This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system.
The chess openings are categorised into five broad areas ("A" through "E"), with each of those broken up into one hundred subcategories ("00" through "99").
A03 Bird's Opening, Dutch Variation:
A05 Réti Opening: 1...Nf6 A06 Réti Opening: 1...d5 A07 Réti Opening, King's Indian Attack (Barcza System): A08 Réti Opening, King's Indian Attack: A09 Réti Opening: 1.c4: English Opening A10: 1.c4 (without: 1...g6 2.d4, 1...f5 2.d4, 1...b6 2.d4, 1...d6 2.e4, 1...d6 2.d4, 1...Nc6 2.d4) A11 English, Caro–Kann defensive system, 1...c6 (without: 2.e4, 2.d4) A12 English, Caro–Kann defensive system: 2.Nf3 d5 3.b3 A13 English Opening: 1...e6 (without 2.e4 or 2.d4) A14 English, Neo-Catalan Declined: 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 A15 English, Anglo-Indian Defence: 1...Nf6 (without: 2.d4, 2.g3 c6, 2.g3 e5, 2.Nf3 c5, 2.Nf3 e6, 2.Nf3 c6) A16 English Opening, Anglo-Indian Defence: 2.Nc3 (without: 2...c5, 2...e5, 2...e6) A17 English Opening, Hedgehog Defence: 2...e6 (without: 3.d4, 3.Nf3 c5, 3...d5 4.d4, 3...b5 4.d4, 3...Bb4 4.d4) A18 English, Mikenas–Carls Variation: 3.e4 (without: 3...c5) A19 English, Mikenas–Carls, Sicilian Variation: 3...c5 A20 English Opening: 1...e5 (without: 2.e4, 2.Nf3 Nc6 3.Nc3, 2.Nf3 Nf6 3.Nc3, 2.Nf3 d6 3.Nc3) A21 English Opening: 2.Nc3 (without: 2...Nf6, 2...Nc6, 2...Bb4 3.g3 Nf6, 2...Bb4 3.Nf3 Nc6 2...Bb4 3.e3 Nf6) A22 English Opening: 2...Nf6 (without: 3.Nf3 Nc6, 3.e3 Nc6, 3.g3 Nc6, 3.g3 c6, 3.g3 g6, 3.e4 Nc6 4.Nf3) A23 English Opening, Bremen System, Keres Variation: 3.g3 c6 A24 English Opening, Bremen System with 1...e5 2.Nc3 Nf6 3.g3 g6 (without: 4.Bg2 Bg7 5.d3 d6): 3.g3 g6 A25 English Opening, Sicilian Reversed: 2...Nc6 (without 3.e3 Nf6 4.Nf3) A26 English Opening, Closed System: 3.g3 g6 4.Bg2 Bg7 5.d3 d6 A27 English Opening, Three Knights System: 3.Nf3 (without: 3...Nf6) A28 English Opening, Four Knights System: 3...Nf6 (without 4.g3) A29 English Opening, Four Knights, Kingside Fianchetto: 4.g3 A30 English Opening, Symmetrical Defence: 1...c5 (without: 2.e4, 2.g3 g6 3.Nc3, 2.g3 Nc6 3.Nc3, 2.Nf3 Nc6 3.Nc3, 2.e3 Nf6 4.d4) A31 English Opening, Symmetrical, Benoni formation: 2.Nf3 Nf6 3.d4 (without: 3...cxd4 4.Nxd4 e6, 3...cxd4 4.Nxd4 a6 5.Nc3 e6, 3...cxd4 4.Nxd4 Nc6 5.Nc3 e6) A32 English Opening, Symmetrical: 3...cxd4 4.Nxd4 e6 A33 English Opening, Symmetrical: 5.Nc3 Nc6 A34 English Opening, Symmetrical: 2.Nc3 (without 2...Nc6, 2...Nf6 3.Nf3 Nc6, 2...Nf6 3.e4 e6, 2...e6 3.Nf3 Nf6, 4.g3 Nc6) A35 English Opening, Symmetrical: 2...Nc6 (without 3.g3, 3.e4, 3.Nf3 Nf6, 4.g3 e6, 3.Nf3 Nf6 4.d4 cxd4 5.Nxd4, 3.Nf3 e5 4.g3 g6 5.Bg2 Bg7) A36 English Opening, Symmetrical: 3.g3 A37 English Opening, Symmetrical: 3...g6 4.Bg2 Bg7 5.Nf3 A38 English Opening, Symmetrical: 5...Nf6 A39 English, symmetrical, main line with d4: 6.0-0 0-0 7.d4 or 6.d4 cxd4 7.Nxd4 0-0 8.0-0 1.d4 without 1...d5, 1...Nf6 or 1...f5: Atypical replies to 1.d4 A40 Queen's Pawn Game A41 Queen's Pawn Game: 1...d6 A42 Modern Defence, Averbakh System, also Wade Defence: 2.c4 g6 3.Nc3 Bg7 4.e4 A43 Old Benoni Defence: 1...c5 A44 Old Benoni Defence: 2.d5 e5 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 A45 Queen's Pawn Game, Trompowsky Attack: 1.d4 Nf6 (without 