Encyclopaedia of Chess Openings Classification Code Index

A00: Uncommon Openings: 1.g3 (Benko Opening), 1.Nc3 (Sleipner Opening), 1.a3 (Anderssen's Opening), 1.b4 (Sokolsky Opening), 1.g4 (Grob's Attack), 1.h3 (Basmanic Defence), 1.c3 (Saragossa Opening), 1.d3 (Mieses Opening), 1.e3 (French Attack), 1.h4 (Desprez Opening), 1.a4 (Ware Opening), 1.Nh3 (Amar Opening), 1.Na3 (Durkin's Attack), 1.f3 (Gedult's Opening)

A01: Nimzowitsch-Larsen Attack: 1.b3

A02: Bird's Opening: 1.f4

A03: Bird's Opening: 1.f4 d5

A04: Reti Opening: 1.Nf3

A05: Reti Opening: 1.Nf3 Nf6

A06: Reti Opening: 1.Nf3 d5

A07: King's Indian Attack: 1.Nf3 d5 2.g3

A08: King's Indian Attack: 1.Nf3 d5 2.g3 c5 3.Bg2

A09: Reti Opening: 1.Nf3 d5 2.c4

A10: English: 1.c4

A11: English, Anglo-Slav System: 1.c4 c6

A12: English with b3: 1.c4 c6 2.Nf3 d5 3.b3

A13: English: 1.c4 e6

A14: English: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O

A15: English: 1.c4 Nf6

A16: English: 1.c4 Nf6 2.Nc3

A17: English: 1.c4 Nf6 2.Nc3 e6

A18: English, Mikenas-Carls: 1.c4 Nf6 2.Nc3 e6 3.e4

A19: English, Mikenas-Carls, Sicilian Variation: 1.c4 Nf6 2.Nc3 e6 3.e4 c5

A20: English: 1.c4 e5

A21: English: 1.c4 e5 2.Nc3

A22: English: 1.c4 e5 2.Nc3 Nf6

A23: English, Bremen System, Keres Variation: 1.c4 e5 2.Nc3 Nf6 3.g3 c6

A24: English, Bremen System with ...g6: 1.c4 e5 2.Nc3 Nf6 3.g3 g6

A25: English: 1.c4 e5 2.Nc3 Nc6

A26: English: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6

A27: English, Three Knights System: 1.c4 e5 2.Nc3 Nc6 3.Nf3

A28: English: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6

A29: English, Four Knights, Kingside Fianchetto: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 g3

A30: English, Symmetrical: 1.c4 c5

A31: English, Symmetrical, Benoni Formation: 1.c4 c5 2.Nf3 Nf6 3.d4

A32: English, Symmetrical Variation: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6

A33: English, Symmetrical: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6

A34: English, Symmetrical: 1.c4 c5 2.Nc3

A35: English, Symmetrical: 1.c4 c5 2.Nc3 Nc6

A36: English, Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7

A37: English, Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3

A38: English, Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6

A39: English, Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4

A40: Unusual Black responses to 1.d4: 1...e5 (Englund Gambit), 1...b5 (Polish Defence), 1...Nc6 (Nimzowitsch Defence), 1...g6 (Modern Defence without 2.e4), 1...e6 (French Indian Defence).

A41: Tartakower System: 1.d4 d6

A42: Tartakower System with 2.c4: 1.d4 d6 2.c4

A43: Various Benonis: 1.d4 c5

A44: Old Benoni: 1.d4 c5 2.d5 e5

A44: Semi-Benoni: 1.d4 c5 2.d5 e5 3.e4 d6

A45: Unusual Indian Openings: 1.d4 Nf6

A45: Trompowsky Attack: 1.d4 Nf6 2.Bg5

A46: Unusual Indian Openings with 2.Nf3: 1.d4 Nf6 2.Nf3

A47: Unusual Indian Openings with 2.Nf3: 1.d4 Nf6 2.Nf3 b6

A48: Torre Attack with 2...e6: 1.d4 Nf6 2.Nf3 e6 3.Bg5

A48: Torre Attack with 2...g6: 1.d4 Nf6 2.Nf3 g6 3.Bg5

A48: London System: 1.d4 Nf6 2.Nf3 e6 3.Bf4

A49: Fianchetto Variation: 1.d4 Nf6 2.Nf3 e6 3.g3

A50: Black Knights' Tango: 1.d4 Nf6 2.c4 Nc6

A51: Budapest Gambit Declined and Unusual Lines: 1.d4 Nf6 2.c4 e5

A52: Budapest Gambit Main Lines: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4

A53: Old Indian Defence: 1.d4 Nf6 2.c4 d6

A54: Old Indian Defence main lines: 1.d4 Nf6 2.c4 d6 3.Nc3 e5

A55: Old Indian Defence main lines: 1.d4 Nf6 2.c4 d6 3.Nc3 e5 4.Nf3

A56: Czech Benoni: 1.d4 Nf6 2.c4 c5 3.d5

A57: Benko/Volga Gambit sidelines: 1.d4 Nf6 2.c4 c5 3.d5 b5

A58: Benko/Volga Gambit Accepted: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5

A59: Benko/Volga Gambit Accepted (White castles by hand): 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.e4

A60: Modern Benoni and early divergences: 1.d4 Nf6 2.c4 c5 3.d5 e6

A61: Modern Benoni without early e4: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6

A62: Modern Benoni, Fianchetto Variation without early ...Nbd7: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3

A63: Modern Benoni, Fianchetto Variation sidelines: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2 O-O

A64: Modern Benoni, Fianchetto Variation main line: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2 O-O 9.O-O Re8 10.Nd2 Nbd7

A65: Modern Benoni, sidelines with early e4: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4

A66: Modern Benoni, Mikenas Attack: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.e5

A67: Modern Benoni, Taimanov Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5+

A68: Modern Benoni, Four Pawns Attack without 9...Re8: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 O-O 9.Bd3

