[ECO "E00"]
[Opening "Queen's pawn game"]

1. d4 Nf6 2. c4 e6

[ECO "E00"]
[Opening "Neo-Indian (Seirawan) attack"]

1. d4 Nf6 2. c4 e6 3. Bg5

[ECO "E00"]
[Opening "Catalan Opening"]

1. d4 Nf6 2. c4 e6 3. g3

[ECO "E01"]
[Opening "Catalan"]
[Variation "Closed"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2

[ECO "E02"]
[Opening "Catalan"]
[Variation "Open, 5.Qa4"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+

[ECO "E03"]
[Opening "Catalan"]
[Variation "Open, Alekhine variation"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. Qc2

[ECO "E03"]
[Opening "Catalan"]
[Variation "Open, 5.Qa4 Nbd7, 6.Qxc4"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4

[ECO "E04"]
[Opening "Catalan"]
[Variation "Open, 5.Nf3"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3

[ECO "E05"]
[Opening "Catalan"]
[Variation "Open, Classical line"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7

[ECO "E06"]
[Opening "Catalan"]
[Variation "Closed, 5.Nf3"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3

[ECO "E07"]
[Opening "Catalan"]
[Variation "Closed, 6...Nbd7"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7

[ECO "E07"]
[Opening "Catalan"]
[Variation "Closed, Botvinnik variation"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 c6 8.
Qd3

[ECO "E08"]
[Opening "Catalan"]
[Variation "Closed, 7.Qc2"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2

[ECO "E08"]
[Opening "Catalan"]
[Variation "Closed, Zagoryansky variation"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8.
Rd1 b6 9. a4

[ECO "E08"]
[Opening "Catalan"]
[Variation "Closed, Qc2 & b3"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8.
b3

[ECO "E08"]
[Opening "Catalan"]
[Variation "Closed, Spassky gambit"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8.
b3 b6 9. Rd1 Bb7 10. Nc3 b5

[ECO "E09"]
[Opening "Catalan"]
[Variation "Closed, Main line"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8.
Nbd2

[ECO "E09"]
[Opening "Catalan"]
[Variation "Closed, Sokolsky variation"]

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8.
Nbd2 b6 9. b3 a5 10. Bb2 Ba6

[ECO "E10"]
[Opening "Queen's pawn game"]

1. d4 Nf6 2. c4 e6 3. Nf3

[ECO "E10"]
[Opening "Blumenfeld counter-gambit"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5

[ECO "E10"]
[Opening "Blumenfeld counter-gambit accepted"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. dxe6 fxe6 6. cxb5 d5

[ECO "E10"]
[Opening "Blumenfeld counter-gambit, Dus-Chotimursky variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5

[ECO "E10"]
[Opening "Blumenfeld counter-gambit, Spielmann variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5 exd5 6. cxd5 h6

[ECO "E10"]
[Opening "Dzindzikhashvili defence"]

1. d4 Nf6 2. c4 e6 3. Nf3 a6

[ECO "E10"]
[Opening "Doery defence"]

1. d4 Nf6 2. c4 e6 3. Nf3 Ne4

[ECO "E11"]
[Opening "Bogo-Indian defence"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+

[ECO "E11"]
[Opening "Bogo-Indian defence, Gruenfeld variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2

[ECO "E11"]
[Opening "Bogo-Indian defence, Nimzovich variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7

[ECO "E11"]
[Opening "Bogo-Indian defence, Monticelli trap"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Bb7 7. Bg2 O-O
8. Nc3 Ne4 9. Qc2 Nxc3 10. Ng5

[ECO "E12"]
[Opening "Queen's Indian defence"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6

[ECO "E12"]
[Opening "Queen's Indian"]
[Variation "Miles variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Bf4

[ECO "E12"]
[Opening "Queen's Indian"]
[Variation "Petrosian system"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3

[ECO "E12"]
[Opening "Queen's Indian"]
[Variation "4.Nc3"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3

[ECO "E12"]
[Opening "Queen's Indian"]
[Variation "4.Nc3, Botvinnik variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 g5 7. Bg3 Nh5

[ECO "E13"]
[Opening "Queen's Indian"]
[Variation "4.Nc3, Main line"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 Bb4

[ECO "E14"]
[Opening "Queen's Indian"]
[Variation "4.e3"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3

[ECO "E14"]
[Opening "Queen's Indian"]
[Variation "Averbakh variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 Bb7 5. Bd3 c5 6. O-O Be7 7. b3 O-O 8.
Bb2 cxd4 9. Nxd4

