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ECO CODES
(Click on an opening description to see diagram)

D06 - D69

D06 Queen's Gambit
1. d2d4 d7d5 2. c2c4
D06 QGD: Grau (Sahovic) defence
1. d2d4 d7d5 2. c2c4 c8f5
D06 QGD: Marshall defence
1. d2d4 d7d5 2. c2c4 g8f6
D06 QGD: symmetrical (Austrian) defence
1. d2d4 d7d5 2. c2c4 c7c5
D07 QGD: Chigorin defence
1. d2d4 d7d5 2. c2c4 b8c6
D07 QGD: Chigorin defence, Janowski variation
1. d2d4 d7d5 2. c2c4 b8c6 3. b1c3 d5c4 4. g1f3
D08 QGD: Albin counter-gambit
1. d2d4 d7d5 2. c2c4 e7e5
D08 QGD: Albin counter-gambit, Lasker trap
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. e2e3 f8b4 5. c1d2 d4e3
D08 QGD: Albin counter-gambit
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. g1f3
D08 QGD: Albin counter-gambit, Alapin variation
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. g1f3 b8c6 5. b1d2
D08 QGD: Albin counter-gambit, Krenosz variation
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. g1f3 b8c6 5. b1d2 c8g4
6. h2h3 g4f3 7. d2f3 f8b4 8. c1d2 d8e7
D08 QGD: Albin counter-gambit, Janowski variation
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. g1f3 b8c6 5. b1d2 f7f6
D08 QGD: Albin counter-gambit, Balogh variation
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. g1f3 b8c6 5. b1d2 d8e7
D09 QGD: Albin counter-gambit, 5.g3
1. d2d4 d7d5 2. c2c4 e7e5 3. d4e5 d5d4 4. g1f3 b8c6 5. g2g3
D10 QGD Slav defence
1. d2d4 d7d5 2. c2c4 c7c6
D10 QGD Slav defence, Alekhine variation
1. d2d4 d7d5 2. c2c4 c7c6 3. b1c3 d5c4 4. e2e4
D10 QGD Slav: Winawer counter-gambit
1. d2d4 d7d5 2. c2c4 c7c6 3. b1c3 e7e5
D10 QGD Slav defence: exchange variation
1. d2d4 d7d5 2. c2c4 c7c6 3. c4d5
D11 QGD Slav: 3.Nf3
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3
D11 QGD Slav: Breyer variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1d2
D11 QGD Slav: 4.e3
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. e2e3
D12 QGD Slav: 4.e3 Bf5
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. e2e3 c8f5
D12 QGD Slav: Landau variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. e2e3 c8f5 5. c4d5 c6d5
6. d1b3 d8c8 7. c1d2 e7e6 8. b1a3
D12 QGD Slav: exchange variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. e2e3 c8f5 5. c4d5 c6d5
6. b1c3
D12 QGD Slav: Amsterdam variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. e2e3 c8f5 5. c4d5 c6d5
6. b1c3 e7e6 7. f3e5 f6d7
D13 QGD Slav: exchange variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. c4d5 c6d5
D14 QGD Slav: exchange variation, 6.Bf4 Bf5
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. c4d5 c6d5 5. b1c3 b8c6
6. c1f4 c8f5
D14 QGD Slav: exchange, Trifunovic variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. c4d5 c6d5 5. b1c3 b8c6
6. c1f4 c8f5 7. e2e3 e7e6 8. d1b3 f8b4
D15 QGD Slav: 4.Nc3
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3
D15 QGD Slav: Suechting variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d8b6
D15 QGD Slav: Schlechter variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 g7g6
D15 QGD Slav accepted
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4
D15 QGD Slav: 5.e3 (Alekhine variation)
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. e2e3
D15 QGD Slav: Slav gambit
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. e2e4
D15 QGD Slav: Tolush-Geller gambit
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. e2e4 b7b5
6. e4e5
D16 QGD Slav accepted: Alapin variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4
D16 QGD Slav: Smyslov variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 b8a6
6. e2e4 c8g4
D16 QGD Slav: Soultanbeieff variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 e7e6
D16 QGD Slav: Steiner variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8g4
D17 QGD Slav: Czech defence
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
D17 QGD Slav: Krause attack
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. f3e5
D17 QGD Slav: Carlsbad variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. f3e5 b8d7 7. e5c4 d8c7 8. g2g3 e7e5
D17 QGD Slav: Wiesbaden variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. f3e5 e7e6