A69: Modern Benoni, Four Pawns Attack with 9...Re8: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 O-O 9.Re8

A70: Modern Benoni, 7.Nf3: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3

A71: Modern Benoni, 7.Nf3 Bg7 8.Bg5 without Be2: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Bg5

A72: Modern Benoni, Classical Variation with Bg5: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.Bg5

A73: Modern Benoni, Classical Variation and unusual Black 9th moves: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O

A74: Modern Benoni, Classical Variation with 9...a6: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O a6

A75: Modern Benoni, Classical Variation main line: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O a6 10.a4 Bg4

A76: Modern Benoni, Classical Variation with 9...Re8 10.Qc2: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Qc2

A77: Modern Benoni, Classical Variation with 9...Re8 10.Nd2: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2

A78: Modern Benoni, Classical Variation with 10...Na6: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6

A79: Modern Benoni, Classical Variation with 10...Na6 11.f3: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6 11.f3

A80: Dutch Defence and unusual White second moves: 1.d4 f5

A81: Dutch Defence with 2.g3: 1.d4 f5 2.g3

A82: Dutch Defence, Staunton Gambit: 1.d4 f5 2.e4

A83: Dutch Defence, Staunton Gambit with 3.Nc3 Nf6 4.Bg5: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5

A84: Dutch Defence, 2.c4: 1.d4 f5 2.c4

A85: Dutch Defence, 2.c4 Nf6 3.Nc3: 1.d4 f5 2.c4 Nf6 3.Nc3

A86: Dutch Defence, Leningrad Variation sidelines: 1.d4 f5 2.c4 Nf6 3.g3

A87: Dutch Defence, Leningrad Variation with 5.Nf3: 1.d4 f5 2.c4 Nf6 3.g3 Nf6 3.g6 4.Bg2 Bg7 5.Nf3

A88: Dutch Defence, Leningrad Variation main line 7...c6: 1.d4 f5 2.c4 Nf6 3.g3 Nf6 3.g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6 7.Nc3 c6

A89: Dutch Defence, Leningrad Variation main line 7...Nc6: 1.d4 f5 2.c4 Nf6 3.g3 Nf6 3.g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6 7.Nc3 c6

A90: Dutch Defence sidelines and Stonewall: 1.d4 f5 2.c4 Nf6 3.g3 e6

A91: Dutch Defence, Classical Variation sidelines: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7

A92: Dutch Defence, Classical Stonewall with ...Be7 and early deviations: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3

A93: Dutch Defence, Classical Stonewall with 7.b3: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 d5 6.O-O O-O 7.b3

A94: Dutch Defence, Classical Stonewall with 7.b3 c6 8.Ba3: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 d5 6.O-O O-O 7.b3 c6 8.Ba3

A95: Dutch Defence, Classical Stonewall with 7.Nc3 c6: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 d5 6.O-O O-O 7.Nc3 c6

A96: Dutch Defence, Ilyin-Genevsky Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6

A97: Dutch Defence, Ilyin-Genevsky Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8

A98: Dutch Defence, Ilyin-Genevsky Variation with 8.Qc2: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8 8.Qc2

A99: Dutch Defence, Ilyin-Genevsky Variation with 8.b3: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8 8.b3

B00: Irregular Asymmetrical Responses to 1.e4: 1...a6 (St.George's Defence), 1...b6 (Owens' Defence), 1...f6 (Barnes Defence), 1...h6 (Carr Defence), 1...Na6 (Lemming Defence), 1...Nc6 (Nimzowitsch Defence), 1...Nh6 (Adams Defence), 1...a5 (Cornstalk Defence), 1...b5 (Polish Gambit), 1...f5 (Fred Defence), 1...g5 (Borg Defence), 1...h5 (Goldsmith Defence)

B01: Scandinavian Defence: 1.e4 d5

B02: Alekhine Defence: Unusual White third moves: 1.e4 Nf6 2.e5 Nd5 3.g3, 3.c4, 3.Nc3

B03: Alekhine Defence, Four Pawns' Attack: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.g3

B04: Alekhine Defence, Modern Variation: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3

B05: Alekhine Defence, Modern Variation: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4

B06: Modern Defence: 1.e4 g6

B07: Pirc Defence, Unusual White second and third moves: 1.e4 d6

B08: Pirc Defence, Two Knights: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3

B08: Pirc Defence, Two Knights (Schlechter): 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.h3

B08: Pirc Defence, Two Knights (Quiet): 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2

B09: Pirc Defence, Austrian Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4

B10: Caro-Kann Defence, Unusual White second moves: 1.e4 c6

B11: Caro-Kann Defence, Unusual Black second moves: 1.e4 c6 2.d4

B11: Caro-Kann Defence, Two Knights Variation: 1.e4 c6 2.Nc3

B12: Caro-Kann Defence, Classical Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5

B13: Caro-Kann Defence, Exchange Variation: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.Bd3

B13: Caro-Kann Defence, Panov-Botvinnik Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4

B14: Caro-Kann Defence, Panov-Botvinnik Attack with 5...e6: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 e6

B14: Caro-Kann Defence, Panov-Botvinnik Attack with 5...g6: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 g6

B15: Caro-Kann Defence, 3.Nc3 sidelines: 1.e4 c6 2.d4 d5 3.Nc3

B15: Caro-Kann Defence, Korchnoi Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6 exf6

B16: Caro-Kann Defence, Larsen-Bronstein Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6 gxf6

B17: Caro-Kann Defence, Modern Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7

B18: Caro-Kann Defence, Classical Variation sidelines: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5

B19: Caro-Kann Defence, Classical Variation main line: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3

