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A00 to E99

This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code. In 1966, Chess Informant categorised the chess openings into five broad areas ("A" through "E"), with each of those broken down into one hundred subcategories ("00" through "99"). The openings were published in five volumes of Encyclopaedia of Chess Openings, with volumes labeled "A" through "E". This is a list of chess openings by the ECO classification.



  • 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)

[edit] A00-A39

White first moves other than 1. e4, 1. d4:

  • A01 Larsen's Opening, 1. b3 (Owen's Opening) (Greek Attack)
  • A02 Bird's Opening, 1. f4 (Dutch Attack)
  • A03 Bird's Opening, 1...d5
  • A04 Réti Opening, 1. Nf3
  • A05 Réti Opening, 2...Nf6
  • A06 Réti Opening, 2...d5
  • A07 Réti Opening, King's Indian Attack (Barcza System)
  • A08 Réti Opening, King's Indian Attack
  • A09 Réti Opening, 2...d5 3.c4
  • A10 English Opening: 1. c4
  • A11 English, Caro-Kann defensive system
  • A12 English, Caro-Kann defensive system
  • A13 English Opening
  • A14 English, Neo-Catalan declined
  • A15 English, 1...Nf6 (Anglo-Indian defence)
  • A16 English Opening
  • A17 English Opening, Hedgehog Defence
  • A18 English, Mikenas-Carls Variation
  • A19 English, Mikenas-Carls, Sicilian Variation
  • A20 English Opening
  • A21 English Opening
  • A22 English Opening
  • A23 English Opening, Bremen System, Keres Variation
  • A24 English Opening, Bremen System with 3...g6
  • A25 English Opening, Sicilian Reversed
  • A26 English Opening, Closed System
  • A27 English Opening, Three knights system
  • A28 English Opening, Four knights system
  • A29 English Opening, Four knights, kingside Fianchetto
  • A30 English Opening, Symmetrical Variation
  • A31 English Opening, Symmetrical, Benoni formation
  • A32 English Opening, Symmetrical
  • A33 English Opening, Symmetrical
  • A34 English Opening, Symmetrical
  • A35 English Opening, Symmetrical
  • A36 English Opening, Symmetrical
  • A37 English Opening, Symmetrical
  • A38 English Opening, Symmetrical
  • A39 English Opening, Symmetrical, Main line with d4

[edit] A40-A44

1. d4 without 1...d5 or 1...Nf6: Atypical replies to 1. d4 (A40-A44)

[edit] A45-A49

1. d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45-A49)

[edit] A50-A79

1. d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems (A50-A79)

[edit] A80-A99

1. d4 f5: Dutch Defence (A80-A99)

  • A80 Dutch Defence
  • A81 Dutch Defence
  • A82 Dutch, Staunton Gambit, also includes Balogh Defence
  • A83 Dutch, Staunton Gambit, Staunton's line
  • A84 Dutch defence
  • A85 Dutch with 2.c4 & 3.Nc3
  • A86 Dutch with 2.c4 & 3.g3
  • A87 Dutch, Leningrad, Main Variation
  • A88 Dutch, Leningrad, Main Variation with 7...c6
  • A89 Dutch, Leningrad, Main Variation with Nc6
  • A90 Dutch Defence
  • A91 Dutch Defence
  • A92 Dutch Defence
  • A93 Dutch, Stonewall, Botvinnik Variation
  • A94 Dutch, Stonewall with Ba3
  • A95 Dutch, Stonewall with Nc3
  • A96 Dutch, Classical Variation
  • A97 Dutch, Ilyin-Genevsky Variation
  • A98 Dutch, Ilyin-Genevsky Variation with Qc2
  • A99 Dutch, Ilyin-Genevsky Variation with b3

[edit] B

  • 1. e4 without 1...c5, 1...e6 or 1...e5 (B00-B19)
  • 1. e4 c5: Sicilian Defence (B20-B99)

[edit] B00-B19

1. e4 without 1...c5, 1...e6 or 1...e5 (B00-B19)

[edit] B20-B99

1. e4 c5: Sicilian Defence (B20-B99)

[edit] C

[edit] C00-C19

1. e4 e6: French Defence (C00-C19)

