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| Chess ECOs Found | Number Chess Games | Common ECO Name |
|---|
| D30 | 17542 | Queens Gambit Declined |
| D31 | 14245 | Queens Gambit Declined, 3.Nc3 |
| D32 | 3283 | Queens Gambit Declined, Tarrasch Defense |
| D33 | 323 | Queens Gambit Declined, Tarrasch, Schlechter-Rubinstein system |
| D34 | 1816 | Queens Gambit Declined, Tarrasch, 7...Be7 |
| D35 | 5912 | Queens Gambit Declined, Exchange Variation |
| D36 | 453 | Queens Gambit Declined, Exchange, positional line, 6.Qc2 |
| D37 | 3453 | Queens Gambit Declined, 4.Nf3 |
| D38 | 198 | Queens Gambit Declined, Ragozin variation |
| D39 | 116 | Queens Gambit Declined, Ragozin, Vienna variation |
| D40 | 161 | Queens Gambit Declined, Semi-Tarrasch defense |
| D41 | 365 | Queens Gambit Declined, Semi-Tarrasch, 5.cd |
| D42 | 53 | Queens Gambit Declined, Semi-Tarrasch, 7.Bd3 |
| D43 | 407 | Queens Gambit Declined, Semi-Slav Defense |
| D44 | 117 | Queens Gambit Declined, Semi-Slav 5.Bg5 dxc4 |
| D45 | 349 | Queens Gambit Declined, Semi-Slav 5.e3 |
| D46 | 93 | Queens Gambit Declined, Semi-Slav 6.Bd3 |
| D47 | 115 | Queens Gambit Declined, Semi-Slav 7.Bc4 |
| D48 | 44 | Queens Gambit Declined, Meran, 8...a6 |
| D49 | 30 | Queens Gambit Declined, Meran, 11.Nxb5 |
| D50 | 1457 | Queens Gambit Declined, 4.Bg5 |
| D51 | 3056 | Queens Gambit Declined, 4.Bg5 Nbd7 Cambridge Springs Defense |
| D52 | 898 | Queens Gambit Declined |
| D53 | 2415 | Queens Gambit Declined, 4.Bg5 Be7 |
| D54 | 2589 | Queens Gambit Declined, Anti-neo-Orthodox variation |
| D55 | 687 | Queens Gambit Declined, 6.Nf3 |
| D56 | 169 | Queens Gambit Declined, Lasker defense |
| D57 | 57 | Queens Gambit Declined, Lasker defense, Main line |
| D58 | 387 | Queens Gambit Declined, Tartakower Makagonov-Bondarevsky system |
| D59 | 232 | Queens Gambit Declined, Tartakower Makagonov-Bondarevsky system, 8.cd Nxd5 |
| D60 | 244 | Queens Gambit Declined, Orthodox defense |
| D61 | 185 | Queens Gambit Declined, Orthodox defense, Rubinstein variation |
| D62 | 25 | Queens Gambit Declined, Orthodox defense, 7.Qc2 c5, 8.cd Rubinstein |
| D63 | 150 | Queens Gambit Declined, Orthodox defense, 7.Rc1 |
| D64 | 76 | Queens Gambit Declined, Orthodox defense, Rubinstein attack with Rc1 |
| D65 | 2 | Queens Gambit Declined, Orthodox defense, Rubinstein attack, Main line |
| D66 | 80 | Queens Gambit Declined, Orthodox defense, Bd3 line |
| D67 | 47 | Queens Gambit Declined, Orthodox defense, Bd3 line, Capablanca freeing manoeuver |
| D68 | 86 | Queens Gambit Declined, Orthodox defense, Classical variation |
| D69 | 39 | Queens Gambit Declined, Orthodox defense, Classical, 13.dxe5 |