A11 Anglo-Slav, English; A11 1.c4 c6
A12 A12 1.c4 c6 2.Nf3 d5 3.b3
A12 Bled Variation, English 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.g3 g6
A13 Agincourt; Kurajica Defense, English; A13 1.c4 e6
A13 English Defense 1.c4 e6 2.d4 b6
A13 King's Knight Variation, English 1.c4 e6 2.Nf3 d5
A13 Wimpy System, English 1.c4 e6 2.Nf3 d5 3.b3 Nf6 4.Bb2 c5 e3
A13 Afincourt Variation, English 1.c4 e6 2.Nf3 d5 3.g3
A13 Kurajica Defense, English 1.c4 e6 2.Nf3 d5 3.g3 c6
A13 Neo Catalan, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6
A13 Neo Catalan Accepted, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 dxc4
A13 Romanishin Gambit, English 1.c4 e6 2.Nf3 Nf6 3.g3 a6 4.Bg2 b5
A14 A14 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7
A14 Neo Catalan Declined, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O
A14 Keres Defense, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O c5 6.cxd5 Nxd5 7.Nc3 Nc6
A15 Anglo System, English; A15 1.c4 Nf6
A15 Mikenas-Carls Variation, English 1.c4 Nf6
A15 English Orangutan 1.c4 Nf6 2.b4
A15 Shirazi Shove 1.c4 Nf6 2.g3 h5
A15 King's Knight Variation, English 1.c4 Nf6 2.Nf3
A15 Romanishin Variation, English 1.c4 Nf6 2.Nf3 e6 3.g3 a6
A16 A16 1.c4 Nf6 2.Nc3
A16 Golombek Defense, English; Anti English 1.c4 Nf6 2.Nc3 d5
A16 Czech Variation, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nb6
A16 Korchnoi's Variation, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.g3 Bg7 6.Bg2 e5
A16 Stein Attack, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.Qa4+
A16 Anti-anti-grunfeld 1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.e4
A17 Smyslov Defense, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nxc3
A17 Hegehog System, Anglo-Indian English; A17 1.c4 Nf6 2.Nc3 e6
A17 Nimzo-English Opening 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4
A17 Zviagintsev-Krasenkov Attack, English 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 4.g4
A18 Flohr-Mikenas-Carls Variation, English; A18 1.c4 Nf6 2.Nc3 e6 3.e4
A18 Kevitz Defense, English 1.c4 Nf6 2.Nc3 e6 3.e4 Nc6
A18 Queen's Indian Formation, English 1.c4 Nf6 2.Nc3 e6 3.Nf3 b6
A19 Floh-Mikenas-Carls Variation, English; A19 1.c4 Nf6 2.Nc3 e6 3.e4 c5
A19 Nei Gambit, English 1.c4 Nf6 2.Nc3 e6 3.e4 c5 4.e5 Ng8
A20 King's English; A20 1.c4 e5
A20 Kahiko-Hula Gambit, English 1.c4 e5 2.e3 Nf6 4.f4 exf4 4.Nf3
A20 Double Whammy, English 1.c4 e5 2.f4
A20 Drill Variation, English 1.c4 e5 2.g3 h5
A20 Nimzovich Variation, English 1.c4 e5 2.Nf3
A20 Nimzovich-Flohr Variation, English 1.c4 e5 2.Nf3 e4
A20 English Queen 1.c4 e5 2.Qa4
A21 Reversed Sicilian, English; A21 1.c4 e5 2.Nc3
A21 Kramnik-Shirov Variation, English 1.c4 e5 2.Nc3 Bb4
A21 Troger Variation, English 1.c4 e5 2.Nc3 d6 3.g3 Be6 4.Bg2 Nc6
A21 Keres Defense, English 1.c4 e5 2.Nc3 d6 3.g3 c6
A21 General Variation, King's English 1.c4 e5 2.Nc3 d6 3.Nf3
A21 Smyslov Variation, English 1.c4 e5 2.Nc3 d6 3.Nf3 Bg4
A21 Anglo-Dutch 1.c4 e5 2.Nc3 f5
A22 Two Knights Variation, English; A22 1.c4 e5 2.Nc3 Nf6
A22 Mazedonisch Variation, English 1.c4 e5 2.Nc3 Nf6 3.f4
A22 Bremen; Carls Variation, English 1.c4 e5 2.Nc3 Nf6 3.g3
A22 Kapengut; Smyslov; Modern V, English 1.c4 e5 2.Nc3 Nf6 3.g3 Bb4
A22 Bellon Gambit, English 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 b5
A22 Erbenheimer Gambit, English 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 Ng4
A23 Keres Variation, English; A23 1.c4 e5 2.Nc3 Nf6 3.g3 c6
A23 Reversed Dragon, English 1.c4 e5 2.Nc3 Nf6 3.g3 d5
A24 Fianchetto Lines, Two Knights Variation, English; A24 1.c4 e5 2.Nc3 Nf6 3.g3 g6
A24 Prickly Pawn Pass System, English 1.c4 e5 2.Nc3 Nf6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4 O-O 7.Nge2 c6 8.O-O a6
A25 Reversed Closed Sicilian, English; A25 1.c4 e5 2.Nc3 Nc6
A25 Troger Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Be6
