The 500 ECO Codes – Full Overview of the Classical Opening System


 

Closed Games and Semi-Closed Games

 

D00 Queen’s Pawn Game (including Blackmar–Diemer Gambit, Halosar Trap and others)
1. d4 d5

 


D01 Richter–Veresov Attack
1. d4 d5 2. Nc3 Nf6 3. Bg5

 


D02 Queen’s Pawn Game, 2.Nf3
1. d4 d5 2. Nf3

 


D03 Torre Attack, Tartakower Variation
1. d4 d5 2. Nf3 Nf6 3. Bg5

 


D04 Queen’s Pawn Game
1. d4 d5 2. Nf3 Nf6 3. e3

 


D05 Queen’s Pawn Game, Zukertort Variation (including Colle system)
1. d4 d5 2. Nf3 Nf6 3. e3 e6

 


D06 Queen’s Gambit (including the Baltic Defence, Marshall Defence and Symmetrical Defence)
1. d4 d5 2. c4

 


D07 Queens Gambit Declined; Chigorin Defence
1. d4 d5 2. c4 Nc6

 


D08 Queens Gambit Declined; Albin Countergambit and Lasker Trap
1. d4 d5 2. c4 e5

 


D09 Queens Gambit Declined; Albin Countergambit, 5.g3
1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3

 


D10 Queens Gambit Declined; Slav Defence
1. d4 d5 2. c4 c6

 


D11 Queens Gambit Declined; Slav Defence, 3.Nf3
1. d4 d5 2. c4 c6 3. Nf3

 


D12 Queens Gambit Declined; Slav Defence, 4.e3 Bf5
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5

 


D13 Queens Gambit Declined; Slav Defence, Exchange Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5

 


D14 Queens Gambit Declined; Slav Defence, Exchange Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5 cxd5 5. Nc3 Nc6 6. Bf4 Bf5

 


D15 Queens Gambit Declined; Slav, 4.Nc3
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3

 


D16 Queens Gambit Declined; Slav accepted, Alapin Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4

 


D17 Queens Gambit Declined; Slav Defence, Czech Defence
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5

 


D18 Queens Gambit Declined; Dutch Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3

 


D19 Queens Gambit Declined; Dutch Variation
1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bc4 Bb4 8. 0-0

 


D20 Queen’s Gambit Accepted
1. d4 d5 2. c4 dxc4

 


D21 Queen’s Gambit Accepted, 3.Nf3
1. d4 d5 2. c4 dxc4 3. Nf3

 


D22 Queen’s Gambit Accepted; Alekhine Defence
1. d4 d5 2. c4 dxc4 3. Nf3 a6

 


D23 Queen’s Gambit Accepted
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6

 


D24 Queen’s Gambit Accepted, 4.Nc3
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3

 


D25 Queen’s Gambit Accepted, 4.e3
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3

 


D26 Queen’s Gambit Accepted; Classical Variation
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6

 


D27 Queen’s Gambit Accepted; Classical Variation
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6

 


D28 Queen’s Gambit Accepted; Classical Variation 7.Qe2
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. 0-0 a6 7. Qe2

 


D29 Queen’s Gambit Accepted; Classical Variation 8…Bb7
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. Bb3 Bb7

 


D30 Queen’s Gambit Declined: Orthodox Defence
1. d4 d5 2. c4 e6

 


D31 Queens Gambit Declined, 3.Nc3
1. d4 d5 2. c4 e6 3. Nc3

 


D32 Queens Gambit Declined; Tarrasch Defence
1. d4 d5 2. c4 e6 3. Nc3 c5

 


D33 Queens Gambit Declined; Tarrasch, Schlechter–Rubinstein System
1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3

 


D34 Queens Gambit Declined; Tarrasch, 7…Be7
1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7

 


D35 Queens Gambit Declined; Exchange Variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6

 


D36 Queens Gambit Declined; Exchange, positional line, 6.Qc2
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. Qc2

 


D37 Queens Gambit Declined; 4.Nf3
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3

 


D38 Queens Gambit Declined; Ragozin Variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Bb4

 


D39 Queens Gambit Declined; Ragozin, Vienna Variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Bb4 5. Bg5 d5xc4

 


D40 Queens Gambit Declined; Semi-Tarrasch Defence
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5

 


D41 Queens Gambit Declined; Semi-Tarrasch, 5.cxd5
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5

 


D42 Queens Gambit Declined; Semi-Tarrasch, 7.Bd3
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3

 


D43 Queens Gambit Declined; Semi-Slav Defence
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6

 


D44 Queens Gambit Declined; Semi-Slav 5.Bg5 dxc4
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dxc4

 


D45 Queens Gambit Declined; Semi-Slav 5.e3
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3

 


D46 Queens Gambit Declined; Semi-Slav 6.Bd3
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3

 


D47 Queens Gambit Declined; Semi-Slav 7.Bc4
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4

 


D48 Queens Gambit Declined; Meran, 8…a6
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6

 


D49 Queens Gambit Declined; Meran, 11.Nxb5
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5

 


D50 Queens Gambit Declined; 4.Bg5
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5

 


D51 GD; 4.Bg5 Nbd7 (Cambridge Springs Defence and Elephant Trap)
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7

