:
- A — Flank openings (English 1.c4, 1.Nf3, irregular lines)
- B — Semi-open games except the French (Sicilian, Caro-Kann…)
- C — Open games 1.e4 e5 and the French 1.e4 e6
- D — Closed & semi-closed 1.d4 d5 (Queen’s Gambit, Grünfeld…)
- E — Indian defences (Nimzo-Indian, King’s Indian…)
A single code is a family: e.g. C50 covers the whole Italian Game / Giuoco Piano complex, so the Giuoco Piano, Giuoco Pianissimo, Hungarian Defense and Two Knights all live under C50. That’s why one code maps to many named variations — the code is the family, the name is the specific line. ChessEyes shows you both.
E91King's Indian Defense: Orthodox Variation11 plyE92King's Indian Defense: Exchange Variation13 plyE92King's Indian Defense: Orthodox Variation12 plyE92King's Indian Defense: Petrosian Variation13 plyE93King's Indian Defense: Petrosian Variation14 plyE94King's Indian Defense: Orthodox Variation13 plyE95King's Indian Defense: Orthodox Variation15 plyE96King's Indian Defense: Orthodox Variation18 plyE97King's Indian Defense: Orthodox Variation14 plyE98King's Indian Defense: Orthodox Variation17 plyE99King's Indian Defense: Orthodox Variation20 ply