[ECO "E15"]
[Opening "Queen's Indian"]
[Variation "4.g3"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3

[ECO "E15"]
[Opening "Queen's Indian"]
[Variation "Nimzovich variation (exaggerated Fianchetto)"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6

[ECO "E15"]
[Opening "Queen's Indian"]
[Variation "4.g3 Bb7"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7

[ECO "E15"]
[Opening "Queen's Indian"]
[Variation "Rubinstein variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. d5 exd5 7. Nh4

[ECO "E15"]
[Opening "Queen's Indian"]
[Variation "Buerger variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. d5 exd5 7. Ng5

[ECO "E16"]
[Opening "Queen's Indian"]
[Variation "Capablanca variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+

[ECO "E16"]
[Opening "Queen's Indian"]
[Variation "Yates variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 a5

[ECO "E16"]
[Opening "Queen's Indian"]
[Variation "Riumin variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Be7

[ECO "E17"]
[Opening "Queen's Indian"]
[Variation "5.Bg2 Be7"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7

[ECO "E17"]
[Opening "Queen's Indian"]
[Variation "Anti-Queen's Indian system"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3

[ECO "E17"]
[Opening "Queen's Indian"]
[Variation "Opovcensky variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. Bd2

[ECO "E17"]
[Opening "Queen's Indian"]
[Variation "Old Main line, 6.O-O"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O

[ECO "E17"]
[Opening "Queen's Indian"]
[Variation "Euwe variation"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. b3

[ECO "E18"]
[Opening "Queen's Indian"]
[Variation "Old Main line, 7.Nc3"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3

[ECO "E19"]
[Opening "Queen's Indian"]
[Variation "Old Main line, 9.Qxc3"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8.
Qc2 Nxc3 9. Qxc3

[ECO "E20"]
[Opening "Nimzo-Indian defence"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4

[ECO "E20"]
[Opening "Nimzo-Indian"]
[Variation "Kmoch variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3

[ECO "E20"]
[Opening "Nimzo-Indian"]
[Variation "Mikenas attack"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qd3

[ECO "E20"]
[Opening "Nimzo-Indian"]
[Variation "Romanishin-Kasparov (Steiner) system"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3

[ECO "E21"]
[Opening "Nimzo-Indian"]
[Variation "Three knights variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3

[ECO "E21"]
[Opening "Nimzo-Indian"]
[Variation "Three knights, Korchnoi variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5

[ECO "E21"]
[Opening "Nimzo-Indian"]
[Variation "Three knights, Euwe variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 Ne4

[ECO "E22"]
[Opening "Nimzo-Indian"]
[Variation "Spielmann variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3

[ECO "E23"]
[Opening "Nimzo-Indian"]
[Variation "Spielmann, 4...c5, 5.dc Nc6"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6

[ECO "E23"]
[Opening "Nimzo-Indian"]
[Variation "Spielmann, Karlsbad variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxd2


[ECO "E23"]
[Opening "Nimzo-Indian"]
[Variation "Spielmann, San Remo variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxc5


[ECO "E23"]
[Opening "Nimzo-Indian"]
[Variation "Spielmann, Staahlberg variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxc5
8. Qc2 f5 9. g3

[ECO "E24"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3

[ECO "E24"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch, Botvinnik variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. e3 O-O 8.
cxd5 Nxd5

[ECO "E25"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5

[ECO "E25"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch, Keres variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5 Nxd5
8. dxc5

[ECO "E25"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch, Romanovsky variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5 Nxd5
8. dxc5 f5

[ECO "E26"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3

[ECO "E26"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch, O'Kelly variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 b6

[ECO "E27"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O

[ECO "E28"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. e3

[ECO "E29"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch, Main line"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. e3 c5 7. Bd3 Nc6

[ECO "E29"]
[Opening "Nimzo-Indian"]
[Variation "Saemisch, Capablanca variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. e3 c5 7. Bd3 Nc6
8. Ne2 b6 9. e4 Ne8

[ECO "E30"]
[Opening "Nimzo-Indian"]
[Variation "Leningrad variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5

[ECO "E30"]
[Opening "Nimzo-Indian"]
[Variation "Leningrad, ...b5 gambit"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 b5

[ECO "E31"]
[Opening "Nimzo-Indian"]
[Variation "Leningrad, Main line"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 d6