B20: Sicilian Defence, Unusual White second moves: 1.e4 c5

B21: Sicilian Defence, 2.f4 Attack: 1.e4 c5 2.f4

B21: Sicilian Defence, Smith-Morra Gambit: 1.e4 c5 2.d4 cxd4 3.c3

B22: Sicilian Defence, Alapin Variation: 1.e4 c5 2.c3

B23: Sicilian Defence, Closed Sicilians without g3: 1.e4 c5 2.Nc3

B23: Sicilian Defence, Grand Prix Attack: 1.e4 c5 2.Nc3 Nc6 3.f4

B24: Closed Sicilian, 3.g3 sidelines: 1.e4 c5 2.Nc3 Nc6 3.g3

B25: Closed Sicilian, 3.g3 without early Be3: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7

B26: Closed Sicilian, 3.g3 with early Be3: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Be3

B27: Sicilian Defence, 2.Nf3 early deviations: 1.e4 c5 2.Nf3

B28: Sicilian Defence, O'Kelly Variation: 1.e4 c5 2.Nf3 a6

B29: Sicilian Defence, Nimzowitsch Variation: 1.e4 c5 2.Nf3 Nf6

B30: Sicilian Defence, Rossolimo Variation without ...g6: 1.e4 c5 2.Nf3 Nc6 3.Bb5

B31: Sicilian Defence, Rossolimo Variation with 3...g6: 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6

B32: Sicilian Defence, Löwenthal and Kalashnikov Variations: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5

B33: Sicilian Defence, Pelikan and Sveshnikov Variations: 1.1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5

B34: Sicilian Defence, Accelerated Dragon sidelines: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6

B35: Sicilian Defence, Accelerated Dragon main line: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4

B36: Sicilian Defence, Maroczy Bind, Gurgenidze System: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Nxd4 6.Qxd4

B37: Sicilian Defence, Maroczy Bind with 5...Bg7 sidelines: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7

B38: Sicilian Defence, Maroczy Bind with 5...Bg7 and 7...O-O: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 Nf6 7.Nc3 O-O

B39: Sicilian Defence, Maroczy Bind with 5...Bg7 main line: 1.e4 c5 2.Nc3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 Nf6 7.Nc3 Ng4 8.Qxg4 Nxd4

B40: Sicilian Defence, 2...e6 miscellaneous: 1.e4 c5 2.Nf3 e6

B41: Sicilian Defence, Kan Variation unusual lines: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6

B42: Sicilian Defence, Kan Variation with 5.Bd3: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3

B43: Sicilian Defence, Kan Variation with 5.Nc3: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3

B44: Sicilian Defence, Taimanov Variation with 5.Nb5: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5

B45: Sicilian Defence, Four Knights' Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6

B46: Sicilian Defence, Taimanov Variation with 5.Nc3: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3

B47: Sicilian Defence, Taimanov Variation with 5...Qc7: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7

B48: Sicilian Defence, Taimanov Variation with 6.Be3 a6 without Be2: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3 a6

B49: Sicilian Defence, Taimanov Variation with 6.Be3 a6 7.Be2: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3 a6 7.Be2

B50: Sicilian Defence, 2...d6 miscellaneous: 1.e4 c5 2.Nf3 d6

B51: Sicilian Defence, Moscow Variation early deviations: 1.e4 c5 2.Nf3 d6 3.Bb5

B52: Sicilian Defence, Moscow Variation with 3...Bd7: 1.e4 c5 2.Nf3 d6 3.Bb5 Bd7

B53: Sicilian Defence, Chekhover Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4

B54: Sicilian Defence, Unusual open lines: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4

B55: Sicilian Defence, Open lines with 5.f3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3

B56: Sicilian Defence, Unusual open lines: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3

B57: Classical Sicilian, Sozin Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4

B58: Classical Sicilian, Boleslavsky Variation with 7.Nf3: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 e5 7.Nf3

B59: Classical Sicilian, Boleslavsky Variation with 7.Nb3: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 e5 7.Nb3

B60: Classical Sicilian, Richter-Rauzer Variation sidelines: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5

B61: Classical Sicilian, Richter-Rauzer Variation with 6...Bd7 7.Qd2: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2

B62: Classical Sicilian, Richter-Rauzer Variation with 6...e6 sidelines: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6

B63: Classical Sicilian, Richter-Rauzer Variation with 7...Be7: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 Be7

B64: Classical Sicilian, Richter-Rauzer Variation without 9...Nxd4: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4

B65: Classical Sicilian, Richter-Rauzer Variation with 9...Nxd4: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4 Nxd4

B66: Classical Sicilian, Richter-Rauzer Variation with 7...a6 8.O-O-O h6: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2 a6 8.O-O-O h6

B67: Classical Sicilian, Richter-Rauzer Variation with 7...a6 and 8...Bd7: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2 a6 8.O-O-O Bd7

B68: Classical Sicilian, Richter-Rauzer Variation with 9.f4 Be7: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2 a6 8.O-O-O Bd7 9.f4 9.Be7

B69: Classical Sicilian, Richter-Rauzer Variation with 11.Bxf6: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2 a6 8.O-O-O Bd7 9.f4 9.Be7 10.Nf3 O-O 11.Bxf6

B70: Dragon Sicilian, early deviations: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6

B71: Dragon Sicilian, Levenfish Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.f4

B72: Dragon Sicilian, 6.Be3 without f3 and Qd2: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3

B73: Dragon Sicilian, Classical System without Nb3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O

B74: Dragon Sicilian, Classical System with Nb3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.Nb3

B75: Dragon Sicilian, Yugoslav Attack miscellaneous: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3

B76: Dragon Sicilian, Yugoslav Attack with 9.O-O-O: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.O-O-O

B76: Dragon Sicilian, Yugoslav attack with 9.g4: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.g4

B77: Dragon Sicilian, Yugoslav Attack with 9.Bc4 sidelines: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4

B78: Dragon Sicilian, Yugoslav Attack main line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Bd7 10.O-O-O Rc8

B78: Dragon Sicilian, Yugoslav Attack, Soltis Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Bd7 10.O-O-O Rc8 11.Bb3 Ne5 12.h4 h5

