A31 Two Knights Variation, English 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4
A32 Spielmann Defense, Symmetrical English; A32 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6
A33 A33 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6
A33 Geller Variation, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.g3 Qb6
A34 Normal Variation, Symmetrical English; A34 1.c4 c5 2.Nc3
A34 Fianchetto Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.g3
A34 Rubinstein Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.g3 d5 4.cxd5 Nxd5 5.Bg2 Nc7
A34 Asymmetrical Variation, English 1.c4 c5 2.Nc3 Nf6 3.Nf3 d5 4.cxd5 Nxd5
A34 Keres-Parma System, English 1.c4 c5 2.Nc3 Nf6 3.Nf3 e6 4.g3 Nc6
A34 Four Knights Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.Nf3 Nf6
A35 Two Knights Variation, Symmetrical English; A35 1.c4 c5 2.Nc3 Nc6
A36 Fianchetto Variation, Symmetrical English; A36 1.c4 c5 2.Nc3 Nc6 3.g3
A36 Symmetrical Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7
A36 Botvinnik System Reversed, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 e5
A36 Botvinnik Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4
A37 Two Knights Line, Symmetrical English; A37 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3
A38 Full Symmetry Line, Symmetrical English; A38 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6
A38 Double Fianchetto, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.b3
A38 Duchamp Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d3
A39 Mecking Variation, Symmetrical English; A39 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4
A40 Hartlaub Gambit, English 1.c4 b6 2.d4 Bb7 3.Nc3 e6 4.e4 f5 5.exf5 Nf6
A40 Queen Pawn Opening; A40 1.d4
A40 St George's Gambit 1.d4 a6 2.c4 b5 3.e4 e6 4.cxb5 axb5
A40 Polish Defense 1.d4 b5
A40 Spassky Gambit, Polish Defense 1.d4 b5 2.e4 Bb7 3.Bxb5
A40 Queen Fianchetto, Queen Pawn Game 1.d4 b6
A40 Eastbourne Gambit 1.d4 b6 2.c4 Bb7 3.Bxb5
A40 Charlick Gambit; Englund Gambit 1.d4 e5
A40 Englund Gambit Declined 1.d4 e5 2.d5
A40 Diemer Counterattack 1.d4 e5 2.d5 Bc5 3.e4 Qh4
A40 Thuring Gambit; Hartlaub-Charlick Gambit 1.d4 e5 2.dxe5 d6
A40 Soller; Purchas Gambit 1.d4 e5 2.dxe5 f6
A40 Englund; Behting Gambit 1.d4 e5 2.dxe5 Nc6
A40 Felbecker Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Bc5
A40 Soller Gambit Deferred 1.d4 e5 2.dxe5 Nc6 3.Nf3 f6
A40 Zilbermints Gambit II, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 h6
A40 Zilbermints Gambit, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Nge7
A40 Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7
A40 Stockhom Variation, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7 4.Qd5
A40 Mosquito Gambit, Englund 1.d4 e5 2.dxe5 Qh4
A40 Horwitz Defense 1.d4 e6
A40 Franco-Indian Defense 1.d4 e6
