| B07 | 150 Attack | 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.Qd2 | |
| A12 | A12 | 1.c4 c6 2.Nf3 d5 3.b3 | |
| A14 | A14 | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 | |
| A16 | A16 | 1.c4 Nf6 2.Nc3 | |
| A33 | A33 | 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 | |
| A42 | A42 | 1.d4 d6 2.c4 | |
| A59 | A59 | 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.e4 | |
| A61 | A61 | 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 | |
| A62 | A62 | 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 | |
| A63 | A63 | 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 a6 | |
| A64 | A64 | 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 a6 10.a4 Nbd7 11.Nd2 | |
| A68 | A68 | 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 | |
| A69 | A69 | 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.Be2 Re8 | |
| A71 | A71 | 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Bg5 | |
| A72 | A72 | 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 | |
| A73 | A73 | 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 | A74 | 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 | |
| A77 | A77 | 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 | A78 | 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 | A79 | 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 | |
| A84 | A84 | 1.d4 f5 2.c4 | |
| A85 | A85 | 1.d4 f5 2.c4 g6 3.Nc3 | |
| A87 | A87 | 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 | |
| A90 | A90 | 1.d4 f5 2.c4 Nf6 3.g3 e6 | |
| A91 | A91 | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 | |
| A92 | A92 | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 | |
| A94 | A94 | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.b3 c6 | |
| A95 | A95 | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.Nc3 | |
| A96 | A96 | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 | |
| A98 | A98 | 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 | A99 | 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 | Aachen Gambit, Nimzovich Defense | 1.e4 Nc6 2.d4 d5 3.exd5 Nb4 | |
| A00 | Aasum Gambit; Hector Gambit | 1.Nc3 d5 2.e4 dxe4 3.Bc4 | |
| C36 | Abbazia Defense, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 d5 4.exd5 Nf6 | |
| A06 | Abonyi Gambit; Tennison Gambit; Lemberg Gambit; Zukertort Gambit | 1.Nf3 d5 2.e4 | |
| A52 | Abonyi Variation, Budapest | 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 Nxe5 5.f4 Nec6 | |
| B20 | Abrahams Variation, Sicilian Wing Gambit | 1.e4 c5 2.b4 cxb4 3.Bb2 | |
| D31 | Abrahams; Noteboom; Klaus Junge Var, QGD | 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 a5 | |
| E70 | Accelerated Averbakh Variation, KID | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Bg5 | |
| B34 | Accelerated Dragon; Fianchetto Var; B34 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 | |
| D28 | Accelerated Fianchetto, QGA | 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 | |
| B06 | Accelerated Gurgenidze | 1.e4 g6 2.d4 Bg7 3.Nf3 d6 3.Nc3 c6 | |
| B27 | Accelerated Paulsen, Sicilian | 1.e4 c5 2.Nf3 Qc7 | |
| D81 | Accelerated Russian Variation, Grunfeld; D81 | 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Qb3 | |
| E24 | Accelerated Saemisch Variation, Nimzo-Indian | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 | |
| B41 | Accelerated Wimpy Variation, Sicilian | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 | |
| D45 | Acclerated Meran, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 a6 | |
| B27 | Action Extension, Sicilian | 1.e4 c5 2.Nf3 g6 3.c4 Bh6 | |
| C81 | Adam Variation, Ruy Lopez | 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 Be7 10.c4 | |
| B90 | Adams Attack, Sicilian | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.h3 | |
| B00 | Adams Defense | 1.e4 Nh6 | |
| C27 | Adams Gambit, Vienna | 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.d4 | |
| A52 | Adler Variation, Budapest | 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Nf3 | |
| D70 | Adjorjan Gambit | 1.d4 Nf6 2.c4 g6 3.d5 b5 | |
| A10 | Adorjan System, English | 1.c4 g6 2.e4 e5 | |
| D15 | Advance System, Slav | 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 c5 | |