B79: Dragon Sicilian, Yugoslav Attack with 10...Qa5: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Bd7 10.O-O-O Qa5

B80: Scheveningen Sicilian, 6.g3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.g3

B80: Scheveningen Sicilian, 6.Be3 and English Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be3

B81: Scheveningen Sicilian, Keres Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.g4

B82: Scheveningen Sicilian with 6.f4: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.f4

B83: Scheveningen Sicilian, 6.Be2 without ...a6: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 Nc6 7.O-O Be7

B84: Scheveningen Sicilian, with 6.Be2 a6: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 a6

B85: Scheveningen Sicilian with 6.Be2 a6 and early Be3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 a6 7.Be3 Be7 8.O-O O-O 9.f4

B86: Scheveningen Sicilian, Sozin Variation without early ...b5: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4

B87: Scheveningen Sicilian, Sozin Variation with early ...b5: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 a6 7.Bb3 b5

B88: Sicilian Defence, Sozin Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4

B89: Sicilian Defence, Velimirović Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4 e6 7.f4 Bd7 8.Qe2

B90: Najdorf Sicilian, Unusual White sixth moves: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

B90: Najdorf Sicilian, English Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3

B90: Najdorf Sicilian, Fischer-Sozin Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4

B91: Najdorf Sicilian with 6.g3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.g3

B92: Najdorf Sicilian, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2

B93: Najdorf Sicilian with 6.f4: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4

B94: Najdorf Sicilian, old main line with 6...Nbd7: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 Nbd7

B95: Najdorf Sicilian, old main line, unusual White seventh moves: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6

B96: Najdorf Sicilian, old main line except 7...Qb6 or 7...Be7: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4

B97: Najdorf Sicilian, Poisoned Pawn Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6

B98: Najdorf Sicilian, 6.Bg5 e6 7.f4 Be7 sidelines: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7

B99: Najdorf Sicilian, 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7 9.O-O-O Nbd7 main line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7 9.O-O-O O-O-O

C00: French Defence, unusual White second moves: 1.e4 e6

C01: French Defence, Exchange Variation: 1.e4 e6 2.d4 d5 3.exd5 exd5

C02: French Defence, Advance Variation: 1.e4 e6 2.d4 d5 3.e5

C03: French Defence, Tarrasch Variation and unusual Black third moves: 1.e4 e6 2.d4 d5 3.Nd2

C04: French Defence, Tarrasch Variation with 3...Nc6: 1.e4 e6 2.d4 d5 3.Nd2 Nc6

C05: French Defence, Tarrasch Variation 3...Nf6 4.e5 Nfd7, unusual White fifth moves: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7

C06: French Defence, Tarrasch Variation 3...Nf6 4.e5 Nfd7 5.Bd3 main line: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3

C07: French Defence, Tarrasch Variation 3...c5, various White fourth moves: 1.e4 e6 2.d4 d5 3.Nd2 c5

C08: French Defence, Tarrasch Variation 3...c5 4.exd5 exd5 sidelines: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5

C09: French Defence, Tarrasch Variation 3...c5 main line: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5

5.Ngf3 Nc6

C10: French Defence, 3.Nc3 sidelines: 1.e4 e6 2.d4 d5 3.Nc3

C10: French Defence, Rubinstein Variation: 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4

C11: French Defence, Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5

C12: French Defence, MacCutcheon Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4

C13: French Defence, Burn Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4

C14: French Defence, Classical main line: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5

C15: French Defence, Winawer Variation sidelines: 1.e4 e6 2.d4 d5 3.Nc3 Bb4

C16: French Defence, Winawer Variation without ...c5: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5

C17: French Defence, Winawer Variation 4...c5 sidelines: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5

C18: French Defence, Winawer Variation with 6...Qc7: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Qc7

C19: French Defence, Winawer Variation main line 6...Ne7 7.Nf3 Qc7: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Nf3 Qc7

C20: Open games, various White second moves: 1.e4 e5

C21: Danish Gambit: 1.e4 e5 2.d4 exd4 3.c3

C22: Center Game: 1.e4 e5 2.d4 exd4 3.Qxd4

C23: Bishop's Opening, 2...Bc5: 1.e4 e5 2.Bc4 Bc5

C24: Bishop's Opening, 2...Nf6: 1.e4 e5 2.Bc4 Nf6

C25: Vienna Game, early deviations: 1.e4 e5 2.Nc3

C26: Vienna Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4

C27: Vienna Game, 2...Nf6 sidelines: 1.e4 e5 2.Nc3 Nf6

C28: Vienna Game, 2...Nf6 Bishop's Variation: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nc6

C29: Vienna Game, Classical main line: 1.e4 e5 2.Nc3 Nf6 3.f4

C30: King's Gambit: 1.e4 e5 2.f4

C31: Falkbeer Countergambit sidelines: 1.e4 e5 2.f4 d5 3.exd5

C32: Falkbeer Countergambit main line: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6

C33: King's Gambit Accepted sidelines: 1.e4 e5 2.f4 exf4

C33: King's Gambit Accepted, King's Bishop's Gambit: 1.e4 e5 2.f4 exf4 3.Bc4

C34: King's Gambit Accepted, King's Knight's Gambit sidelines: 1.e4 e5 2.f4 exf4 3.Nf3

C35: King's Gambit Accepted, Cunningham-Euwe Variation: 1.e4 e5 2.f4 exf4 3.Nf3 Be7

C36: King's Gambit Accepted, Modern Variation: 1.e4 e5 2.f4 exf4 3.Nf3 d5

C37: King's Gambit Accepted, Muzio Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3

C38: King's Gambit Accepted, Neumann's Defence: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7

C39: King's Gambit Accepted, Kieseritzky Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5