A40 Seneschaud Variation, Dutch 1.d4 e6 2.Bf4 f5 3.g4
A40 English Defense 1.d4 e6 2.c4 b6
A40 Perrin Variation 1.d4 e6 2.c4 b6 3.e4 Bb7 4.Bd3 Nc6
A40 Poli Gambit 1.d4 e6 2.c4 b6 3.e4 Bb7 4.f3 f5 5.exf5 Nh6
A40 Hartlaub Gambit Declined 1.d4 e6 2.c4 b6 3.Nc3 Bb7 4.e4 f5 5.d5
A40 Hartlaub Gambit Accepted 1.d4 e6 2.c4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6
A40 Keres Defense, Indian; Kangaroo Defense 1.d4 e6 2.c4 Bb4+
A40 Transpositional Variation, Keres Defense 1.d4 e6 2.c4 Bb4+ 3.Nc3
A40 Zilbermints Gambit 1.d4 e6 2.c4 e5
A40 Borg Gambit 1.d4 g5
A40 Queen Pawn Fianchetto 1.d4 g6
A40 Kotov-Robatsch Defense 1.d4 g6 2.c4 Bg7
A40 Pseudo-Saemisch 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Be3 Nf6 5.f3
A40 Rossolimo Variation 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nf3 Bg4
A40 Neo-Modern Defense 1.d4 g6 2.c4 Bg7 3.e4 e5
A40 Beefeater Variation 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f5
A40 Modern Defense 1.d4 g6 2.c4 Bg7 3.Nc3 d6
A40 Kotov Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 Nc6
A40 Lizard Defense; Pirc-Diemer Gambit 1.d4 g6 2.h4 Nf6 3.h5
A40 Bogoljubov; Mikenas-Van Geet Defense 1.d4 Nc6
A40 Lundin Defense 1.d4 Nc6
A40 Lithuanian Variation, Mikenas 1.d4 Nc6 2.c4 e5 3.d5 Nce7
A40 Cannstatter Variation, Mikenas 1.d4 Nc6 2.c4 e5 3.d5 Nd4
A40 Pozarek Gambit 1.d4 Nc6 2.c4 e5 3.dxe5 Nxe5 4.Nc3 Nxc4
A40 Montevideo Defense 1.d4 Nc6 2.d5 Nb8
A40 Zaire Defense 1.d4 Nc6 2.d5 Nb8 3.e4 Nf6 5.e5 Ng8
A40 Polish Variation 1.e4 g6 2.d4 Bg7 3.c4 c5 4.Nf3 Qb6
A40 Dunworth Variation, Modern Defense 1.e4 g6 2.d4 Bg7 3.c4 d5 4.exd5 c6 5.dxc6 Bxd4
A41 Anglo-Slav Opening 1.d4 c6 2.c4 d6
A41 Pillsbury Defense; A41; Rat Defense 1.d4 d6
A41 Wade Defense 1.d4 d6 2.Nf3 Bg4
A41 Averbakh Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4
A41 Pterodactyl Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 c5 5.Nf3 Qa5
A42 A42 1.d4 d6 2.c4
A42 English Rat 1.d4 d6 2.c4 e5
A42 Lisbon Gambit 1.d4 d6 2.c4 e5 3.dxe5 Nc6
A42 Randspringer Variation 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 f5
A43 Staunton Defense; Benoni C-G; A43 1.d4 c5
A43 Zilbermints Gambit; Nakamura Gambit, Benoni 1.d4 c5 2.b4 cxb4
A43 Old Benoni 1.d4 c5 2.d5 d6
A43 Schmid Variation, Benoni 1.d4 c5 2.d5 d6 3.Nc3 g6
A43 Franco-Benoni; Franco-Sicilian 1.d4 c5 2.d5 e6 3.e4
A43 Clarendon Court Variation, Benoni 1.d4 c5 2.d5 f5
A43 Benoni-Staunton Gambit 1.d4 c5 2.d5 f5 3.e4
A43 Snail Variation, Benoni 1.d4 c5 2.d5 Na6
A43 Benoni-Indian Defense 1.d4 c5 2.d5 Nf6
A43 Woozle Defense, Benoni 1.d4 c5 2.d5 Nf6 3.Nc3 Qa5
A43 Kingside move order, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3
A43 Habichd; Hawk Variation, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3 c4
A43 Hawk Variation, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3 e4