D18 QGD Slav: Dutch variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. e2e3
D18 QGD Slav: Dutch, Lasker variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. e2e3 b8a6
D19 QGD Slav: Dutch variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. e2e3 e7e6 7. f1c4 f8b4 8. 0-0
D19 QGD Slav: Dutch variation, main line
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. e2e3 e7e6 7. f1c4 f8b4 8. 0-0 0-0 9. d1e2
D19 QGD Slav: Dutch, Saemisch variation
1. d2d4 d7d5 2. c2c4 c7c6 3. g1f3 g8f6 4. b1c3 d5c4 5. a2a4 c8f5
6. e2e3 e7e6 7. f1c4 f8b4 8. 0-0 0-0 9. d1e2 f6e4 10. g2g4
D20 Queen's gambit accepted
1. d2d4 d7d5 2. c2c4 d5c4
D20 QGA: 3.e4
1. d2d4 d7d5 2. c2c4 d5c4 3. e2e4
D20 QGA: Linares variation
1. d2d4 d7d5 2. c2c4 d5c4 3. e2e4 c7c5 4. d4d5 g8f6 5. b1c3 b7b5
D20 QGA: Schwartz defence
1. d2d4 d7d5 2. c2c4 d5c4 3. e2e4 f7f5
D21 QGA: 3.Nf3
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3
D21 QGA: Ericson variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 b7b5
D21 QGA: Alekhine defense, Borisenko-Furman variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 a7a6 4. e2e4
D22 QGA: Alekhine defence
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 a7a6
D22 QGA: Alekhine defence, Alatortsev variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 a7a6 4. e2e3 c8g4 5. f1c4 e7e6
6. d4d5
D22 QGA: Haberditz variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 a7a6 4. e2e3 b7b5
D23 Queen's gambit accepted
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6
D23 QGA: Mannheim variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. d1a4
D24 QGA, 4.Nc3
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. b1c3
D24 QGA, Bogolyubov variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. b1c3 a7a6 5. e2e4
D25 QGA, 4.e3
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3
D25 QGA, Smyslov variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 g7g6
D25 QGA, Janowsky-Larsen variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 c8g4
D25 QGA, Flohr variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 c8e6
D26 QGA: 4...e6
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6
D26 QGA: classical variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
D26 QGA: classical, Furman variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. d1e2 a7a6 7. d4c5 f8c5 8. 0-0 b8c6 9. e3e4 b7b5 10. e4e5
D26 QGA: classical variation, 6.O-O
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0
D26 QGA: classical, Steinitz variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 c5d4
D27 QGA: classical, 6...a6
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6
D27 QGA: classical, Rubinstein variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. a2a4
D27 QGA: classical, Geller variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. e3e4
D28 QGA: classical, 7.Qe2
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. d1e2
D28 QGA: classical, 7...b5
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. d1e2 b7b5
D28 QGA: classical, Flohr variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. d1e2 b7b5 8. c4b3 b8c6 9. f1d1 c5c4 10. b3c2 c6b4
11. b1c3 b4c2 12. e2c2 c8b7 13. d4d5 d8c7
D29 QGA: classical, 8...Bb7
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. d1e2 b7b5 8. c4b3 c8b7
D29 QGA: classical, Smyslov variation
1. d2d4 d7d5 2. c2c4 d5c4 3. g1f3 g8f6 4. e2e3 e7e6 5. f1c4 c7c5
6. 0-0 a7a6 7. d1e2 b7b5 8. c4b3 c8b7 9. f1d1 b8d7 10. b1c3 f8d6
D30 Queen's gambit declined
1. d2d4 d7d5 2. c2c4 e7e6
D30 QGD Slav
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. e2e3 c7c6 5. b1d2
D30 QGD: Stonewall variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. e2e3 c7c6 5. b1d2 f6e4
6. f1d3 f7f5
D30 QGD Slav
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. e2e3 c7c6 5. b1d2 b8d7
D30 QGD Slav: Semmering variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. e2e3 c7c6 5. b1d2 b8d7
6. f1d3 c6c5
D30 QGD: Spielmann variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. e2e3 c7c6 5. b1d2 g7g6
D30 QGD
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. c1g5
D30 QGD: Capablanca variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. b1d2