  • C00 French Defence
  • C01 French, Exchange Variation, Kingston Defence
  • C02 French, Advance Variation
  • C03 French, Tarrasch
  • C04 French, Tarrasch, Guimard Main line
  • C05 French, Tarrasch, Closed Variation
  • C06 French, Tarrasch, Closed Variation, Main line
  • C07 French, Tarrasch, Open Variation
  • C08 French, Tarrasch, Open, 4.exd5 exd5
  • C09 French, Tarrasch, Open Variation, Main line
  • C10 French, Paulsen Variation
  • C11 French Defence
  • C12 French, MacCutcheon Variation
  • C13 French, Classical
  • C14 French, Classical Variation
  • C15 French, Winawer (Nimzovich) Variation
  • C16 French, Winawer, Advance Variation
  • C17 French, Winawer, Advance Variation
  • C18 French, Winawer, Advance Variation
  • C19 French, Winawer, Advance, 6...Ne7

[edit] C20-C99

1. e4 e5: Open Game (C20-C99)

[edit] D

[edit] D00-D69

1. d4 d5: Closed Game (D00-D69)

  • D00 Queen's Pawn Game (including Blackmar-Diemer Gambit, Halosar Trap and others)
  • D01 Richter-Veresov Attack
  • D02 Queen's Pawn Game, 2. Nf3
  • D03 Torre Attack, Tartakower Variation
  • D04 Queen's Pawn Game
  • D05 Queen's Pawn Game, Zukertort Variation (including Colle system)
  • D06 Queen's Gambit (including the Baltic Defence, Marshall Defence and Symmetrical Defence)
  • D07 QGD; Chigorin Defence
  • D08 QGD; Albin Countergambit and Lasker Trap
  • D09 QGD; Albin Countergambit, 5.g3
  • D10 QGD; Slav Defence
  • D11 QGD; Slav Defence, 3.Nf3
  • D12 QGD; Slav Defence, 4.e3 Bf5
  • D13 QGD; Slav Defence, Exchange Variation
  • D14 QGD; Slav Defence, Exchange Variation
  • D15 QGD; Slav, 4.Nc3
  • D16 QGD; Slav accepted, Alapin Variation
  • D17 QGD; Slav Defence, Czech Defence
  • D18 QGD; Dutch Variation
  • D19 QGD; Dutch Variation
  • D20 Queen's Gambit Accepted
  • D21 QGA, 3.Nf3
  • D22 QGA; Alekhine Defence
  • D23 Queen's Gambit Accepted
  • D24 QGA, 4.Nc3
  • D25 QGA, 4.e3
  • D26 QGA; Classical Variation
  • D27 QGA; Classical Variation
  • D28 QGA; Classical Variation 7.Qe2
  • D29 QGA; Classical Variation 8...Bb7
  • D30 Queen's Gambit Declined: Orthodox Defence
  • D31 QGD, 3.Nc3
  • D31 QGD, Semi-Slav, Abrahams–Noteboom Variation 10...Bb7
  • D32 QGD; Tarrasch Defence
  • D33 QGD; Tarrasch, Schlechter-Rubinstein System
  • D34 QGD; Tarrasch, 7...Be7
  • D35 QGD; Exchange Variation
  • D36 QGD; Exchange, positional line, 6.Qc2
  • D37 QGD; 4.Nf3
  • D38 QGD; Ragozin Variation
  • D39 QGD; Ragozin, Vienna Variation
  • D40 QGD; Semi-Tarrasch defence
  • D41 QGD; Semi-Tarrasch, 5.cxd5
  • D42 QGD; Semi-Tarrasch, 7.Bd3
  • D43 QGD; Semi-Slav Defence
  • D44 QGD; Semi-Slav 5.Bg5 dxc4
  • D45 QGD; Semi-Slav 5.e3
  • D46 QGD; Semi-Slav 6.Bd3
  • D47 QGD; Semi-Slav 7.Bc4
  • D48 QGD; Meran, 8...a6
  • D49 QGD; Meran, 11.Nxb5
  • D50 QGD; 4.Bg5
  • D51 QGD; 4.Bg5 Nbd7 (Cambridge Springs Defence and Elephant Trap)
  • D52 QGD
  • D53 QGD; 4.Bg5 Be7
  • D54 QGD; Anti-neo-Orthodox Variation
  • D55 QGD; 6.Nf3
  • D56 QGD; Lasker Defence
  • D57 QGD; Lasker Defence, Main line
  • D58 QGD; Tartakower (Makogonov-Bondarevsky) System
  • D59 QGD; Tartakower (Makogonov-Bondarevsky) System, 8.cxd5 Nxd5
  • D60 QGD; Orthodox Defence
  • D61 QGD; Orthodox Defence, Rubinstein Variation
  • D62 QGD; Orthodox Defence, 7.Qc2 c5, 8.cxd5 (Rubinstein)
  • D63 QGD; Orthodox Defence, 7.Rc1
  • D64 QGD; Orthodox Defence, Rubinstein Attack (with Rc1)
  • D65 QGD; Orthodox Defence, Rubinstein Attack, main line
  • D66 QGD; Orthodox Defence, Bd3 line including Rubinstein Trap
  • D67 QGD; Orthodox Defence, Bd3 line, Capablanca freeing manoeuvre
  • D68 QGD; Orthodox Defence, Classical Variation
  • D69 QGD; Orthodox Defence, Classical, 13.dxe5