A43 Benoni Gambit Accepted 1.d4 c5 2.dxc5
A43 Cormorant Gambit, Benoni 1.d4 c5 2.dxc5 b6
A43 Schlenker Defense, Benoni 1.d4 c5 2.dxc5 Na6
A43 Zilbermints-Benoni Gambit 1.d4 c5 2.Nf3 cxd4 3.b4
A43 Tamarkin Countergambit, Benoni 1.d4 c5 2.Nf3 cxd4 3.b4 e5
A43 Franco-Sicilian Hybrid 1.d4 e6 2.c4 c5 3.d5 exd5 4.cxd5 d6 5.Nc3 g6 6.e4 Bg7 7.Nf3 Ne7
A44 Pawn Thrust, Benoni; A44 1.d4 c5 2.d5 e5
A44 Blockade Variation; Semi-Benoni; Russian Variation 1.d4 c5 2.d5 e5 3.e4 d6
A45 Indian Defense; A45 1.d4 Nf6
A45 Basque Opening 1.d4 Nf6 2.b3
A45 Trompowsky; Opocensky; Ruth Opening 1.d4 Nf6 2.Bg5
A45 Poisoned Pawn Variation, Trompowsky 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3
A45 Chepukaitis Gambit 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3 Qxb2 5.Bd2 Qb6
A45 Borg Variation, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bf4 g5
A45 Edge Variation, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bh4
A45 Hergert Gambit #2, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 c6 4.Nd2 Qa5 5.c3 Nxd2 6.Qxd2 d5 7.e4
A45 Hergert Gambit #1, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 d5 4.f3 Nf6 5.Nc3 Bf5 6.e4
A45 Raptor Variation, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.h4
A45 Hergert Gambit, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.h4 Nxg5 4.hxg5 e5
A45 Pawn Push Variation 1.d4 Nf6 2.d5
A45 Omega Gambit 1.d4 Nf6 2.e4
A45 Arafat Gambit 1.d4 Nf6 2.e4 Nxe4 3.Bd3 Nf6 4.Bg5
A45 Paleface Attack 1.d4 Nf6 2.f3
A45 Webster Gambit 1.d4 Nf6 2.f3 c5 3.d5 e6 4.e4 exd5 5.e5
A45 Blackmar-Diemer Gambit Deferred 1.d4 Nf6 2.f3 d5 3.e4
A45 Kraus-Muhlherr Counter Gambit 1.d4 Nf6 2.f3 d5 3.e4 e5 4.dxe5 Nxe4
A45 Gedult Attack 1.d4 Nf6 2.f3 d5 3.g4
A45 Gedult-Gunderam System 1.d4 Nf6 2.f3 d5 3.g4
A45 Linder Counter Gambit 1.d4 Nf6 2.f3 e6 3.e4 Nxe4
A45 Canard Attack 1.d4 Nf6 2.f4
A45 Ueberlinger Gambit 1.d4 Nf6 2.g3 e5
A45 Bullfrog; Weidenhagen; Krabbe; Ochsenfrosch 1.d4 Nf6 2.g4
A45 Bronstein Gambit 1.d4 Nf6 2.g4
A45 Oshima Defense 1.d4 Nf6 2.g4 e5
A45 Gibbins-Wiedehagen Gambit Accepted 1.d4 Nf6 2.g4 Nxg4
A45 Stummer Gambit 1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3
A45 Maltese Falcon 1.d4 Nf6 2.g4 Nxg4 3.f3 Nf6 4.e4
A45 Reversed Chigorin Defense 1.d4 Nf6 2.Nc3 c5
A45 Von Beivorseen 1.d4 Nf6 2.Nc3 c5 3.dxc5
A45 Malich Gambit 1.d4 Nf6 2.Nc3 d5 3.Bg5 c5 4.Bxf6 gxf6 5.e4 dxe4 6.d5
A45 Huebsch Gambit 1.d4 Nf6 2.Nc3 d5 3.e4 Nxe4
A45 Maddigan Gambit 1.d4 Nf6 2.Nc3 e5
A45 Lazard Gambit; Maddigan Gambit 1.d4 Nf6 2.Nd2 e5
A46 Knights Variation, Indian Game; A46 1.d4 Nf6 2.Nf3
A46 Polish Defense 1.d4 Nf6 2.Nf3 b5
A46 Spielmann-Indian 1.d4 Nf6 2.Nf3 c5
A46 Pseudo-Benko Gambit 1.d4 Nf6 2.Nf3 c5 3.d5 b5
A46 Czech-Indian 1.d4 Nf6 2.Nf3 c6
A46 London System 1.d4 Nf6 2.Nf3 e6 3.Bf4