C40: Elephant Gambit: 1.e4 e5 2.Nf3 d5

C40: Latvian Gambit: 1.e4 e5 2.Nf3 f5

C41: Philidor Defence: 1.e4 e5 2.Nf3 d6

C42: Petroff Defence, unusual White third moves: 1.e4 e5 2.Nf3 Nf6

C42: Petroff Defence, 3.Nxe5 early deviations: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4

C42: Petroff Defence, 3.Nxe5 main line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3

C43: Petroff Defence, 3.d4: 1.e4 e5 2.Nf3 Nf6 3.d4

C44: Ponziani Opening: 1.e4 e5 2.Nf3 Nc6 3.c3

C44: Göring Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3

C44: Scotch Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 (4...Nf6--C55, 4...Bc5--C54/C56, 4...Be7--C50)

C45: Scotch Game: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4

C46: Three Knights' Game: 1.e4 e5 2.Nf3 Nc6 3.Nc3 (3...Nf6--C47)

C47: Four Knights' Game sidelines: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6

C48: Four Knights' Game, Belgrade Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4

C48: Four Knights' Game, Spanish Variation sidelines: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5

C48: Four Knights' Game, Rubinstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4

C48: Four Knights' Game, Marshall Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5

C48: Four Knights' Game, Symmetrical Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6

C49: Four Knights' Game, Symmetrical Variation main line: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6

C50: Hungarian Defence: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7

C50: Italian Game: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5

C50: Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3

C51: Evans' Gambit sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4

C52: Evans' Gambit main line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5

C53: Giuoco Piano, 4.c3 sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3

C54: Giuoco Piano, 4.c3 Nf6 5.d4 main line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+

C54: Giuoco Piano, Wing Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.b4

C54: Giuoco Piano, Modern System: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3

C55: Two Knights' Defence, 4.d3: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3

C56: Two Knights' Defence, Max Lange Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6. e57.

C56: Two Knights' Defence, Modern Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.e5

C57: Two Knights' Defence, Polerio Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5

C57: Two Knights' Defence, Wilkes-Barre Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5

C57: Two Knights' Defence, Fritz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nd4 6.c3 b5 7.Bf1 Nxd5

C57: Two Knights' Defence, Fried Liver Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7

C58: Two Knights' Defence, 5...Na5 sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6. Bb5+ c6 7.dxc6 bxc67.

C59: Two Knights' Defence, 5...Na5 main line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2

C60: Ruy Lopez, early deviations: 1.e4 e5 2.Nf3 Nc6 3.Bb5

C60: Ruy Lopez, Smyslov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6

C60: Ruy Lopez, Cozio System: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7

C61: Ruy Lopez, Bird's Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4

C62: Ruy Lopez, Steinitz Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6

C63: Ruy Lopez, Schliemann Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5

C64: Ruy Lopez, Classical Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 (4.O-O Nf6--C65)

C65: Ruy Lopez, Berlin Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6

C65: Ruy Lopez, Classical Berlin Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5

C66: Ruy Lopez, Berlin Defence with 4...d6: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6

C67: Ruy Lopez, Berlin Defence main line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4

C68: Ruy Lopez, Exchange Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6

C69: Ruy Lopez, Exchange Variation with 5.O-O f6: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O f6

C70: Ruy Lopez, Norwegian Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Na5

C70: Ruy Lopez, Delayed Schliemann Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 f5

C71: Ruy Lopez, Deferred Steinitz Defence sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6

C72: Ruy Lopez, Deferred Steinitz Defence with 5.O-O: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 O-O

C73: Ruy Lopez, Deferred Steinitz Defence with 5.Bxc6+: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+

C74: Ruy Lopez, Deferred Steinitz Defence with 5.c3 f5: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5

C75: Ruy Lopez, Deferred Steinitz Defence with 5.c3 Bd7 6.d4 without ...g6: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7 6.d4

C76: Ruy Lopez, Deferred Steinitz Defence 5.c3 Bd7 6.d4 g6 main line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4. Ba4 d6 5.c3 Bd7 6.d4 g6 7.O-O Bg75.

C77: Ruy Lopez, 3...a6 4.Ba4 Nf6 sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6

C78: Ruy Lopez, Möller Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Bc5

C78: Ruy Lopez, Arkhangelsk Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 6.Bb3 Bb7

C79: Ruy Lopez, Russian Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O d6

C80: Open Ruy Lopez sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4

C80: Open Ruy Lopez with 9.Nbd2: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2

C81: Open Ruy Lopez, Keres Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2

C82: Open Ruy Lopez, Italian Defence: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5

C83: Open Ruy Lopez, 9.c3 main line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7

C84: Closed Ruy Lopez, sixth move sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7

C85: Closed Ruy Lopez, Deferred Exchange Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Bxc6 dxc6

C86: Closed Ruy Lopez, Worrall Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Qe2

C87: Closed Ruy Lopez, 6...d6: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 d6

C88: Closed Ruy Lopez, Anti-Marshall Systems: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O (8.c3 d6--C90-C99, 8.c3 d5--C89)

C89: Closed Ruy Lopez, Marshall Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5

C90: Closed Ruy Lopez with 7...d6, early deviations: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6

C91: Closed Ruy Lopez, 7...d6 without 9.h3: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.d4

C92: Closed Ruy Lopez, 9.h3 sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3

C92: Closed Ruy Lopez, Bulgarian Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nd7

C92: Closed Ruy Lopez, Zaitsev Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Bb7

C93: Closed Ruy Lopez, Smyslov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 h6

C94: Closed Ruy Lopez, Breyer Variation with 10.d3: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d3

C95: Closed Ruy Lopez, Breyer Variation with 10.d4: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4

C96: Closed Ruy Lopez, Chigorin Variation without 11...Qc7: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 d4

C97: Closed Ruy Lopez, 11...Qc7 sidelines: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7

C98: Closed Ruy Lopez, Chigorin Defence with 12...Nc6: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6

C99: Closed Ruy Lopez, Chigorin Defence main line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 cxd4 13.cxd4