[ECO "E32"]
[Opening "Nimzo-Indian"]
[Variation "Classical variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2

[ECO "E32"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Adorjan gambit"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b5

[ECO "E33"]
[Opening "Nimzo-Indian"]
[Variation "Classical, 4...Nc6"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6

[ECO "E33"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Milner-Barry (Zurich) variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6 5. Nf3 d6

[ECO "E34"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Noa variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5

[ECO "E35"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Noa variation, 5.cd ed"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 exd5

[ECO "E36"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Noa variation, 5.a3"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3

[ECO "E36"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Botvinnik variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Nc6

[ECO "E36"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Noa variation, Main line"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4

[ECO "E37"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Noa variation, Main line, 7.Qc2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2

[ECO "E37"]
[Opening "Nimzo-Indian"]
[Variation "Classical, San Remo variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 Nc6
8. e3 e5

[ECO "E38"]
[Opening "Nimzo-Indian"]
[Variation "Classical, 4...c5"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5

[ECO "E39"]
[Opening "Nimzo-Indian"]
[Variation "Classical, Pirc variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O

[ECO "E40"]
[Opening "Nimzo-Indian"]
[Variation "4.e3"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3

[ECO "E40"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Taimanov variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 Nc6

[ECO "E41"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 c5"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5

[ECO "E41"]
[Opening "Nimzo-Indian"]
[Variation "e3, Huebner variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3 d6

[ECO "E42"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 c5, 5.Ne2 (Rubinstein)"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2

[ECO "E43"]
[Opening "Nimzo-Indian"]
[Variation "Fischer variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6

[ECO "E44"]
[Opening "Nimzo-Indian"]
[Variation "Fischer variation, 5.Ne2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2

[ECO "E45"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Bronstein (Byrne) variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6

[ECO "E46"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 O-O"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O

[ECO "E46"]
[Opening "Nimzo-Indian"]
[Variation "Reshevsky variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2

[ECO "E46"]
[Opening "Nimzo-Indian"]
[Variation "Simagin variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2 d5 6. a3 Bd6

[ECO "E47"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 O-O, 5.Bd3"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3

[ECO "E48"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 O-O, 5.Bd3 d5"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5

[ECO "E49"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Botvinnik system"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. a3 Bxc3+ 7. bxc3

[ECO "E50"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 e8g8, 5.Nf3, without ...d5"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3

[ECO "E51"]
[Opening "Nimzo-Indian"]
[Variation "4.e3 e8g8, 5.Nf3 d7d5"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5

[ECO "E51"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Ragozin variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 Nc6 7. O-O dxc4

[ECO "E52"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Main line with ...b6"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 b6

[ECO "E53"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Main line with ...c5"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5

[ECO "E53"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Keres variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O b6

[ECO "E53"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Gligoric system with 7...Nbd7"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nbd7

[ECO "E54"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Gligoric system with 7...dc"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O dxc4 8.
Bxc4

[ECO "E54"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Gligoric system, Smyslov variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O dxc4 8.
Bxc4 Qe7

[ECO "E55"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Gligoric system, Bronstein variation"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O dxc4 8.
Bxc4 Nbd7

[ECO "E56"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Main line with 7...Nc6"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6

[ECO "E57"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Main line with 8...dc and 9...cd"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8.
a3 dxc4 9. Bxc4 cxd4

[ECO "E58"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Main line with 8...Bxc3"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8.
a3 Bxc3 9. bxc3

[ECO "E59"]
[Opening "Nimzo-Indian"]
[Variation "4.e3, Main line"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8.
a3 Bxc3 9. bxc3 dxc4 10. Bxc4

[ECO "E60"]
[Opening "King's Indian defence"]

1. d4 Nf6 2. c4 g6

[ECO "E60"]
[Opening "King's Indian, 3.Nf3"]

1. d4 Nf6 2. c4 g6 3. Nf3

[ECO "E60"]
[Opening "Queen's pawn"]
[Variation "Mengarini attack"]

1. d4 Nf6 2. c4 g6 3. Qc2

[ECO "E60"]
[Opening "King's Indian"]
[Variation "Anti-Gruenfeld"]

1. d4 Nf6 2. c4 g6 3. d5

[ECO "E60"]
[Opening "King's Indian"]
[Variation "Danube gambit"]

1. d4 Nf6 2. c4 g6 3. d5 b5

[ECO "E60"]
[Opening "King's Indian"]
[Variation "3.g3"]