A46 Torre Attack 1.d4 Nf6 2.Nf3 e6 3.Bg5
A46 Petrosian Gambit 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e3 b6 5.d5
A46 Swiss; Wagner Gambit 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e4
A46 Nimzovich Variation, Torre Attack 1.d4 Nf6 2.Nf3 e6 3.Bg5 h6
A46 Yusupov-Rubinstein System 1.d4 Nf6 2.Nf3 e6 3.e3
A46 Dory Defense 1.d4 Nf6 2.Nf3 Ne4
A47 Capablanca Variation, Indian Game; A47 1.d4 Nf6 2.Nf3 b6
A47 Torre Attack 1.d4 Nf6 2.Nf3 b6 3.Bg5
A47 Schnepper Gambit 1.d4 Nf6 2.Nf3 b6 3.c3 e5
A47 Marienbad Variation 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5
A47 Berg Variation 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4
A48 Pseudo-King's Indian Variation; A48 1.d4 Nf6 2.Nf3 g6
A48 London System, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bf4
A48 London Variation 1.d4 Nf6 2.Nf3 g6 3.Bf4 Bg7 4.Nbd2
A48 Fianchetto Defense, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bg5
A48 Euwe Variation, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 c5
A48 King's Indian Variation 1.d4 Nf6 2.Nf3 g6 3.e3 Bg7 4.Bd3 d6
A49 Przepiorka Variation; A49 1.d4 Nf6 2.Nf3 g6 3.g3
A50 Normal Variation, Indian Game; A50 1.d4 Nf6 2.c4
A50 Pyrenees Gambit 1.d4 Nf6 2.c4 b5
A50 Queen's Indian Defense; Saemisch-Indian 1.d4 Nf6 2.c4 b6
A50 Medusa Gambit 1.d4 Nf6 2.c4 g5
A50 Van Geet; Kevitz; Trajkovic; Mexican 1.d4 Nf6 2.c4 Nc6
A50 Horsefly Gambit 1.d4 Nf6 2.c4 Nc6 3.d5 Ne5 4.f4
A32 Spielmann Defense, Symmetrical English; A32 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6
A33 A33 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6
A33 Geller Variation, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.g3 Qb6
A34 Normal Variation, Symmetrical English; A34 1.c4 c5 2.Nc3
A34 Fianchetto Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.g3
A34 Rubinstein Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.g3 d5 4.cxd5 Nxd5 5.Bg2 Nc7
A34 Asymmetrical Variation, English 1.c4 c5 2.Nc3 Nf6 3.Nf3 d5 4.cxd5 Nxd5
A34 Keres-Parma System, English 1.c4 c5 2.Nc3 Nf6 3.Nf3 e6 4.g3 Nc6
A34 Four Knights Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.Nf3 Nf6
A35 Two Knights Variation, Symmetrical English; A35 1.c4 c5 2.Nc3 Nc6
A36 Fianchetto Variation, Symmetrical English; A36 1.c4 c5 2.Nc3 Nc6 3.g3
A36 Symmetrical Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7
A36 Botvinnik System Reversed, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 e5
A36 Botvinnik Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4
A37 Two Knights Line, Symmetrical English; A37 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3
A38 Full Symmetry Line, Symmetrical English; A38 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6
A38 Double Fianchetto, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.b3