[edit] D70-D99

1. d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence (D70-D99)

  • D70 Neo-Grünfeld Defence
  • D71 Neo-Grünfeld, 5.cxd5
  • D72 Neo-Grünfeld, 5.cxd5, Main line
  • D73 Neo-Grünfeld, 5.Nf3
  • D74 Neo-Grünfeld, 6.cxd5 Nxd5, 7.O-O
  • D75 Neo-Grünfeld, 6.cxd5 Nxd5, 7.O-O c5, 8.Nc3
  • D76 Neo-Grünfeld, 6.cxd5 Nxd5, 7.O-O Nb6
  • D77 Neo-Grünfeld, 6.O-O
  • D78 Neo-Grünfeld, 6.O-O c6
  • D79 Neo-Grünfeld, 6.O-O, Main line
  • D80 Grünfeld Defence
  • D81 Grünfeld; Russian Variation
  • D82 Grünfeld 4.Bf4
  • D83 Grünfeld Gambit
  • D84 Grünfeld Gambit accepted
  • D85 Grünfeld, Nadanian Variation
  • D86 Grünfeld, Exchange, Classical Variation
  • D87 Grünfeld, Exchange, Spassky Variation
  • D88 Grünfeld, Spassky Variation, Main line, 10...cxd4, 11. cxd4
  • D89 Grünfeld, Spassky Variation, Main line, 13.Bd3
  • D90 Grünfeld, Three knights variation
  • D91 Grünfeld, Three knights variation
  • D92 Grünfeld, 5.Bf4
  • D93 Grünfeld with 5.Bf4 O-O 6.e3
  • D94 Grünfeld, 5.e3
  • D95 Grünfeld with 5.e3 O-O 6.Qb3
  • D96 Grünfeld, Russian Variation
  • D97 Grünfeld, Russian Variation with 7.e4
  • D98 Grünfeld, Russian, Smyslov Variation
  • D99 Grünfeld Defence, Smyslov, Main line

[edit] E

  • 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)

[edit] E00-E59

1. d4 Nf6 2.c4 e6: Indian systems with ...e6 (E00-E59)

  • E00 Queen's Pawn Game (including Neo-Indian Attack, Trompowski Attack, Catalan Opening and others)
  • E01 Catalan, closed
  • E02 Catalan, open, 5.Qa4
  • E03 Catalan, open, Alekhine Variation
  • E04 Catalan, Open, 5.Nf3
  • E05 Catalan, Open, Classical line
  • E06 Catalan, Closed, 5.Nf3
  • E07 Catalan, Closed, 6...Nbd7
  • E08 Catalan, Closed, 7.Qc2
  • E09 Catalan, Closed, Main line
  • E10 Queen's Pawn Game 3.Nf3
  • E11 Bogo-Indian Defence
  • E12 Queen's Indian Defence
  • E13 Queen's Indian, 4.Nc3, Main line
  • E14 Queen's Indian, 4.e3
  • E15 Queen's Indian, 4.g3
  • E16 Queen's Indian, Capablanca Variation
  • E17 Queen's Indian, 5.Bg2 Be7
  • E18 Queen's Indian, Old Main line, 7.Nc3
  • E19 Queen's Indian, Old Main line, 9.Qxc3
  • E20 Nimzo-Indian Defence
  • E21 Nimzo-Indian, Three knights variation
  • E22 Nimzo-Indian, Spielmann Variation
  • E23 Nimzo-Indian, Spielmann, 4...c5, 5.dxc5 Nc6
  • E24 Nimzo-Indian, Saemisch Variation
  • E25 Nimzo-Indian, Saemisch Variation, Keres Variation
  • E26 Nimzo-Indian, Saemisch Variation, 4.a3 Bxc3+ 5.bxc3 c5 6.e3
  • E27 Nimzo-Indian, Saemisch Variation, 5...0-0
  • E28 Nimzo-Indian, Saemisch Variation, 6.e3
  • E29 Nimzo-Indian, Saemisch Variation, Main line
  • E30 Nimzo-Indian, Leningrad Variation,
  • E31 Nimzo-Indian, Leningrad Variation, main line
  • E32 Nimzo-Indian, Classical Variation
  • E33 Nimzo-Indian, Classical Variation, 4...Nc6
  • E34 Nimzo-Indian, Classical, Noa Variation
  • E35 Nimzo-Indian, Classical, Noa Variation, 5.cxd5 exd5
  • E36 Nimzo-Indian, Classical, Noa Variation, 5.a3
  • E37 Nimzo-Indian, Classical, Noa Variation, Main line, 7.Qc2
  • E38 Nimzo-Indian, Classical, 4...c5
  • E39 Nimzo-Indian, Classical, Pirc Variation
  • E40 Nimzo-Indian, 4.e3
  • E41 Nimzo-Indian, 4.e3 c5
  • E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein)
  • E43 Nimzo-Indian, Fischer Variation
  • E44 Nimzo-Indian, Fischer Variation, 5.Ne2
  • E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation
  • E46 Nimzo-Indian, 4.e3 O-O
  • E47 Nimzo-Indian, 4.e3 O-O, 5.Bd3
  • E48 Nimzo-Indian, 4.e3 O-O, 5.Bd3 d5
  • E49 Nimzo-Indian, 4.e3, Botvinnik System
  • E50 Nimzo-Indian, 4.e3 O-O, 5.Nf3, without ...d5
  • E51 Nimzo-Indian, 4.e3 O-O, 5.Nf3 d5
  • E52 Nimzo-Indian, 4.e3, Main line with ...b6
  • E53 Nimzo-Indian, 4.e3, Main line with ...c5
  • E54 Nimzo-Indian, 4.e3, Gligoric System with 7...dxc4
  • E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation
  • E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6
  • E57 Nimzo-Indian, 4.e3, Main line with 8...dxc4 and 9...Bxc4 cxd4
  • E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3
  • E59 Nimzo-Indian, 4.e3, Main line