D30 QGD: Vienna variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. c1g5 f8b4
D30 QGD: Capablanca-Duras variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. c1g5 h7h6
D30 QGD: Hastings variation
1. d2d4 d7d5 2. c2c4 e7e6 3. g1f3 g8f6 4. c1g5 h7h6 5. g5f6 d8f6
6. b1c3 c7c6 7. d1b3
D31 QGD: 3.Nc3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3
D31 QGD: Janowski variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 a7a6
D31 QGD: Alapin variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 b7b6
D31 QGD: Charousek (Petrosian) variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 f8e7
D31 QGD: semi-Slav
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c6
D31 QGD: semi-Slav, Noteboom variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c6 4. g1f3 d5c4
D31 QGD: semi-Slav, Koomen variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c6 4. g1f3 d5c4 5. a2a4 f8b4
6. e2e3 b7b5 7. c1d2 d8e7
D31 QGD: semi-Slav, Junge variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c6 4. g1f3 d5c4 5. a2a4 f8b4
6. e2e3 b7b5 7. c1d2 d8b6
D31 QGD: semi-Slav, Abrahams variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c6 4. g1f3 d5c4 5. a2a4 f8b4
6. e2e3 b7b5 7. c1d2 a7a5
D31 QGD: semi-Slav, Marshall gambit
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c6 4. e2e4
D32 QGD: Tarrasch defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5
D32 QGD: Tarrasch, von Hennig-Schara gambit
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 c5d4
D32 QGD: Tarrasch defence, 4.cd ed
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5
D32 QGD: Tarrasch defence, Tarrasch gambit
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. d4c5 d5d4
6. c3a4 b7b5
D32 QGD: Tarrasch defence, Marshall gambit
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. e2e4
D32 QGD: Tarrasch defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3
D33 QGD: Tarrasch, Schlechter-Rubinstein system
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3
D33 QGD: Tarrasch, Folkestone (Swedish) variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 c5c4
D33 QGD: Tarrasch, Schlechter-Rubinstein system, Rey Ardid variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 c5c4 7. e2e4
D33 QGD: Tarrasch, Prague variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6
D33 QGD: Tarrasch, Wagner variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 c8g4
D34 QGD: Tarrasch, Prague variation, 7...Be7
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 f8e7
D34 QGD: Tarrasch, Prague variation, Normal position
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 f8e7 8. 0-0 0-0
D34 QGD: Tarrasch, Reti variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 f8e7 8. 0-0 0-0 9. d4c5 e7c5 10. c3a4
D34 QGD: Tarrasch, Prague variation, 9.Bg5
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 f8e7 8. 0-0 0-0 9. c1g5
D34 QGD: Tarrasch, Bogolyubov variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 f8e7 8. 0-0 0-0 9. c1g5 c8e6 10. a1c1 c5c4
D34 QGD: Tarrasch, Stoltz variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 c7c5 4. c4d5 e6d5 5. g1f3 b8c6
6. g2g3 g8f6 7. f1g2 f8e7 8. 0-0 0-0 9. c1g5 c8e6 10. a1c1 b7b6
D35 QGD: 3...Nf6
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6
D35 QGD: Harrwitz attack
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1f4
D35 QGD: exchange variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c4d5
D35 QGD: exchange, Saemisch variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c4d5 e6d5 5. g1f3 b8d7
6. c1f4
D35 QGD: exchange, positional line
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c4d5 e6d5 5. c1g5
D35 QGD: exchange, chameleon variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c4d5 e6d5 5. c1g5 f8e7
6. e2e3 0-0 7. f1d3 b8d7 8. d1c2 f8e8 9. g1e2 d7f8 10. 0-0-0
D35 QGD: exchange, positional line, 5...c6
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c4d5 e6d5 5. c1g5 c7c6
D36 QGD: exchange, positional line, 6.Qc2
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c4d5 e6d5 5. c1g5 c7c6
6. d1c2
D37 QGD: 4.Nf3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3