1. d4 Nf6 2. c4 g6 3. g3

[ECO "E60"]
[Opening "King's Indian"]
[Variation "3.g3, counterthrust variation"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5

[ECO "E61"]
[Opening "King's Indian defence, 3.Nc3"]

1. d4 Nf6 2. c4 g6 3. Nc3

[ECO "E61"]
[Opening "King's Indian"]
[Variation "Smyslov system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. Bg5

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto, Larsen system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c6 7. O-O Bf5

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto, Kavalek (Bronstein) variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c6 7. O-O Qa5

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto with ...Nc6"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto, Uhlmann (Szabo) variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O e5

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto, lesser Simagin (Spassky) variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O Bf5

[ECO "E62"]
[Opening "King's Indian"]
[Variation "Fianchetto, Simagin variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O Bg4

[ECO "E63"]
[Opening "King's Indian"]
[Variation "Fianchetto, Panno variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O a6

[ECO "E64"]
[Opening "King's Indian"]
[Variation "Fianchetto, Yugoslav system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c5

[ECO "E65"]
[Opening "King's Indian"]
[Variation "Fianchetto, Yugoslav, 7.O-O"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c5 7. O-O

[ECO "E66"]
[Opening "King's Indian"]
[Variation "Fianchetto, Yugoslav Panno"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c5 7. O-O Nc6 8.
d5

[ECO "E67"]
[Opening "King's Indian"]
[Variation "Fianchetto with ...Nd7"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7

[ECO "E67"]
[Opening "King's Indian"]
[Variation "Fianchetto, Classical variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5

[ECO "E68"]
[Opening "King's Indian"]
[Variation "Fianchetto, Classical variation, 8.e4"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 8.
e4

[ECO "E69"]
[Opening "King's Indian"]
[Variation "Fianchetto, Classical Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 8.
e4 c6 9. h3

[ECO "E70"]
[Opening "King's Indian"]
[Variation "4.e4"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4

[ECO "E70"]
[Opening "King's Indian"]
[Variation "Kramer system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nge2

[ECO "E70"]
[Opening "King's Indian"]
[Variation "Accelerated Averbakh system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Bg5

[ECO "E71"]
[Opening "King's Indian"]
[Variation "Makagonov system (5.h3)"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3

[ECO "E72"]
[Opening "King's Indian with e4 & g3"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. g3

[ECO "E72"]
[Opening "King's Indian"]
[Variation "Pomar system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. g3 O-O 6. Bg2 e5 7. Nge2

[ECO "E73"]
[Opening "King's Indian"]
[Variation "5.Be2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2

[ECO "E73"]
[Opening "King's Indian"]
[Variation "Semi-Averbakh system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Be3

[ECO "E73"]
[Opening "King's Indian"]
[Variation "Averbakh system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5

[ECO "E74"]
[Opening "King's Indian"]
[Variation "Averbakh, 6...c5"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5

[ECO "E75"]
[Opening "King's Indian"]
[Variation "Averbakh, Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 e6

[ECO "E76"]
[Opening "King's Indian"]
[Variation "Four pawns attack"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4

[ECO "E76"]
[Opening "King's Indian"]
[Variation "Four pawns attack, dynamic line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. d5

[ECO "E77"]
[Opening "King's Indian"]
[Variation "Four pawns attack, 6.Be2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2

[ECO "E77"]
[Opening "King's Indian"]
[Variation "Six pawns attack"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. dxe6
fxe6 9. g4 Nc6 10. h4

[ECO "E77"]
[Opening "King's Indian"]
[Variation "Four pawns attack"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. Nf3


[ECO "E77"]
[Opening "King's Indian"]
[Variation "Four pawns attack, Florentine gambit"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. Nf3
exd5 9. e5

[ECO "E78"]
[Opening "King's Indian"]
[Variation "Four pawns attack, with Be2 and Nf3"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. Nf3

[ECO "E79"]
[Opening "King's Indian"]
[Variation "Four pawns attack, Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. Nf3 cxd4 8.
Nxd4 Nc6 9. Be3

[ECO "E80"]
[Opening "King's Indian"]
[Variation "Saemisch variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3

[ECO "E81"]
[Opening "King's Indian"]
[Variation "Saemisch, 5...O-O"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O

[ECO "E81"]
[Opening "King's Indian"]
[Variation "Saemisch, Byrne variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 c6 7. Bd3 a6