[edit] E60-E99

1. d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld) (E60-E99)

  • E60 King's Indian Defence
  • E61 King's Indian Defence, 3.Nc3
  • E62 King's Indian, Fianchetto Variation
  • E63 King's Indian, Fianchetto, Panno Variation
  • E64 King's Indian, Fianchetto, Yugoslav System
  • E65 King's Indian, Yugoslav, 7.O-O
  • E66 King's Indian, Fianchetto, Yugoslav Panno
  • E67 King's Indian, Fianchetto with ...Nd7
  • E68 King's Indian, Fianchetto, Classical Variation, 8.e4
  • E69 King's Indian, Fianchetto, Classical Main line
  • E70 King's Indian, 4.e4
  • E71 King's Indian, Makogonov System (5.h3)
  • E72 King's Indian with e4 & g3
  • E73 King's Indian, 5.Be2
  • E74 King's Indian, Averbakh, 6...c5
  • E75 King's Indian, Averbakh, Main line
  • E76 King's Indian Defence, Four Pawns Attack
  • E77 King's Indian, Four Pawns Attack, 6.Be2
  • E78 King's Indian, Four Pawns Attack, with Be2 and Nf3
  • E79 King's Indian, Four Pawns Attack, Main line
  • E80 King's Indian, Sämisch Variation
  • E81 King's Indian, Sämisch, 5...O-O
  • E82 King's Indian, Sämisch, double Fianchetto Variation
  • E83 King's Indian, Sämisch, 6...Nc6
  • E84 King's Indian, Sämisch, Panno Main line
  • E85 King's Indian, Sämisch, Orthodox Variation
  • E86 King's Indian, Sämisch, Orthodox, 7.Nge2 c6
  • E87 King's Indian, Sämisch, Orthodox, 7.d5
  • E88 King's Indian, Sämisch, Orthodox, 7.d5 c6
  • E89 King's Indian, Sämisch, Orthodox Main line
  • E90 King's Indian, 5.Nf3
  • E91 King's Indian, 6.Be2
  • E92 King's Indian, Classical Variation
  • E93 King's Indian, Petrosian System, Main line
  • E94 King's Indian, Orthodox Variation
  • E95 King's Indian, Orthodox, 7...Nbd7, 8.Re1
  • E96 King's Indian, Orthodox, 7...Nbd7, Main line
  • E97 King's Indian, Orthodox, Aronin-Taimanov Variation (Yugoslav Attack / Mar del Plata Variation)
  • E98 King's Indian, Orthodox, Aronin-Taimanov, 9.Ne1
  • E99 King's Indian, Orthodox, Aronin-Taimanov, Main

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