D37 QGD: classical variation (5.Bf4)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 f8e7 5. c1f4
D38 QGD: Ragozin variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 f8b4
D39 QGD: Ragozin, Vienna variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 f8b4 5. c1g5 d5c4
D40 QGD: Semi-Tarrasch defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5
D40 QGD: Semi-Tarrasch, symmetrical variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. e2e3 b8c6
6. f1d3 f8d6 7. 0-0 0-0
D40 QGD: Semi-Tarrasch, Levenfish variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. e2e3 b8c6
6. f1d3 f8d6 7. 0-0 0-0 8. d1e2 d8e7 9. d4c5 d6c5 10. e3e4
D40 QGD: Semi-Tarrasch defence, Pillsbury variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. c1g5
D41 QGD: Semi-Tarrasch, 5.cd
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. c4d5
D41 QGD: Semi-Tarrasch, Kmoch variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. c4d5 f6d5
6. e2e4 d5c3 7. b2c3 c5d4 8. c3d4 f8b4 9. c1d2 b4d2 10. d1d2 0-0
11. f1b5
D41 QGD: Semi-Tarrasch, San Sebastian variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. c4d5 f6d5
6. e2e4 d5c3 7. b2c3 c5d4 8. c3d4 f8b4 9. c1d2 d8a5
D41 QGD: Semi-Tarrasch with e3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. c4d5 f6d5
6. e2e3
D42 QGD: Semi-Tarrasch, 7.Bd3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c5 5. c4d5 f6d5
6. e2e3 b8c6 7. f1d3
D43 QGD semi-Slav
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6
D43 QGD semi-Slav: Hastings variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 h7h6
6. g5f6 d8f6 7. d1b3
D44 QGD semi-Slav: 5.Bg5 dc
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
D44 QGD semi-Slav: Botvinnik system (anti-Meran)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
6. e2e4
D44 QGD semi-Slav: Ekstrom variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
6. e2e4 b7b5 7. e4e5 h7h6 8. g5h4 g7g5 9. e5f6 g5h4 10. f3e5
D44 QGD semi-Slav: anti-Meran gambit
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
6. e2e4 b7b5 7. e4e5 h7h6 8. g5h4 g7g5 9. f3g5
D44 QGD semi-Slav: anti-Meran, Lilienthal variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
6. e2e4 b7b5 7. e4e5 h7h6 8. g5h4 g7g5 9. f3g5 h6g5 10. h4g5 b8d7
11. g2g3
D44 QGD semi-Slav: anti-Meran, Szabo variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
6. e2e4 b7b5 7. e4e5 h7h6 8. g5h4 g7g5 9. f3g5 h6g5 10. h4g5 b8d7
11. d1f3
D44 QGD semi-Slav: anti-Meran, Alatortsev system
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. c1g5 d5c4
6. e2e4 b7b5 7. e4e5 h7h6 8. g5h4 g7g5 9. f3g5 f6d5
D45 QGD semi-Slav: 5.e3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3
D45 QGD semi-Slav: stonewall defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 f6e4
6. f1d3 f7f5
D45 QGD semi-Slav: accelerated Meran (Alekhine variation)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 a7a6
D45 QGD semi-Slav: 5...Nd7
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
D45 QGD semi-Slav: Stoltz variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. d1c2
D45 QGD semi-Slav: Rubinstein (anti-Meran) system
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f3e5
D46 QGD semi-Slav: 6.Bd3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3
D46 QGD semi-Slav: Bogolyubov variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 f8e7
D46 QGD semi-Slav: Romih variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 f8b4
D46 QGD semi-Slav: Chigorin defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 f8d6
D47 QGD semi-Slav: 7.Bc4
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4
D47 QGD semi-Slav: Meran variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5
D47 QGD semi-Slav: neo-Meran (Lundin variation)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 b5b4
D47 QGD semi-Slav: Meran, Wade variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 c8b7
D48 QGD semi-Slav: Meran, 8...a6
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6
D48 QGD semi-Slav: Meran, Pirc variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 b5b4
D48 QGD semi-Slav: Meran
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5