A38 Duchamp Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d3
A39 Mecking Variation, Symmetrical English; A39 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4
A40 Hartlaub Gambit, English 1.c4 b6 2.d4 Bb7 3.Nc3 e6 4.e4 f5 5.exf5 Nf6
A40 Queen Pawn Opening; A40 1.d4
A40 St George's Gambit 1.d4 a6 2.c4 b5 3.e4 e6 4.cxb5 axb5
A40 Polish Defense 1.d4 b5
A40 Spassky Gambit, Polish Defense 1.d4 b5 2.e4 Bb7 3.Bxb5
A40 Queen Fianchetto, Queen Pawn Game 1.d4 b6
A40 Eastbourne Gambit 1.d4 b6 2.c4 Bb7 3.Bxb5
A40 Charlick Gambit; Englund Gambit 1.d4 e5
A40 Englund Gambit Declined 1.d4 e5 2.d5
A40 Diemer Counterattack 1.d4 e5 2.d5 Bc5 3.e4 Qh4
A40 Thuring Gambit; Hartlaub-Charlick Gambit 1.d4 e5 2.dxe5 d6
A40 Soller; Purchas Gambit 1.d4 e5 2.dxe5 f6
A40 Englund; Behting Gambit 1.d4 e5 2.dxe5 Nc6
A40 Felbecker Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Bc5
A40 Soller Gambit Deferred 1.d4 e5 2.dxe5 Nc6 3.Nf3 f6
A40 Zilbermints Gambit II, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 h6
A40 Zilbermints Gambit, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Nge7
A40 Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7
A40 Stockhom Variation, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7 4.Qd5
A40 Mosquito Gambit, Englund 1.d4 e5 2.dxe5 Qh4
A40 Horwitz Defense 1.d4 e6
A40 Franco-Indian Defense 1.d4 e6
A40 Seneschaud Variation, Dutch 1.d4 e6 2.Bf4 f5 3.g4
A40 English Defense 1.d4 e6 2.c4 b6
A40 Perrin Variation 1.d4 e6 2.c4 b6 3.e4 Bb7 4.Bd3 Nc6
A40 Poli Gambit 1.d4 e6 2.c4 b6 3.e4 Bb7 4.f3 f5 5.exf5 Nh6
A40 Hartlaub Gambit Declined 1.d4 e6 2.c4 b6 3.Nc3 Bb7 4.e4 f5 5.d5
A40 Hartlaub Gambit Accepted 1.d4 e6 2.c4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6
A40 Keres Defense, Indian; Kangaroo Defense 1.d4 e6 2.c4 Bb4+
A40 Transpositional Variation, Keres Defense 1.d4 e6 2.c4 Bb4+ 3.Nc3
A40 Zilbermints Gambit 1.d4 e6 2.c4 e5
A40 Borg Gambit 1.d4 g5
A40 Queen Pawn Fianchetto 1.d4 g6
A40 Kotov-Robatsch Defense 1.d4 g6 2.c4 Bg7
A40 Pseudo-Saemisch 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Be3 Nf6 5.f3
A40 Rossolimo Variation 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nf3 Bg4
A40 Neo-Modern Defense 1.d4 g6 2.c4 Bg7 3.e4 e5
A40 Beefeater Variation 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f5
A40 Modern Defense 1.d4 g6 2.c4 Bg7 3.Nc3 d6
A40 Kotov Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 Nc6
A40 Lizard Defense; Pirc-Diemer Gambit 1.d4 g6 2.h4 Nf6 3.h5
A40 Bogoljubov; Mikenas-Van Geet Defense 1.d4 Nc6
A40 Lundin Defense 1.d4 Nc6
A40 Lithuanian Variation, Mikenas 1.d4 Nc6 2.c4 e5 3.d5 Nce7
A40 Cannstatter Variation, Mikenas 1.d4 Nc6 2.c4 e5 3.d5 Nd4
A40 Pozarek Gambit 1.d4 Nc6 2.c4 e5 3.dxe5 Nxe5 4.Nc3 Nxc4
A40 Montevideo Defense 1.d4 Nc6 2.d5 Nb8