A25 Taimanov Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7
A25 Hungarian Attack, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 4.Rb1
A25 Closed System, Full Symmetry, King's English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6
A25 Botvinnik System, King's English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4
A25 Bremen-Hort Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Be6
A25 Botvinnik Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4
A26 Closed System, King's English; A26 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3
A27 Three Knights System, English; A27 1.c4 e5 2.Nc3 Nc6 3.Nf3
A28 Four Knights Variation, English; A28 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6
A28 Korchnoi Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.a3
A28 Flexible Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d3
A28 Bradley Beach Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 e4
A28 Four Knights Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 exd4 5.Nxd4Bb4 6.Bg5 h6 7.Bh4 Bxc3+ 8.bxc3 Ne5
A28 Quiet Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3
A28 Romanishin Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 Bxc3
A28 Keene; Stean Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 O-O 6.Nd5 Re8 7.Qf5
A28 Botvinnik Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e4
A29 Fianchetto Line, Four Knights English; A29 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3
A30 Symmetrical Defense, English; A30 1.c4 c5
A30 Wing Variation, English 1.c4 c5 2.b4
A30 Napolitano Gambit, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.b4
A30 Hedgehog Variation, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7
A30 Double Fianchetto Defense, English 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O g6
A31 Anti-Benoni Variation, Symmetrical English; A31 1.c4 c5 2.Nf3 Nf6 3.d4
A12 A12 1.c4 c6 2.Nf3 d5 3.b3
A12 Bled Variation, English 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.g3 g6
A13 Agincourt; Kurajica Defense, English; A13 1.c4 e6
A13 English Defense 1.c4 e6 2.d4 b6
A13 King's Knight Variation, English 1.c4 e6 2.Nf3 d5
A13 Wimpy System, English 1.c4 e6 2.Nf3 d5 3.b3 Nf6 4.Bb2 c5 e3
A13 Afincourt Variation, English 1.c4 e6 2.Nf3 d5 3.g3
A13 Kurajica Defense, English 1.c4 e6 2.Nf3 d5 3.g3 c6
A13 Neo Catalan, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6
A13 Neo Catalan Accepted, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 dxc4
A13 Romanishin Gambit, English 1.c4 e6 2.Nf3 Nf6 3.g3 a6 4.Bg2 b5
A14 A14 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7
A14 Neo Catalan Declined, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O
A14 Keres Defense, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O c5 6.cxd5 Nxd5 7.Nc3 Nc6
A15 Anglo System, English; A15 1.c4 Nf6
A15 Mikenas-Carls Variation, English 1.c4 Nf6
A15 English Orangutan 1.c4 Nf6 2.b4
A15 Shirazi Shove 1.c4 Nf6 2.g3 h5
A15 King's Knight Variation, English 1.c4 Nf6 2.Nf3
A15 Romanishin Variation, English 1.c4 Nf6 2.Nf3 e6 3.g3 a6
A16 A16 1.c4 Nf6 2.Nc3
A16 Golombek Defense, English; Anti English 1.c4 Nf6 2.Nc3 d5
A16 Czech Variation, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nb6
A16 Korchnoi's Variation, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.g3 Bg7 6.Bg2 e5
A16 Stein Attack, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.Qa4+
A16 Anti-anti-grunfeld 1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.e4
A17 Smyslov Defense, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nxc3
A17 Hegehog System, Anglo-Indian English; A17 1.c4 Nf6 2.Nc3 e6
A17 Nimzo-English Opening 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4
A17 Zviagintsev-Krasenkov Attack, English 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 4.g4
