B21 Tal Gambit, Sicilian 1.e4 c5 2.f4 d5 3.exd5 Nf6
B22 Alapin; Sveshnikov Var, Sicilian; B22 1.e4 c5 2.c3
B22 Barmen Defense, Sicilian 1.e4 c5 2.c3 d5 3.exd5 Qxd5
B22 Sherzer Variation, Sicilian 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.d4 e6 5.Nf3 Nc6
B22 Stoltz Attack, Sicilian 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.Nf3 Nc6 5.Bc4 Nb6 6.Bb3
B23 Closed; Chigorin Variation, Sicilian; B23 1.e4 c5 2.Nc3
B23 Grand Prix Variation, Sicilian 1.e4 c5 2.Nc3 d6 3.f4
B23 Marshall Gambit, Sicilian 1.e4 c5 2.Nc3 e6 3.d4 d5
B23 Korchnoi Defense, Sicilian 1.e4 c5 2.Nc3 e6 3.g3 d5
B23 Traditional Closed Sicilian 1.e4 c5 2.Nc3 Nc6
B23 Portland Attack, Sicilian 1.e4 c5 2.Nc3 Nc6 3.d3 g6 4.g4
B23 Vinken System, Sicilian; Grand Prix Attack 1.e4 c5 2.Nc3 Nc6 3.f4
B23 Schofman Variation, Sicilian 1.e4 c5 2.Nc3 Nc6 3.f4 g6 4.Nf3 Bg7 5.Bc4 e6 6.f5
B23 Chameleon Sicilian 1.e4 c5 2.Nc3 Nc6 3.Nge2
B24 Fianchetto Variation, Sicilian Closed; B24 1.e4 c5 2.Nc3 Nc6 3.g3
B25 B25 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6
B25 Botvinnik Defense, Sicilian Closed 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4 e5
B25 Edge Variation, Sicilian Closed 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4 e5 7.Nh3 Nge7
B26 B26 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Be3
B27 B27 1.e4 c5 2.Nf3
B27 Polish Gambit, Sicilian 1.e4 c5 2.Nf3 b5
B27 Katalimov Variation, Sicilian 1.e4 c5 2.Nf3 b6
B27 Jalalabad Variation, Sicilian 1.e4 c5 2.Nf3 e5
B27 Brussels Gambit, Sicilian 1.e4 c5 2.Nf3 f5
B27 Double-Dutch Gambit, Sicilian 1.e4 c5 2.Nf3 f5 3.exf5 Nh6
B27 Hyperaccelerated Dragon, Sicilian 1.e4 c5 2.Nf3 g6
B27 Action Extension, Sicilian 1.e4 c5 2.Nf3 g6 3.c4 Bh6
B27 Hyperaccelerated Pterodactyl, Sic 1.e4 c5 2.Nf3 g6 3.d4 Bg7
B27 Frederico Variation, Sicilian 1.e4 c5 2.Nf3 g6 3.d4 f5
B27 Sicilian Fred 1.e4 c5 2.Nf3 g6 3.d4 f5
B27 Buecker Variation, Sicilian 1.e4 c5 2.Nf3 h6
B27 Mongoose Variation, Sicilian 1.e4 c5 2.Nf3 Qa5
B27 Althouse; Stiletto Variation, Sicilian 1.e4 c5 2.Nf3 Qa5
B27 Accelerated Paulsen, Sicilian 1.e4 c5 2.Nf3 Qc7
B27 Quinteros Variation, Sicilian 1.e4 c5 2.Nf3 Qc7
B28 O'Kelly Variation, Sicilian; B28 1.e4 c5 2.Nf3 a6
B28 Kieseritzky System, Sicilian 1.e4 c5 2.Nf3 a6 3.b3
B28 Wing Gambit, Sicilian 1.e4 c5 2.Nf3 a6 3.b4
B28 Aronin System, Sicilian 1.e4 c5 2.Nf3 a6 3.Be2
B28 Venice System, Sicilian 1.e4 c5 2.Nf3 a6 3.c3
B28 Ljubojevic Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c3 b5
B28 Gambit Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.c3 d5 4.exd5 Nf6
B28 Steiner Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c3 d6
B28 Barcza Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c3 Nf6
B28 Maroczy Bind, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.c4
B28 Robatsch Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c4 d6
B28 Paulsen Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c4 e6
B28 Geller Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c4 Nc6 4.d4 cxd4 5.Nxd4 e5
B28 Quiet System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d3
B28 Normal System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4
B28 Cortlever Gambit, Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Bc4
B28 Smith-Morra Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.c3
B28 Taimanov Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4 e5
B28 Kan Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4 e6
B28 Zagorovsky Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Qxd4
B28 Reti System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.g3
B28 Yerevan System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.Nc3
B29 Nimzovich; Rubinstein Var, Sicilian; B29 1.e4 c5 2.Nf3 Nf6
B29 Advance Variation, Sicilian 1.e4 c5 2.Nf3 Nf6 3.e5
B30 Old Sicilian 1.e4 c5 2.Nf3 Nc6
B30 Rossolimo (Nezmetdinov) Variation, Sicilian; B30 1.e4 c5 2.Nf3 Nc6 3.Bb5
B31 B31 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6
B31 Gufeld Gambit, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 e5 6.d4
B31 Lutikov Gambit, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 Nf6 6.d4
B31 Gurgenidze Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.Re1 e5 6.b4
B31 San Francisco Gambit, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 Na5 4.b4
B32 B32 1.e4 c5 2.Nf3 Nc6 3.d4
B32 Nimzovich Variation, Sicilian; Nimzo-American Variation 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 d5