D00: 1.d4 d5 unusual lines: 1.d4 d5

D01: Veresov Opening: 1.d4 d5 2.Nc3 Nf6 3.Bg5

D02: 1.d4 d5 2.Nf3 sidelines: 1.d4 d5 2.Nf3 (2...f5--A80)

D03: Torre System: 1.d4 d5 2.Nf3 Nf6 3.Bg5

D04: Colle System: 1.d4 d5 2.Nf3 Nf6 3.e3

D05: Colle System with ...e6: 1.d4 d5 2.Nf3 Nf6 3.e3 e6

D06: Queen's Gambit, Marshall Defence: 1.d4 d5 2.c4 Nf6 3.cxd5

D06: Queen's Gambit, Baltic Defence: 1.d4 d5 2.c4 Bf5

D07: Queen's Gambit, Chigorin Defence: 1.d4 d5 2.c4 Nc6

D08: Queen's Gambit, Albin Countergambit sidelines: 1.d4 d5 2.c4 e5

D09: Queen's Gambit, Albin Countergambit main line: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.g3

D10: Slav Defence sidelines: 1.d4 d5 2.c4 c6

D10: Slav Defence, Exchange Variation: 1.d4 d5 2.c4 c6 3.cxd5

D10: Slav Defence, Winawer Countergambit: 1.d4 d5 2.c4 c6 3.Nc3 e5

D11: Slav Defence, 3.Nf3 sidelines: 1.d4 d5 2.c4 c6 3.Nf3

D11: Slav Defence, 3.Nf3 Nf6 4.e3 Bg4: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 e3 Bg4

D12: Slav Defence, 4.e3 Bf5: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5

D13: Slav Defence, Classical Exchange Variation without ...Bf5: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5

D14: Slav Defence, Classical Exchange Variation main line: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Nc3 Nc6 6.Bf4 Bf5

D15: Slav Defence 4.Nc3 a6: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6

D15: Slav Defence 4.Nc3 dxc4 gambit lines: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4

D16: Slav Defence, Smyslov System: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Na6

D16: Slav Defence, Bronstein System: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bg4

D17: Slav Defence, 5...Bf5 sidelines: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5

D17: Slav Defence, Carlsbad Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Nbd7 7.Nxc4 Qc7

D17: Slav Defence, Wiesbaden Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 e6 7.f3

D18: Slav Defence, Euwe Variation without Qe2: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3

D19: Slav Defence, Euwe Variation main line: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O O-O 9.Qe2

D20: Queen's Gambit Accepted with 3.e3: 1.d4 d5 2.c4 dxc4 3.e3

D20: Queen's Gambit Accepted with 3.e4: 1.d4 d5 2.c4 dxc4 3.e4

D21: Queen's Gambit Accepted, 3.Nf3 sidelines: 1.d4 d5 2.c4 dxc4 3.Nf3

D22: Queen's Gambit Accepted, 3.Nf3 a6 4.e3: 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3

D23: Queen's Gambit Accepted, 3.Nf3 Nf6 sidelines: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6

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

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

D26: Queen's Gambit Accepted, 4.e3 e6 5.Bxc4 c5 sidelines: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 4.e6 5.Bxc4 c5

D27: Queen's Gambit Accepted, Classical main line with 7.e4!?: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 4.e6 5.Bxc4 c5 6.O-O a6 7.e4

D27: Queen's Gambit Accepted, Classical main line with 7.a4: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 4.e6 5.Bxc4 c5 6.O-O a6 7.a4

D28: Queen's Gambit Accepted, Classical main line with 7.Qe2 and early ...Nc6: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 4.e6 5.Bxc4 c5 6.O-O a6 7.Qe2 Nc6

D29: Queen's Gambit Accepted, Classical main line with 7.Qe2 and early ...Nbd7: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 4.e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 8.Bb3 Bb7 9.Rd1 Nbd7

D30: Queen's Gambit Declined without 3.Nc3: 1.d4 d5 2.c4 e6

D31: Queen's Gambit Declined, Alatortsev Variation: 1.d4 d5 2.c4 e6 3.Nc3 Be7

D31: Semi-Slav without ...Nf6: 1.d4 d5 2.c4 e6 3.Nc3 c6

D32: Tarrasch Defence sidelines: 1.d4 d5 2.c4 e6 3.Nc3 c5

D33: Tarrasch Defence, 6.g3 sidelines: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd5 5.Nf3 Nc6 6.g3

D34: Tarrasch Defence, 6.g3 Nf6 7.Bg2 Be7: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7

D35: Queen's Gambit Declined, early deviations: 1.d4 d5 2.c4 e6 3.Nc3 Nf6

D35: Queen's Gambit Declined, Exchange Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5

D36: Queen's Gambit Declined, Exchange Variation main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 Be7 6.Qc2

D37: Queen's Gambit Declined with 5.Bf4: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4.Be7 5.Bf4

D38: Queen's Gambit Declined, Ragozin Defence: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4.Bb4

D39: Queen's Gambit Declined, Ragozin Defence with 5.Bg5 dxc4: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4.Bb4 5.Bg5 dxc4

D40: Queen's Gambit Declined, Semi-Tarrasch Defence: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4.c5

D41: Queen's Gambit Declined, Semi-Tarrasch Defence with 5.cxd5: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4.c5 5.cxd5 Nxd5

D42: Queen's Gambit Declined, Semi-Tarrasch Defence main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 4.c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bd3

D43: Semi-Slav, 5.Bg5 h6: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 h6

D44: Semi-Slav, Botvinnik Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5

D45: Semi-Slav, 5.e3: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3

D46: Semi-Slav, 5.e3 Nbd7 6.Bd3 where Black avoids the Meran: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3

D47: Semi-Slav, Meran System sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4

D48: Semi-Slav, Meran System without early ...c5: 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.O-O

D49: Semi-Slav, Meran System main line: 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 axb5 12.exf6 gxf6