A40 Zaire Defense 1.d4 Nc6 2.d5 Nb8 3.e4 Nf6 5.e5 Ng8
A40 Polish Variation 1.e4 g6 2.d4 Bg7 3.c4 c5 4.Nf3 Qb6
A40 Dunworth Variation, Modern Defense 1.e4 g6 2.d4 Bg7 3.c4 d5 4.exd5 c6 5.dxc6 Bxd4
A41 Anglo-Slav Opening 1.d4 c6 2.c4 d6
A41 Pillsbury Defense; A41; Rat Defense 1.d4 d6
A41 Wade Defense 1.d4 d6 2.Nf3 Bg4
A41 Averbakh Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4
A41 Pterodactyl Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 c5 5.Nf3 Qa5
A42 A42 1.d4 d6 2.c4
A42 English Rat 1.d4 d6 2.c4 e5
A42 Lisbon Gambit 1.d4 d6 2.c4 e5 3.dxe5 Nc6
A42 Randspringer Variation 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 f5
A43 Staunton Defense; Benoni C-G; A43 1.d4 c5
A43 Zilbermints Gambit; Nakamura Gambit, Benoni 1.d4 c5 2.b4 cxb4
A43 Old Benoni 1.d4 c5 2.d5 d6
A43 Schmid Variation, Benoni 1.d4 c5 2.d5 d6 3.Nc3 g6
A43 Franco-Benoni; Franco-Sicilian 1.d4 c5 2.d5 e6 3.e4
A43 Clarendon Court Variation, Benoni 1.d4 c5 2.d5 f5
A43 Benoni-Staunton Gambit 1.d4 c5 2.d5 f5 3.e4
A43 Snail Variation, Benoni 1.d4 c5 2.d5 Na6
A43 Benoni-Indian Defense 1.d4 c5 2.d5 Nf6
A43 Woozle Defense, Benoni 1.d4 c5 2.d5 Nf6 3.Nc3 Qa5
A43 Kingside move order, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3
A43 Habichd; Hawk Variation, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3 c4
A43 Hawk Variation, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3 e4
A43 Benoni Gambit Accepted 1.d4 c5 2.dxc5
A43 Cormorant Gambit, Benoni 1.d4 c5 2.dxc5 b6
A43 Schlenker Defense, Benoni 1.d4 c5 2.dxc5 Na6
A43 Zilbermints-Benoni Gambit 1.d4 c5 2.Nf3 cxd4 3.b4
A43 Tamarkin Countergambit, Benoni 1.d4 c5 2.Nf3 cxd4 3.b4 e5
A43 Franco-Sicilian Hybrid 1.d4 e6 2.c4 c5 3.d5 exd5 4.cxd5 d6 5.Nc3 g6 6.e4 Bg7 7.Nf3 Ne7
A44 Pawn Thrust, Benoni; A44 1.d4 c5 2.d5 e5
A44 Blockade Variation; Semi-Benoni; Russian Variation 1.d4 c5 2.d5 e5 3.e4 d6
A45 Indian Defense; A45 1.d4 Nf6
A45 Basque Opening 1.d4 Nf6 2.b3
A45 Trompowsky; Opocensky; Ruth Opening 1.d4 Nf6 2.Bg5
A45 Poisoned Pawn Variation, Trompowsky 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3
A45 Chepukaitis Gambit 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3 Qxb2 5.Bd2 Qb6
A45 Borg Variation, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bf4 g5
A45 Edge Variation, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bh4
A45 Hergert Gambit #2, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 c6 4.Nd2 Qa5 5.c3 Nxd2 6.Qxd2 d5 7.e4
A45 Hergert Gambit #1, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 d5 4.f3 Nf6 5.Nc3 Bf5 6.e4
A45 Raptor Variation, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.h4
A45 Hergert Gambit, Trompowsky 1.d4 Nf6 2.Bg5 Ne4 3.h4 Nxg5 4.hxg5 e5
A45 Pawn Push Variation 1.d4 Nf6 2.d5
A45 Omega Gambit 1.d4 Nf6 2.e4