B32 Bourdonnais; Lowenthal Var, Sic 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5
B32 Kalashnikov Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6
B32 Retreat Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nf3
B32 Godiva Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qb6
B32 Flohr Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qc7
B33 B33 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6
B33 Four Knights Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3
B33 Lasker-Pelikan Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5
B33 Pelikan Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6
B33 Chelyabinsk Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5
B33 Sveshnikov Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 f5
B33 Bird Variation, Siclian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 Be6
B34 Accelerated Dragon; Fianchetto Var; B34 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6
B35 B35 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4
B36 Maroczy Bind, Sicilian; B36 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4
B36 Gurgenidze Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Nf6 6.Nc3 Nxd4 7.Qxd4 d6
B37 B37 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7
B38 B38 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3
B39 Breyer Variation, Sicilian; B39 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 Nf6 7.Nc3 Ng4
B40 French Variation, Sicilian; B40 1.e4 c5 2.Nf3 e6
B40 Wing Gambit Deferred, Sicilian 1.e4 c5 2.Nf3 e6 3.b4
B40 Kramnik Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.c4
B40 Gaw-Paw Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Qb6
B40 Kveinis Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Qb6
B41 B41 1.e4 c5 2.Nf3 e6 3.d4
B41 Accelerated Wimpy Variation, Sic 1.e4 c5 2.Nf3 e6 3.d4 cxd4
B41 Paulsen; Kan Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6
B41 Reti Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4
B41 Hedgehog Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 g6
B41 Bronstein Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 Nf6 6.Nc3 Bb4 7.Bd3 Nc6
B41 Anderssen; Counterattack Var, Sic 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6
B41 Pin Variation; Sicilian CounterAttack 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4
B41 Jaffe Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.Bd3 e5
B41 Koch Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.e5
B41 Marshall Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 d5
B42 B42 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3
B42 Polugaevsky Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Bc5
B42 Swiss Cheese Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 g6
B43 B43 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3
B44 Taimanov; Bastrikov, Paulsen Variation, Sicilian; B44 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6
B44 Szen Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5
B44 Gary Gambit, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.c4 Nf6 7.N1c3 a6 8.Na3 d5
B45 B45 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3
B45 Paulsen Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Nf6 6.Ndb5 Bb4
B45 American Attack, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Nf6 6.Ndb5 Bb4 7.Nd6+
B45 Four Knights Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6
B45 Cobra Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Ndb5 Bc5
B46 B46 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6
B46 Taimanov Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6 6.Be2 Nge7
B47 Bastrikov Variation, Sicilian; B47 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7
B47 Ponomariov Gambit, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Ndb5 Qb8 7.Be3 a6 8.Bb6
B48 B48 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3
B49 B49 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3 a6 7.Be2
B50 Modern Variation, Sicilian; B50 1.e4 c5 2.Nf3 d6
B50 Kopec System, Sicilian 1.e4 c5 2.Nf3 d6 3.Bd3
B50 Delayed Alapin, Sicilian 1.e4 c5 2.Nf3 d6 3.c3
B50 Basman-Palatnik Gambit 1.e4 c5 2.Nf3 d6 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4
B50 Kotov Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.g3 b5
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