| B12 | Advance Variation, Caro | 1.e4 c6 2.d4 d5 3.e5 | |
| C02 | Advance Variation, French; C02 | 1.e4 e6 2.d4 d5 3.e5 | |
| B29 | Advance Variation, Sicilian | 1.e4 c5 2.Nf3 Nf6 3.e5 | |
| D34 | Advance Variation, Tarrasch | 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5 c4 | |
| C02 | Advance; Nimzovich; Steinitz Var, Fr | 1.e4 e6 2.d4 d5 3.e5 Bd7 | |
| A13 | Agincourt Variation, English | 1.c4 e6 2.Nf3 d5 3.g3 | |
| A53 | Aged Gibbon Gambit | 1.d4 Nf6 2.c4 d6 3.g4 | |
| A13 | Agincourt; Kurajica Defense, English; A13 | 1.c4 e6 | |
| A00 | Akahi Variation | 1.e3 e5 2.Nc3 Nf6 3.f4 exf4 4.Nf3 | |
| C60 | Alapin Defense, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bb4 | |
| B20 | Alapin Formation, Smith-Morra Declined, Sicilian | 1.e4 c5 2.d4 cxd4 3.c3 Nf6 | |
| C60 | Alapin Gambit, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bb4 4.c3 Ba5 5.Bxc6 dxc6 | |
| C68 | Alapin Gambit, Ruy Lopez Exchange | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O Bg4 6.h3 h5 | |
| C20 | Alapin Opening | 1.e4 e5 2.Ne2 | |
| C14 | Alapin Variation, French | 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Nb5 | |
| D08 | Alapin Variation, QGD | 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.Nbd2 | |
| D31 | Alapin Variation, QGD | 1.d4 d5 2.c4 e6 3.Nc3 b6 | |
| C73 | Alapin Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6 6.d4 f6 | |
| D16 | Alapin Variation, Slav; D16 | 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 | |
| C25 | Alapin Variation, Vienna | 1.e4 e5 2.Nc3 Nc6 3.f4 | |
| B22 | Alapin; Sveshnikov Var, Sicilian; B22 | 1.e4 c5 2.c3 | |
| A80 | Alapin; Ulvestad; Manhattan; Kmoch Variation, Dutch | 1.d4 f5 2.Qd3 | |
| C00 | Alapin; Witaker Gambit, French | 1.e4 e6 2.d4 d5 3.Be3 | |
| C41 | Alapin-Blackburne Gambit, Philidor | 1.e4 e5 2.Nf3 d6 3.d4 Bg4 4.dxe5 Nd7 | |
| C00 | Alapin-Diemer Gambit, French | 1.e4 e6 2.d4 d5 3.Be3 dxe4 4.f3 | |
| C70 | Alapin's Defense Deferred, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Bb4 | |
| D44 | Alatortsev System, Semi-Slav | 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 Nd5 | |
| D31 | Alatortsev; Petrosian, Charousek Var, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Be7 | |
| D08 | Albin Countergambit; Cavalotti Var, QGD; D08 | 1.d4 d5 2.c4 e5 | |
| C53 | Albin Gambit, Italian | 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.O-O | |
| C14 | Albin-Chatard Gambit, French | 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 Bxg5 7.hxg5 Qxg5 | |
| D00 | Albrecht; Karlshruhle Defense, BDG | 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 g6 | |
| D00 | Alburt Defense, QP | 1.d4 d5 2.Nc3 Bf5 | |
| B04 | Alburt Variation, Alekhine | 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 g6 | |
| C15 | Alekhine (Maroczy) Variation, French | 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 | |
| D10 | Alekhine Attack, Slav | 1.d4 d5 2.c4 c6 3.Nc3 dxc4 4.e4 | |
| D06 | Alekhine Defense, QGD | 1.d4 d5 2.c4 g6 | |
| D51 | Alekhine Gambit, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.Nf3 h6 6.Bh4 dxc4 | |
| C45 | Alekhine Gambit, Scotch | 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.e5 | |
| B74 | Alekhine Line, Sicilian Dragon | 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 a5 | |
| D28 | Alekhine System, Classical Defense, QGA; D28 | 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 | |
| D20 | Alekhine System, QGA | 1.d4 d5 2.c4 dxc4 3.e4 Nf6 | |
| B05 | Alekhine Variation, Alekhine | 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 5.c4 | |
| E03 | Alekhine Variation, Catalan | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4 a6 7.Qc2 | |
| D06 | Alekhine Variation, Chigorin Defense | 1.d4 d5 2.c4 Nc6 3.Nf3 Bg4 4.Qa4 | |
| A92 | Alekhine Variation, Dutch | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O Ne4 | |
| D21 | Alekhine Variation, QGA | 1.d4 d5 2.c4 dxc4 3.Nf3 a6 | |
| D22 | Alekhine Variation, QGA | 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 Bg4 | |
| D67 | Alekhine Variation, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4 | |
| D51 | Alekhine Variation, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.Nf3 c6 6.e4 | |