2.Nf3) A46 Queen's Pawn Game, Torre Attack: 2.Nf3 A47 Queen's Indian Defence: 2...b6 A48 King's Indian, East Indian Defence: 2...g6 A49 King's Indian, Fianchetto without c4: 3.g3 1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems A50 Queen's Pawn Game: 1. d4 Nf6 2.c4 (without 2...d6 2...e5, 2...e6, 2...g6 or 2...c5) A51 Budapest Gambit Declined: 2...e5 A52 Budapest Gambit: 3.dxe5 Ng4 A53 Old Indian Defence: 2...d6 A54 Old Indian, Ukrainian Variation: 3.Nc3 e5 A55 Old Indian, Main line: 4.Nf3 Nbd7 5.e4 Benoni Defence (and Benko Gambit): 1.d4 Nf6 2.c4 c5 A56 Benoni Defence: 1.d4 Nf6 2.c4 c5 A57 Benko Gambit: 3.d5 b5 A58 Benko Gambit Accepted: 4.cxb5 a6 5.bxa6 A59 Benko Gambit, 7.e4: 5...Bxa6 6.Nc3 d6 7.e4 A60 Benoni Defence: 3.d5 e6 A61 Benoni Defence: 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 A62 Benoni, Fianchetto Variation without 9...Nbd7: 7.g3 Bg7 8.Bg2 0-0 A63 Benoni, Fianchetto Variation, 9...Nbd7: 9.Nbd7 A64 Benoni, Fianchetto Variation, 11...Re8: 9...Nbd7: 10.Nd2 a6 11.a4 Re8 A65 Benoni, 6.e4: 4.Nc3 exd5 5.cxd5 d6 6.e4 A66 Benoni, Pawn Storm Variation: 6...g6 7.f4 A67 Benoni, Taimanov Variation: 7...Bg7 8.Bb5+ A68 Benoni, Four Pawns Attack: 7...Bg7 8.Nf3 0-0 A69 Benoni, Four Pawns Attack, Main line: 9.Be2 Re8 A70 Benoni, Classical with e4 and Nf3: 6...g6 7.Nf3 A71 Benoni, Classical, 8.Bg5: 7... Bg7 8.Bg5 A72 Benoni, Classical without 9.0-0: 7...Bg7 8.Be2 0-0 A73 Benoni, Classical, 9.0-0: 9.0-0 A74 Benoni, Classical, 9...a6, 10.a4: 9...a6 10.a4 A75 Benoni, Classical with 9...a6 and 10...Bg4: 9...a6 10.a4 Bg4 A76 Benoni, Classical, 9...Re8: 9...Re8 A77 Benoni, Classical, 9...Re8, 10.Nd2: 10.Nd2 A78 Benoni, Classical with 9...Re8 and 10...Na6: 10...Na6 A79 Benoni, Classical, 11.f3: 11.f3 Dutch Defence: 1.d4 f5 A80 Dutch Defence: 1.d4 f5 A81 Dutch Defence: 2.g3 A82 Dutch, Staunton Gambit 2.e4 A83 Dutch, Staunton Gambit, Staunton's line 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 A84 Dutch Defence 2.c4: 2.c4 A85 Dutch with 2.c4 Nf6 3.Nc3: 2... Nf6 3.Nc3 A86 Dutch with 2.c4 Nf6 3.g3: 2... Nf6 3.g3 A87 Dutch, Leningrad, Main Variation: 3...g6 4.Bg2 Bg7 5.Nf3 A88 Dutch, Leningrad, Main Variation with 5...0-0 6.0-0 d6 7.Nc3 c6: 5...0-0 6.0-0 d6 7.Nc3 c6 A89 Dutch, Leningrad, Main Variation with 5...0-0 6.0-0 d6 7.Nc3 Nc6: 5...0-0 6.0-0 d6 7.Nc3 Nc6 A90 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2: 3...e6 4.Bg2 A91 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7: 4...Be7 A92 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0: 5.Nf3 0-0 A93 Dutch, Stonewall, Botvinnik Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7. b3: 6.0-0 d5 7. b3 A94 Dutch, Stonewall with 6.0-0 d5.7.b3 c6 8.Ba3: 7... c6 8.Ba3 A95 Dutch, Stonewall with 6.0-0 d5.7.Nc3 c6: 6.0-0 d5 7.Nc3 c6 A96 Dutch, Classical Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6: 6.0-0 d6 A97 Dutch, Ilyin–Genevsky Variation 7.Nc3 Qe8: 7.Nc3 Qe8 A98 Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.Qc2: 8.Qc2 A99 Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.b3: 8.b3 1.e4 without 1...c5, 1...e6 or 1...e5 B00 King's Pawn Opening without 1...e5, 1...e6, 1...d5, 1...Nf6, 1...g6, 1...d6, 1...c6, 1...c5.
Also, particularly amongst strong players, an increased use of the English Opening for White.