 


D52 Queens Gambit Declined
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3

 


D53 Queens Gambit Declined; 4.Bg5 Be7
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7

 


D54 Queens Gambit Declined; Anti-neo-Orthodox Variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Rc1

 


D55 Queens Gambit Declined; 6.Nf3
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3

 


D56 Queens Gambit Declined; Lasker Defence
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4

 


D57 Queens Gambit Declined; Lasker Defence, Main line
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. Bxe7 Qxe7 9. cxd5 Nxc3 10. bxc3

 


D58 Queens Gambit Declined; Tartakower (Tartakower–Makogonov–Bondarevsky) System
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 h6 7. Bh4 b6

 


D59 Queens Gambit Declined; Tartakower (Tartakower–Makogonov–Bondarevsky) System, 8.cxd5 Nxd5
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 h6 7. Bh4 b6 8. cxd5 Nxd5

 


D60 Queens Gambit Declined; Orthodox Defence
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7

 


D61 Queens Gambit Declined; Orthodox Defence, Rubinstein Variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Nbd7 7. Qc2

 


D62 Queens Gambit Declined; Orthodox Defence, 7.Qc2 c5, 8.cxd5 (Rubinstein)
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Qc2 c5 8. cxd5

 


D63 Queens Gambit Declined; Orthodox Defence, 7.Rc1
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Nbd7 7. Rc1

 


D64 Queens Gambit Declined; Orthodox Defence, Rubinstein Attack (with Rc1)
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Nbd7 7. Rc1 c6 8. Qc2

 


D65 Queens Gambit Declined; Orthodox Defence, Rubinstein Attack, Main line
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Nbd7 7. Rc1 c6 8. Qc2 a6 9.cxd5

 


D66 Queens Gambit Declined; Orthodox Defence, Bd3 line including Rubinstein Trap
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3

 


D67 Queens Gambit Declined; Orthodox Defence, Bd3 line, Capablanca freeing manoeuvre
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5

 


D68 Queens Gambit Declined; Orthodox Defence, Classical Variation
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5

 


D69 Queens Gambit Declined; Orthodox Defence, Classical, 13.dxe5
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. dxe5 Nxe5 14. Nxe5 Qxe5

 


D70 Neo-Grünfeld Defence
1. d4 Nf6 2. c4 g6 3. g3 d5

 


D71 Neo-Grünfeld, 5.cxd5
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. cxd5 Nxd5

 


D72 Neo-Grünfeld, 5.cxd5, Main line
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. cxd5 Nxd5 6. e4 Nb6 7. Ne2

 


D73 Neo-Grünfeld, 5.Nf3
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3

 


D74 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 0-0 6. cxd5 Nxd5 7. 0-0

 


D75 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0 c5, 8.Nc3
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 0-0 6. cxd5 Nxd5 7. 0-0 c5 8. Nc3

 


D76 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0 Nb6
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 0-0 6. cxd5 Nxd5 7. 0-0 Nb6

 


D77 Neo-Grünfeld, 6.0-0
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 O-O 6. O-O

 


D78 Neo-Grünfeld, 6.0-0 c6
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 0-0 6. 0-0 c6

 


D79 Neo-Grünfeld, 6.0-0, Main line
1. d4 Nf6 2. c4 g6 3. g3 d5 4. Bg2 Bg7 5. Nf3 0-0 6. 0-0 c6 7. cxd5 cxd5

 


D80 Grünfeld Defence
1. d4 Nf6 2. c4 g6 3. Nc3 d5

 


D81 Grünfeld; Russian Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Qb3

 


D82 Grünfeld 4.Bf4
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4

 


D83 Grünfeld Gambit
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 0-0

 


D84 Grünfeld Gambit accepted
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Rc1 c5 7. dxc5 Be6

 


D85 Grünfeld, Nadanian Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5

 


D86 Grünfeld, Exchange, Classical Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4

 


D87 Grünfeld, Exchange, Spassky Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O 8. Ne2 c5

 


D88 Grünfeld, Spassky Variation, Main line, 10…cxd4, 11.cxd4
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 c5 9. 0-0 Nc6 10. Be3 cxd4 11. cxd4

 


D89 Grünfeld, Spassky Variation, Main line, 13.Bd3
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 c5 9. 0-0 Nc6 10. Be3 cxd4 11. cxd4 Bg4 12. f3 Na5 13. Bd3

 


D90 Grünfeld, Three Knights Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3

 


D91 Grünfeld, Three Knights Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5

 


D92 Grünfeld, 5.Bf4
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4

 


D93 Grünfeld with 5.Bf4 0-0 6.e3
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 0-0 6. e3

 


D94 Grünfeld, 5.e3
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5.e3

 


D95 Grünfeld with 5.e3 0-0 6.Qb3
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 0-0 6. Qb3

 


D96 Grünfeld, Russian Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3

 


D97 Grünfeld, Russian Variation with 7.e4
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 0-0 7. e4

 


D98 Grünfeld, Russian, Smyslov Variation
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 0-0 7. e4 Bg4

 


D99 Grünfeld Defence, Smyslov, Main line
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 0-0 7. e4 Bg4 8. Be3 Nfd7 9. Qb3


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