D50: Queen's Gambit Declined, Dutch-Peruvian Gambit: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5

D50: Queen's Gambit Declined, Orthodox Variation sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5

D51: Queen's Gambit Declined, 4.Bg5 Nbd7 sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7

D52: Queen's Gambit Declined, Cambridge Springs Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5

D53: Queen's Gambit Declined, Orthodox Variation early deviations: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7

D54: Queen's Gambit Declined, Orthodox Variation without Nf3: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Rc1

D55: Queen's Gambit Declined, Orthodox Variation without ...h6: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3

D56: Queen's Gambit Declined, Lasker Variation sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4

D57: Queen's Gambit Declined, Lasker Variation 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 exd5

D58: Queen's Gambit Declined, Tartakower Defence sidelines: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6

D59: Queen's Gambit Declined, Tartakower Defence main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6 8.cxd5 Nxd5

D60: Queen's Gambit Declined, Classical Variation with unusual White seventh moves: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7

D61: Queen's Gambit Declined, Classical Variation with 7.Qc2: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Qc2

D62: Queen's Gambit Declined, Classical Variation with 7.Qc2 c5 8.cxd5: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Qc2 c5 8.cxd5

D63: Queen's Gambit Declined, Classical Variation with 7.Rc1: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1

D64: Queen's Gambit Declined, Classical Variation with 7.Rc1 c6 8.Qc2: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2

D65: Queen's Gambit Declined, Classical Variation with 7.Rc1 c6 8.Qc2 a6 9.cxd5: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 a6 9.cxd5

D66: Queen's Gambit Declined, Classical Variation main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3

D67: Queen's Gambit Declined, 9...Nd5: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5

D68: Queen's Gambit Declined, Capablanca's Freeing Maneuver: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.O-O Nxc3 12.Rxc3 e5

D69: Queen's Gambit Declined, Capablanca's Freeing Maneuver main line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Nbd7 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.O-O Nxc3 12.Rxc3 e5 13.dxe5

D70: Grünfeld Defence, unusual White third moves met by 3...d5: 1.d4 Nf6 2.c4 g6 (3.Nc3--E20-E99)

D71: Grünfeld Defence, Fianchetto Variation sidelines: 1.d4 Nf6 2.c4 g6 3.g3 d5

D72: Grünfeld Defence, Fianchetto Variation without Nf3: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.cxd5 Nxd5 6.e4

D73: Grünfeld Defence, Fianchetto Variation with 5.Nf3 sidelines: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3

D74: Grünfeld Defence, Fianchetto Variation with 5.Nf3 O-O main line: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.cxd5 Nxd5 7.O-O

D75: Grünfeld Defence, Fianchetto Variation with 5.Nf3 O-O 6.cxd5 Nxd5 7.Nc3 c5: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.cxd5 Nxd5 7.Nc3 c5

D76: Grünfeld Defence, Fianchetto Variation main line with 7.O-O Nb6: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.cxd5 Nxd5 7.O-O Nb6

D77: Grünfeld Defence, Fianchetto Variation 6.O-O without 6...c6: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O

D78: Grünfeld Defence, Fianchetto Variation with 6.O-O c6: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6

D79: Grünfeld Defence, Symmetrical Variation: 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 d5 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5

D80: Grünfeld Defence, unusual White fourth moves: 1.d4 Nf6 2.c4 g6 3.Nc3 d5

D80: Grünfeld Defence, 4.Bg5: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5

D81: Grünfeld Defence, Accelerated Russian System: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Qb3

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

D83: Grünfeld Defence, 4.Bf4 Bg7 5.e3 O-O: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O

D84: Grünfeld Defence, 4.Bf4 Bg7 5.e3 O-O 6.cxd5: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.cxd5

D85: Grünfeld Defence, Nadanian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Na4

D85: Grünfeld Defence, Exchange Variation with 7.Nf3: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3

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

D87: Grünfeld Defence, Classical Exchange Variation without ...cxd4: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 O-O 9.O-O

D88: Grünfeld Defence, Classical Exchange Variation with 10.Be3 cxd4 11.cxd4: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 O-O 9.O-O

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

D90: Grünfeld Defence, 4.Nf3 Bg7 sidelines: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7

D91: Grünfeld Defence, 4.Nf3 Bg7 5.Bg5: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bg5

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

D93: Grünfeld Defence, 4.Nf3 Bg7 5.Bf4 main line: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bf4 O-O 6.e3

D94: Grünfeld Defence, Closed Variation sidelines: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3

D95: Grünfeld Defence, Closed Variation main line: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.Qb3

D96: Grünfeld Defence, Russian System sidelines: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3

D97: Grünfeld Defence, Russian System main line without 7...Bg4: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4

D98: Grünfeld Defence, Russian System, Smyslov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4 8.Be3 Nfd7

D99: Grünfeld Defence, Russian System main line: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4 8.Be3 Nfd7 9.Qb3

E00: Various Indian Defences: 1.d4 Nf6

E01: Catalan Opening, early deviations: 1.d4 Nf6 2.c4 e6 3.g3 d5

E02: Open Catalan with 5.Qa4+: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 dxc4 5.Qa4+

E03: Open Catalan, 5.Qa4+ Nbd7 6.Qxc4: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 dxc4 5.Qa4+ Nbd7 6.Qxc4

E04: Open Catalan, 5.Nf3: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 dxc4 5.Nf3

E05: Open Catalan, 5.Nf3 main line: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 dxc4 5.Nf3 Be7 6.O-O O-O

E06: Closed Catalan sidelines: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 Be7

E07: Closed Catalan, 5.Bg2 O-O 6.O-O Nbd7: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 Be7 5.Bg2 O-O 6.O-O Nbd7

E08: Closed Catalan, 7.Qc2: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 Be7 5.Bg2 O-O 6.O-O Nbd7 7.Qc2

