The 500 ECO Codes – Full Overview of the Classical Opening System
Flank Openings
A00 Irregular Openings
1.a3, 1.c3, d3, e3, f3, g3, h3, g4, b4, Na3, Nc3, Nh3
A01 Larsen’s Opening
1. b3
A02 Bird’s Opening (Dutch Attack)
1. f4
A03 Bird’s Opening
1. f4 d5
A04 Réti Opening
1. Nf3
A05 Réti Opening
1. Nf3 Nf6
A06 Réti Opening
1. Nf3 d5
A07 Réti Opening King’s Indian Attack (Barcza System)
1. Nf3 d5 2. g3
A08 Réti Opening King’s Indian Attack
1. Nf3 d5 2. g3 c5 3. Bg2
A09 Réti Opening
1. Nf3 d5 2. c4
A10 English Opening
1. c4
A11 English, Caro–Kann defensive system
1. c4 c6
A12 English, Caro–Kann defensive system
1. c4 c6 2. Nf3 d5 3. b3
A13 English Opening
1. c4 e6
A14 English, Neo-Catalan declined
1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. 0-0
A15 English, Anglo-Indian defence
1. c4 Nf6
A16 English Opening
1. c4 Nf6 2. Nc3
A17 English Opening, Hedgehog Defence
1.c4 Nf6 2.Nc3 e6
A18 English, Mikenas–Carls Variation
1.c4 Nf6 2.Nc3 e6 3.e4 d5 4.e5
A19 English, Mikenas–Carls, Sicilian Variation
1. c4 Nf6 2. Nc3 e6 3. e4 c5
A20 English Opening
1.c4 e5
A21 English Opening
1. c4 e5 2. Nc3
A22 English Opening
1. c4 e5 2. Nc3 Nf6
A23 English Opening, Bremen System, Keres Variation
1. c4 e5 2. Nc3 Nf6 3. g3 c6
A24 English Opening, Bremen System with . ..g6
1.c4 e5 2.Nc3 Nf6 3.g3 g6
A25 English Opening, Sicilian Reversed
1. c4 e5 2. Nc3 Nc6
A26 English Opening, Closed System
1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6
A27 English Opening, Three Knights System
1.c4 e5 2.Nc3 Nc6 3.Nf3
A28 English Opening, Four Knights System
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6
A29 English Opening, Four Knights, Kingside Fianchetto
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. g3
A30 English Opening, Symmetrical Defence
1.c4 c5
A31 English Opening, Symmetrical, Anti-Benoni formation
1.c4 c5 2.Nf3 Nf6 3.d4
A32 English Opening, Symmetrical
1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6
A33 English Opening, Symmetrical
1. c4 c5 2. Nf3 Nf6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Nc6
A34 English Opening, Symmetrical
1. c4 c5 2.Nc3
A35 English Opening, Symmetrical
1. c4 c5 2.Nc3 Nc6
A36 English Opening, Symmetrical
1. c4 c5 2. Nc3 Nc6 3. g3
A37 English Opening, Symmetrical
1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3
A38 English Opening, Symmetrical
1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6
A39 English Opening, Symmetrical, Main line with d4
1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. 0-0 0-0 7. d4
A40 Queen’s Pawn Game (including English Defence, Englund Gambit)
1. d4
A41 Queen’s Pawn Game, Wade Defence
1. d4 d6
A42 Modern Defence, Averbakh System also Wade Defence
1. d4 d6 2. c4 g6 3. Nc3 Bg7 4. e4
A43 Old Benoni Defence
1. d4 c5
A44 Old Benoni Defence
1. d4 c5 2. d5 e5
A45 Queen’s Pawn Game
1. d4 Nf6
A46 Queen’s Pawn Game, Torre Attack
1. d4 Nf6 2. Nf3
A47 Queen’s Indian Defence
1.d4 Nf6 2.Nf3 b6
A48 King’s Indian, East Indian Defence
1. d4 Nf6 2. Nf3 g6
A49 King’s Indian, Fianchetto without c4
1. d4 Nf6 2. Nf3 g6 3. g3
A50 Queen’s Pawn Game, Black Knights’ Tango
1. d4 Nf6 2. c4
A51 Budapest Gambit declined
1.d4 Nf6 2.c4 e5
A52 Budapest Gambit
1. d4 Nf6 2. c4 e5 3. dxe5 Ng4
A53 Old Indian Defence (Chigorin Indian Defence)
1. d4 Nf6 2. c4 d6
A54 Old Indian, Ukrainian Variation
1. d4 Nf6 2. c4 d6 3. Nc3 e5
A55 Old Indian, Main line
1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3 Nbd7 5. e4
A56 Benoni Defence
1. d4 Nf6 2. c4 c5
A57 Benko Gambit
1. d4 Nf6 2. c4 c5 3. d5 b5
A58 Benko Gambit Accepted
1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6
A59 Benko Gambit 7.e4