D48 QGD semi-Slav: Meran, Reynolds' variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. d4d5
D48 QGD semi-Slav: Meran, old main line
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5
D49 QGD semi-Slav: Meran, Blumenfeld variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5 c5d4
11. c3b5
D49 QGD semi-Slav: Meran, Rabinovich variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5 c5d4
11. c3b5 f6g4
D49 QGD semi-Slav: Meran, Sozin variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5 c5d4
11. c3b5 d7e5
D49 QGD semi-Slav: Meran, Stahlberg variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5 c5d4
11. c3b5 d7e5 12. f3e5 a6b5 13. d1f3
D49 QGD semi-Slav: Meran, Sozin variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5 c5d4
11. c3b5 d7e5 12. f3e5 a6b5 13. 0-0
D49 QGD semi-Slav: Meran, Rellstab attack
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. g1f3 c7c6 5. e2e3 b8d7
6. f1d3 d5c4 7. d3c4 b7b5 8. c4d3 a7a6 9. e3e4 c6c5 10. e4e5 c5d4
11. c3b5 d7e5 12. f3e5 a6b5 13. 0-0 d8d5 14. d1e2 c8a6 15. c1g5
D50 QGD: 4.Bg5
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5
D50 QGD: Been-Koomen variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 c7c5
D50 QGD: Semi-Tarrasch, Krause variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 c7c5 5. g1f3 c5d4
6. f3d4 e6e5 7. d4b5 a7a6 8. d1a4
D50 QGD: Semi-Tarrasch, Primitive Pillsbury variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 c7c5 5. g1f3 c5d4
6. d1d4
D50 QGD: Semi-Tarrasch
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 c7c5 5. c4d5
D50 QGD: Canal (Venice) variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 c7c5 5. c4d5 d8b6
D51 QGD: 4.Bg5 Nbd7
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7
D51 QGD: Rochlin variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. g1f3 c7c6
6. a1c1 d8a5 7. g5d2
D51 QGD: Alekhine variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. g1f3 c7c6
6. e2e4
D51 QGD
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3
D51 QGD: Manhattan variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 f8b4
D51 QGD: 5...c6
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
D51 QGD: Capablanca anti-Cambridge Springs variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. a2a3
D52 QGD
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3
D52 QGD: Cambridge Springs defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5
D52 QGD: Cambridge Springs defence, Bogoljubow variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5 7. f3d2 f8b4 8. d1c2
D52 QGD: Cambridge Springs defence, Argentine variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5 7. f3d2 f8b4 8. d1c2 0-0 9. g5h4
D52 QGD: Cambridge Springs defence, Rubinstein variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5 7. f3d2 d5c4
D52 QGD: Cambridge Springs defence, Capablanca variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5 7. g5f6
D52 QGD: Cambridge Springs defence, 7.cd
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5 7. c4d5
D52 QGD: Cambridge Springs defence, Yugoslav variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 b8d7 5. e2e3 c7c6
6. g1f3 d8a5 7. c4d5 f6d5
D53 QGD: 4.Bg5 Be7
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7
D53 QGD: Lasker variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 f6e4
D53 QGD: 4.Bg5 Be7, 5.e3 O-O
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
D54 QGD: Anti-neo-orthodox variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. a1c1
D55 QGD: 6.Nf3
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3
D55 QGD: Pillsbury attack
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b7b6 7. f1d3 c8b7 8. c4d5 e6d5 9. f3e5
D55 QGD: Neo-orthodox variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6
D55 QGD: Neo-orthodox variation, 7.Bxf6
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5f6
D55 QGD: Petrosian variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5f6 e7f6 8. a1c1 c7c6 9. f1d3 b8d7 10. 0-0 d5c4
11. d3c4
D55 QGD: Neo-orthodox variation, 7.Bh4
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4
D56 QGD: Lasker defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 f6e4