E09: Closed Catalan, main line: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 Be7 5.Bg2 O-O 6.O-O Nbd7 7.Qc2 c6 8.Nbd2

E10: Blumenfeld Gambit: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nf3 b5

E11: Bogo-Indian Defence: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+

E12: Queen's Indian Defence: 1.d4 Nf6 2.c4 e6 3.Nf3 b6

E13: Queen's Indian Defence, 4.Nc3, Main line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3

E14: Queen's Indian Defence, 4.e3 : 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3

E15: Queen's Indian Defence, 4.g3 : 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3

E16: Queen's Indian Defence, Capablanca Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+

E17: Queen's Indian Defence, 5.Bg2 Be7: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7

E18: Queen's Indian Defence, 5.Bg2 Be7: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3

E19 Queen's Indian, 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

E20 Nimzo-Indian Defence: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4

E21 Nimzo-Indian, Three knights variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3

E22 Nimzo-Indian, Spielmann Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3

E23 Nimzo-Indian, Spielmann, 4...c5, 5.dc Nc6: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6

E24 Nimzo-Indian, Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3

E25 Nimzo-Indian, Sämisch Variation, Keres Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.f3 d5 7.cxd5

E26 Nimzo-Indian, Sämisch Variation, 4.a3 Bxc3+ 5.bxc3 c5 6.e3: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.e3

E27 Nimzo-Indian, Sämisch Variation, 5...0-0: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O

E28 Nimzo-Indian, Sämisch Variation, 6.e3: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O 6.e3

E29 Nimzo-Indian, Sämisch Variation, Main line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O 6.e3 c5 7.Bd3 Nc6

E30 Nimzo-Indian, Leningrad Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5

E31 Nimzo-Indian, Leningrad Variation, main line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 d6

E32 Nimzo-Indian, Classical Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2

E33 Nimzo-Indian, Classical Variation, 4...Nc6: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 Nc6

E34 Nimzo-Indian, Classical, Noa Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5

E35 Nimzo-Indian, Classical, Noa Variation, 5.cxd5 exd5: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 exd5

E36 Nimzo-Indian, Classical, Noa Variation, 5.a3: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3

E37 Nimzo-Indian, 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

E38 Nimzo-Indian, Classical, 4...c5: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5

E39 Nimzo-Indian, Classical, Pirc Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O

E40 Nimzo-Indian, 4.e3: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3

E41 Nimzo-Indian, 4.e3 c5: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5

E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein): 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2

E43 Nimzo-Indian, Fischer Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6

E44 Nimzo-Indian, Fischer Variation, 5.Ne2: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2

E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2 Ba6

E46 Nimzo-Indian, 4.e3 O-O: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O

E47 Nimzo-Indian, 4.e3 O-O, 5.Bd3: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3

E48 Nimzo-Indian, 4.e3 O-O, 5.Bd3 d5: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5

E49 Nimzo-Indian, 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

E50 Nimzo-Indian, 4.e3 O-O, 5.Nf3, without ...d5: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3

E51 Nimzo-Indian, 4.e3 O-O, 5.Nf3 d5: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5

E52 Nimzo-Indian, 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

E53 Nimzo-Indian, 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

E54 Nimzo-Indian, 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

E55 Nimzo-Indian, 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

E56 Nimzo-Indian, 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

E57 Nimzo-Indian, 4.e3, Main line with 8...dxc4 and 9...Bxc4 cxd4: 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

E58 Nimzo-Indian, 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

E59 Nimzo-Indian, 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

E60 King's Indian Defence: 1.d4 Nf6 2.c4 g6

E61 King's Indian Defence, 3.Nc3: 1.d4 Nf6 2.c4 g6 3.Nc3

E62 King's Indian, Fianchetto Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3

E63 King's Indian, Fianchetto, Panno Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6 7.O-O a6

E64 King's Indian, Fianchetto, Yugoslav System: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 c5

E65 King's Indian, Yugoslav, 7.O-O: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 c5 7.O-O

E66 King's Indian, Fianchetto, Yugoslav Panno: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 c5 7.O-O Nc6 8.d5

E67 King's Indian, Fianchetto with ...Nd7: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nbd7

E68 King's Indian, Fianchetto, Classical Variation, 8.e4: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nbd7 7.O-O e5 8.e4

E69 King's Indian, Fianchetto, Classical Main line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bd7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nbd7 7.O-O e5 8.e4 c6 9.h3

E70 King's Indian, 4.e4: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4

E71 King's Indian, Makogonov System (5.h3): 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.h3

E72 King's Indian with e4 & g3: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.g3

E73 King's Indian, 5.Be2: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2

E74 King's Indian, Averbakh, 6...c5: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 c5

E75 King's Indian, Averbakh, Main line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 c5 7.d5

c6

E76 King's Indian Defence, Four Pawns Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4

E77 King's Indian, Four Pawns Attack, with Be2: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 O-O 6.Be2

E78 King's Indian, 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

E79 King's Indian, 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

E80 King's Indian, Sämisch Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3

E81 King's Indian, Sämisch, 5...O-O: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O

E82 King's Indian, Sämisch, double Fianchetto Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 b6

E83 King's Indian, Sämisch, 6...Nc6: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 Nc6

E84 King's Indian, Sämisch, 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

E85 King's Indian, Sämisch, Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5

E86 King's Indian, Sämisch, 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

E87 King's Indian, Sämisch, Orthodox, 7.d5: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.d5

E88 King's Indian, Sämisch, 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

E89 King's Indian, Sämisch, 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

E90 King's Indian, 5.Nf3: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3

E91 King's Indian, 6.Be2: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2

E92 King's Indian, Classical Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5

E93 King's Indian, 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

E94 King's Indian, Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-

O

E95 King's Indian, 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

E96 King's Indian, 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

E97 King's Indian, 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

E98 King's Indian, 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

E99 King's Indian, Orthodox, Aronin-Taimanov, Main: 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