1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. e4
A60 Benoni Defence
1.d4 Nf6 2.c4 c5 3.d5 e6
A61 Benoni Defence
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6
A62 Benoni, Fianchetto Variation
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 Bg7 8. Bg2 0-0
A63 Benoni, Fianchetto Variation, 9…Nbd7
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 Bg7 8. Bg2 0-0 9. 0-0 Nbd7
A64 Benoni, Fianchetto Variation, 11…Re8
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. g3 Bg7 8. Bg2 0-0 9. 0-0 Nbd7 10. Nd2 a6 11. a4 Re8
A65 Benoni, 6.e4
1. d4 Nf6 2 c4 c5 3 d5 e6 4 Nc3 exd5 5 cxd5 d6 6 e4
A66 Benoni, Pawn Storm Variation
1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.e5
A67 Benoni, Taimanov Variation
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Bb5+
A68 Benoni, Four Pawns Attack
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Nf3 0-0
A69 Benoni, Four Pawns Attack, Main line
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Nf3 0-0 9. Be2 Re8
A70 Benoni, Classical with e4 and Nf3
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3
A71 Benoni, Classical, 8.Bg5
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Bg5
A72 Benoni, Classical without 9.0-0
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2
A73 Benoni, Classical, 9.0-0
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0
A74 Benoni, Classical, 9…a6, 10.a4
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0 a6 10. a4
A75 Benoni, Classical with …a6 and 10…Bg4
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0 a6 10. a4 Bg4
A76 Benoni, Classical, 9…Re8
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0 Re8
A77 Benoni, Classical, 9…Re8, 10.Nd2
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0 Re8 10. Nd2
A78 Benoni, Classical with …Re8 and …Na6
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0 Re8 10. Nd2 Na6
A79 Benoni, Classical, 11.f3
1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 0-0 9. 0-0 Re8 10. Nd2 Na6 11. f3
A80 Dutch Defence
1. d4 f5 (all without 2. g3, 2.e4, 2.c4)
A81 Dutch Defence
1. d4 f5 2. g3
A82 Dutch, Staunton Gambit, also includes Balogh Defence
1. d4 f5 2. e4
A83 Dutch, Staunton Gambit, Staunton’s line
1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5
A84 Dutch defence
1. d4 f5 2. c4
A85 Dutch with 2.c4 and 3.Nc3
1. d4 f5 2. c4 Nf6 3. Nc3
A86 Dutch with 2.c4 and 3.g3
1. d4 f5 2. c4 Nf6 3. g3
A87 Dutch, Leningrad, Main Variation
1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3
A88 Dutch, Leningrad, Main Variation with 7…c6
1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 c6
A89 Dutch, Leningrad, Main Variation with Nc6
1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Nc6
A90 Dutch Defence
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2
A91 Dutch Defence
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7
A92 Dutch Defence
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0
A93 Dutch, Stonewall, Botvinnik Variation
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d5 7. b3
A94 Dutch, Stonewall with Ba3
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d5 7. b3 c6 8. Ba3
A95 Dutch, Stonewall with Nc3
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d5 7. b3 c6
A96 Dutch, Classical Variation
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6
A97 Dutch, Ilyin–Genevsky Variation
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Qe8
A98 Dutch, Ilyin–Genevsky Variation with Qc2
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Qe8 8. Qc2
A99 Dutch, Ilyin–Genevsky Variation with b3
1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 0-0 6. 0-0 d6 7. Nc3 Qe8 8. b3