A45 Arafat Gambit 1.d4 Nf6 2.e4 Nxe4 3.Bd3 Nf6 4.Bg5
A45 Paleface Attack 1.d4 Nf6 2.f3
A45 Webster Gambit 1.d4 Nf6 2.f3 c5 3.d5 e6 4.e4 exd5 5.e5
A45 Blackmar-Diemer Gambit Deferred 1.d4 Nf6 2.f3 d5 3.e4
A45 Kraus-Muhlherr Counter Gambit 1.d4 Nf6 2.f3 d5 3.e4 e5 4.dxe5 Nxe4
A45 Gedult Attack 1.d4 Nf6 2.f3 d5 3.g4
A45 Gedult-Gunderam System 1.d4 Nf6 2.f3 d5 3.g4
A45 Linder Counter Gambit 1.d4 Nf6 2.f3 e6 3.e4 Nxe4
A45 Canard Attack 1.d4 Nf6 2.f4
A45 Ueberlinger Gambit 1.d4 Nf6 2.g3 e5
A45 Bullfrog; Weidenhagen; Krabbe; Ochsenfrosch 1.d4 Nf6 2.g4
A45 Bronstein Gambit 1.d4 Nf6 2.g4
A45 Oshima Defense 1.d4 Nf6 2.g4 e5
A45 Gibbins-Wiedehagen Gambit Accepted 1.d4 Nf6 2.g4 Nxg4
A45 Stummer Gambit 1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3
A45 Maltese Falcon 1.d4 Nf6 2.g4 Nxg4 3.f3 Nf6 4.e4
A45 Reversed Chigorin Defense 1.d4 Nf6 2.Nc3 c5
A45 Malich Gambit 1.d4 Nf6 2.Nc3 d5 3.Bg5 c5 4.Bxf6 gxf6 5.e4 dxe4 6.d5
A45 Huebsch Gambit 1.d4 Nf6 2.Nc3 d5 3.e4 Nxe4
A45 Maddigan Gambit 1.d4 Nf6 2.Nc3 e5
A45 Lazard Gambit; Maddigan Gambit 1.d4 Nf6 2.Nd2 e5
A46 Knights Variation, Indian Game; A46 1.d4 Nf6 2.Nf3
A46 Polish Defense 1.d4 Nf6 2.Nf3 b5
A46 Spielmann-Indian 1.d4 Nf6 2.Nf3 c5
A46 Pseudo-Benko Gambit 1.d4 Nf6 2.Nf3 c5 3.d5 b5
A46 Czech-Indian 1.d4 Nf6 2.Nf3 c6
A46 London System 1.d4 Nf6 2.Nf3 e6 3.Bf4
A46 Torre Attack 1.d4 Nf6 2.Nf3 e6 3.Bg5
A46 Petrosian Gambit 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e3 b6 5.d5
A46 Swiss; Wagner Gambit 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e4
A46 Nimzovich Variation, Torre Attack 1.d4 Nf6 2.Nf3 e6 3.Bg5 h6
A46 Yusupov-Rubinstein System 1.d4 Nf6 2.Nf3 e6 3.e3
A46 Dory Defense 1.d4 Nf6 2.Nf3 Ne4
A47 Capablanca Variation, Indian Game; A47 1.d4 Nf6 2.Nf3 b6
A47 Torre Attack 1.d4 Nf6 2.Nf3 b6 3.Bg5
A47 Schnepper Gambit 1.d4 Nf6 2.Nf3 b6 3.c3 e5
A47 Marienbad Variation 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5
A47 Berg Variation 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4
A48 Pseudo-King's Indian Variation; A48 1.d4 Nf6 2.Nf3 g6
A48 London System, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bf4
A48 London Variation 1.d4 Nf6 2.Nf3 g6 3.Bf4 Bg7 4.Nbd2
A48 Fianchetto Defense, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bg5
A48 Euwe Variation, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 c5
A48 King's Indian Variation 1.d4 Nf6 2.Nf3 g6 3.e3 Bg7 4.Bd3 d6
A49 Przepiorka Variation; A49 1.d4 Nf6 2.Nf3 g6 3.g3
A50 Normal Variation, Indian Game; A50 1.d4 Nf6 2.c4
A50 Pyrenees Gambit 1.d4 Nf6 2.c4 b5
A50 Queen's Indian Defense; Saemisch-Indian 1.d4 Nf6 2.c4 b6
A50 Medusa Gambit 1.d4 Nf6 2.c4 g5
A50 Van Geet; Kevitz; Trajkovic; Mexican 1.d4 Nf6 2.c4 Nc6
A50 Horsefly Gambit 1.d4 Nf6 2.c4 Nc6 3.d5 Ne5 4.f4
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