D56 QGD: Lasker defence, Teichmann variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 f6e4 8. h4e7 d8e7 9. d1c2
D56 QGD: Lasker defence, Russian variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 f6e4 8. h4e7 d8e7 9. d1c2 e4f6 10. f1d3 d5c4
11. d3c4 c7c5 12. 0-0 b8c6 13. f1d1 c8d7
D57 QGD: Lasker defence, main line
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 f6e4 8. h4e7 d8e7 9. c4d5 e4c3 10. b2c3
D57 QGD: Lasker defence, Bernstein variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 f6e4 8. h4e7 d8e7 9. c4d5 e4c3 10. b2c3 e6d5
11. d1b3 e7d6
D58 QGD: Tartakower (Makagonov-Bondarevsky) system
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 b7b6
D59 QGD: Tartakower (Makagonov-Bondarevsky) system, 8.cd Nxd5
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 b7b6 8. c4d5 f6d5
D59 QGD: Tartakower variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 h7h6 7. g5h4 b7b6 8. c4d5 f6d5 9. h4e7 d8e7 10. c3d5 e6d5
11. a1c1 c8e6
D60 QGD: Orthodox defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7
D60 QGD: Orthodox defence, Botvinnik variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. f1d3
D60 QGD: Orthodox defence, Rauzer variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. d1b3
D61 QGD: Orthodox defence, Rubinstein variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. d1c2
D62 QGD: Orthodox defence, 7.Qc2 c5, 8.cd (Rubinstein)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. d1c2 c7c5 8. c4d5
D63 QGD: Orthodox defence, 7.Rc1
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1
D63 QGD: Orthodox defence, Pillsbury attack
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 b7b6 8. c4d5 e6d5 9. f1d3
D63 QGD: Orthodox defence, Capablanca variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 b7b6 8. c4d5 e6d5 9. f1b5
D63 QGD: Orthodox defence, Swiss (Henneberger) variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 a7a6
D63 QGD: Orthodox defence, Swiss, Karlsbad variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 a7a6 8. c4d5
D63 QGD: Orthodox defence
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6
D64 QGD: Orthodox defence, Rubinstein attack (with Rc1)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. d1c2
D64 QGD: Orthodox defence, Rubinstein attack, Wolf variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. d1c2 f6e4
D64 QGD: Orthodox defence, Rubinstein attack, Karlsbad variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. d1c2 a7a6
D64 QGD: Orthodox defence, Rubinstein attack, Gruenfeld variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. d1c2 a7a6 9. a2a3
D65 QGD: Orthodox defence, Rubinstein attack, main line
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. d1c2 a7a6 9. c4d5
D66 QGD: Orthodox defence, Bd3 line
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3
D66 QGD: Orthodox defence, Bd3 line, fianchetto variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 b7b5
D67 QGD: Orthodox defence, Bd3 line, Capablanca freeing manoevre
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5
D67 QGD: Orthodox defence, Bd3 line, Janowski variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. h2h4
D67 QGD: Orthodox defence, Bd3 line
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
D67 QGD: Orthodox defence, Bd3 line, Alekhine variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
11. c3e4
D67 QGD: Orthodox defence, Bd3 line, 11.O-O
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
11. 0-0
D68 QGD: Orthodox defence, classical variation
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
11. 0-0 d5c3 12. c1c3 e6e5
D68 QGD: Orthodox defence, classical, 13.d1b1 (Maroczy)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
11. 0-0 d5c3 12. c1c3 e6e5 13. d1b1
D68 QGD: Orthodox defence, classical, 13.d1c2 (Vidmar)
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
11. 0-0 d5c3 12. c1c3 e6e5 13. d1c2
D69 QGD: Orthodox defence, classical, 13.de
1. d2d4 d7d5 2. c2c4 e7e6 3. b1c3 g8f6 4. c1g5 f8e7 5. e2e3 0-0
6. g1f3 b8d7 7. a1c1 c7c6 8. f1d3 d5c4 9. d3c4 f6d5 10. g5e7 d8e7
11. 0-0 d5c3 12. c1c3 e6e5 13. d4e5 d7e5 14. f3e5 e7e5




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