[ECO "E82"]
[Opening "King's Indian"]
[Variation "Saemisch, double Fianchetto variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 b6

[ECO "E83"]
[Opening "King's Indian"]
[Variation "Saemisch, 6...Nc6"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6

[ECO "E83"]
[Opening "King's Indian"]
[Variation "Saemisch, Ruban variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 Rb8

[ECO "E83"]
[Opening "King's Indian"]
[Variation "Saemisch, Panno formation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6

[ECO "E84"]
[Opening "King's Indian"]
[Variation "Saemisch, Panno Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6 8.
Qd2 Rb8

[ECO "E85"]
[Opening "King's Indian"]
[Variation "Saemisch, Orthodox variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5

[ECO "E86"]
[Opening "King's Indian"]
[Variation "Saemisch, Orthodox, 7.Nge2 c6"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. Nge2 c6

[ECO "E87"]
[Opening "King's Indian"]
[Variation "Saemisch, Orthodox, 7.d5"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5

[ECO "E87"]
[Opening "King's Indian"]
[Variation "Saemisch, Orthodox, Bronstein variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 Nh5 8. Qd2
Qh4+ 9. g3 Nxg3 10. Qf2 Nxf1 11. Qxh4 Nxe3 12. Ke2 Nxc4

[ECO "E88"]
[Opening "King's Indian"]
[Variation "Saemisch, Orthodox, 7.d5 c6"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 c6

[ECO "E89"]
[Opening "King's Indian"]
[Variation "Saemisch, Orthodox Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 c6 8. Nge2
cxd5

[ECO "E90"]
[Opening "King's Indian"]
[Variation "5.Nf3"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3

[ECO "E90"]
[Opening "King's Indian"]
[Variation "Larsen variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be3

[ECO "E90"]
[Opening "King's Indian"]
[Variation "Zinnowitz variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Bg5

[ECO "E91"]
[Opening "King's Indian"]
[Variation "6.Be2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2

[ECO "E91"]
[Opening "King's Indian"]
[Variation "Kazakh variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Na6

[ECO "E92"]
[Opening "King's Indian"]
[Variation "Classical variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5

[ECO "E92"]
[Opening "King's Indian"]
[Variation "Andersson variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. dxe5

[ECO "E92"]
[Opening "King's Indian"]
[Variation "Gligoric-Taimanov system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. Be3

[ECO "E92"]
[Opening "King's Indian"]
[Variation "Petrosian system"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5

[ECO "E92"]
[Opening "King's Indian"]
[Variation "Petrosian system, Stein variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 a5

[ECO "E93"]
[Opening "King's Indian"]
[Variation "Petrosian system, Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7

[ECO "E93"]
[Opening "King's Indian"]
[Variation "Petrosian system, Keres variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7 8.
Bg5 h6 9. Bh4 g5 10. Bg3 Nh5 11. h4

[ECO "E94"]
[Opening "King's Indian"]
[Variation "Orthodox variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O

[ECO "E94"]
[Opening "King's Indian"]
[Variation "Orthodox, Donner variation"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O c6

[ECO "E94"]
[Opening "King's Indian"]
[Variation "Orthodox, 7...Nbd7"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7

[ECO "E95"]
[Opening "King's Indian"]
[Variation "Orthodox, 7...Nbd7, 8.Re1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 8.
Re1

[ECO "E96"]
[Opening "King's Indian"]
[Variation "Orthodox, 7...Nbd7, Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 8.
Re1 c6 9. Bf1 a5

[ECO "E97"]
[Opening "King's Indian"]
[Variation "Orthodox, Aronin-Taimanov variation (Yugoslav attack / Mar del Plata variation)"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6

[ECO "E97"]
[Opening "King's Indian"]
[Variation "Orthodox, Aronin-Taimanov, bayonet attack"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8.
d5 Ne7 9. b4

[ECO "E98"]
[Opening "King's Indian"]
[Variation "Orthodox, Aronin-Taimanov, 9.Ne1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8.
d5 Ne7 9. Ne1

[ECO "E99"]
[Opening "King's Indian"]
[Variation "Orthodox, Aronin-Taimanov, Main line"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8.
d5 Ne7 9. Ne1 Nd7 10. f3 f5

[ECO "E99"]
[Opening "King's Indian"]
[Variation "Orthodox, Aronin-Taimanov, Benko attack"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8.
d5 Ne7 9. Ne1 Nd7 10. f3 f5 11. g4