A18 Flohr-Mikenas-Carls Variation, English; A18 1.c4 Nf6 2.Nc3 e6 3.e4
A18 Kevitz Defense, English 1.c4 Nf6 2.Nc3 e6 3.e4 Nc6
A18 Queen's Indian Formation, English 1.c4 Nf6 2.Nc3 e6 3.Nf3 b6
A19 Floh-Mikenas-Carls Variation, English; A19 1.c4 Nf6 2.Nc3 e6 3.e4 c5
A19 Nei Gambit, English 1.c4 Nf6 2.Nc3 e6 3.e4 c5 4.e5 Ng8
A20 King's English; A20 1.c4 e5
A20 Kahiko-Hula Gambit, English 1.c4 e5 2.e3 Nf6 4.f4 exf4 4.Nf3
A20 Double Whammy, English 1.c4 e5 2.f4
A20 Drill Variation, English 1.c4 e5 2.g3 h5
A20 Nimzovich Variation, English 1.c4 e5 2.Nf3
A20 Nimzovich-Flohr Variation, English 1.c4 e5 2.Nf3 e4
A20 English Queen 1.c4 e5 2.Qa4
A21 Reversed Sicilian, English; A21 1.c4 e5 2.Nc3
A21 Kramnik-Shirov Variation, English 1.c4 e5 2.Nc3 Bb4
A21 Troger Variation, English 1.c4 e5 2.Nc3 d6 3.g3 Be6 4.Bg2 Nc6
A21 Keres Defense, English 1.c4 e5 2.Nc3 d6 3.g3 c6
A21 General Variation, King's English 1.c4 e5 2.Nc3 d6 3.Nf3
A21 Smyslov Variation, English 1.c4 e5 2.Nc3 d6 3.Nf3 Bg4
A21 Anglo-Dutch 1.c4 e5 2.Nc3 f5
A22 Two Knights Variation, English; A22 1.c4 e5 2.Nc3 Nf6
A22 Mazedonisch Variation, English 1.c4 e5 2.Nc3 Nf6 3.f4
A22 Bremen; Carls Variation, English 1.c4 e5 2.Nc3 Nf6 3.g3
A22 Kapengut; Smyslov; Modern V, English 1.c4 e5 2.Nc3 Nf6 3.g3 Bb4
A22 Bellon Gambit, English 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 b5
A22 Erbenheimer Gambit, English 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 Ng4
A23 Keres Variation, English; A23 1.c4 e5 2.Nc3 Nf6 3.g3 c6
A23 Reversed Dragon, English 1.c4 e5 2.Nc3 Nf6 3.g3 d5
A24 Fianchetto Lines, Two Knights Variation, English; A24 1.c4 e5 2.Nc3 Nf6 3.g3 g6
A24 Prickly Pawn Pass System, English 1.c4 e5 2.Nc3 Nf6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4 O-O 7.Nge2 c6 8.O-O a6
A25 Reversed Closed Sicilian, English; A25 1.c4 e5 2.Nc3 Nc6
A25 Troger Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Be6
A25 Taimanov Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7
A25 Hungarian Attack, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 4.Rb1
A25 Closed System, Full Symmetry, King's English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6
A25 Botvinnik System, King's English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4
A25 Bremen-Hort Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Be6
A25 Botvinnik Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4
A26 Closed System, King's English; A26 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3
A27 Three Knights System, English; A27 1.c4 e5 2.Nc3 Nc6 3.Nf3
A28 Four Knights Variation, English; A28 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6
A28 Korchnoi Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.a3
A28 Flexible Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d3
A28 Bradley Beach Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 e4
A28 Four Knights Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 exd4 5.Nxd4Bb4 6.Bg5 h6 7.Bh4 Bxc3+ 8.bxc3 Ne5
A28 Quiet Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3
A28 Romanishin Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 Bxc3
A28 Keene; Stean Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 O-O 6.Nd5 Re8 7.Qf5
A28 Botvinnik Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e4
A29 Fianchetto Line, Four Knights English; A29 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3
A30 Symmetrical Defense, English; A30 1.c4 c5
A30 Wing Variation, English 1.c4 c5 2.b4
A30 Napolitano Gambit, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.b4
A30 Hedgehog Variation, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7
A30 Double Fianchetto Defense, English 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O g6
A31 Anti-Benoni Variation, Symmetrical English; A31 1.c4 c5 2.Nf3 Nf6 3.d4
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