| D38 | Alekhine Variation, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Bb4 5.Qa4 | |
| B70 | Alekhine Variation, Sicilian | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.O-O O-O 8.Nb3 | |
| D15 | Alekhine Variation, Slav | 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e3 | |
| D15 | Alekhine Variation, Slav | 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e3 b5 6.a4 b4 | |
| C27 | Alekhine Variation, Vienna | 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Be7 6.Nf3 Nc6 7.Nxe5 | |
| B02 | Alekhine's Defense; B02 | 1.e4 Nf6 | |
| C68 | Alekhjne Variation, Ruy Lopez Exchange | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 Bd6 | |
| B00 | Alekseev Variation, Nimzovich; Heinola-Deppe Gambit | 1.e4 Nc6 2.d4 d5 3.Nc3 e5 | |
| A00 | Alessi Gambit, Grob | 1.g4 f5 | |
| C53 | Alexandre Gambit, Italian | 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 f5 | |
| C39 | Allgaier; Cotter Cambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 | |
| B27 | Althouse; Stiletto Variation, Sicilian | 1.e4 c5 2.Nf3 Qa5 | |
| A00 | Alua Variation | 1.e3 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 | |
| A00 | Amar; Paris Opening | 1.Nh3 | |
| D00 | Amazon Attack | 1.d4 d5 2.Qd3 | |
| A00 | Amazon, Dunst | 1.Nc3 d5 2.e4 dxe4 3.Nxe4 Qd5 | |
| B45 | American Attack, Sicilian | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Nf6 6.Ndb5 Bb4 7.Nd6+ | |
| A82 | American Gambit, Dutch | 1.d4 f5 2.e4 fxe4 3.Nd2 | |
| A06 | Ampel Variation, Reti | 1.Nf3 d5 2.Rg1 | |
| B72 | Amsterdam (Battery) Variation, Sicilian | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.Qd2 | |
| A00 | Amsterdam Attack | 1.e3 e5 2.c4 d6 3.Nc3 Nc6 4.b3 Nf6 | |
| B93 | Amsterdam Variation, Sicilian; B93 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4 | |
| D12 | Amsterdam Variation, Slav | 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Nc3 | |
| C14 | Anderssen (Richter) Attack, French | 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.Bxf6 | |
| C37 | Anderssen Counter-Attack, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6 7.d4 d6 | |
| C33 | Anderssen Defense, KGA | 1.e4 e5 2.f4 exf4 3.Bc4 g5 | |
| C39 | Anderssen Defense, Kieseritsky Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 | |
| C25 | Anderssen Defense, Vienna | 1.e4 e5 2.Nc3 Bc5 | |
| C23 | Anderssen Gambit | 1.e4 e5 2.Bc4 b5 3.Bxb5 c6 | |
| B01 | Anderssen Variation, Center Counter | 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 e5 | |
| C51 | Anderssen Variation, Evans | 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Be7 | |
| C77 | Anderssen Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d3 | |
| C65 | Anderssen Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 d6 5.Bxc6+ | |
| B41 | Anderssen; Counterattack Var, Sic | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 | |
| C39 | Anderssen-Cordel Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.d4 Nh5 9.Bxf4 Nxf4 | |
| A00 | Anderssen's Opening | 1.a3 | |
| A00 | Andersspike | 1.a3 g6 2.g4 | |
| B20 | Andreaschek Gambit, Sicilian | 1.e4 c5 2.d4 cxd4 3.Nf3 e5 4.c3 | |
| A10 | Anglo Scandanavian Defense, English | 1.c4 d5 | |
| A15 | Anglo System, English; A15 | 1.c4 Nf6 | |
| A21 | Anglo-Dutch | 1.c4 e5 2.Nc3 f5 | |
| A10 | Anglo-Dutch Defense | 1.c4 f5 | |
| A10 | Anglo-Lithuanian Variation, English | 1.c4 Nc6 | |
| A10 | Anglo-Polish Dutch | 1.c4 f5 2.b4 | |
| A41 | Anglo-Slav Opening | 1.d4 c6 2.c4 d6 | |
| A11 | Anglo-Slav, English; A11 | 1.c4 c6 | |
| A16 | Anti-anti-grunfeld | 1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.e4 | |
| A31 | Anti-Benoni Variation, Symmetrical English; A31 | 1.c4 c5 2.Nf3 Nf6 3.d4 | |
| A80 | Anti-Classical Line, Dutch | 1.d4 f5 2.Qd3 e6 3.g4 | |
| B90 | Anti-English, Najdorf Sicilian | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 Ng4 | |
| D70 | Anti-Grunfeld Variation | 1.d4 Nf6 2.c4 g6 3.d5 | |
| A80 | Anti-Leningrad Variation, Dutch | 1.d4 f5 2.Qd3 g6 3.g4 | |
| C88 | Anti-Marshall Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.a4 | |
| D43 | Anti-Meran Gambit, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 | |
| B06 | Anti-Modern | 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Bc4 c6 5.Qe2 | |
| A80 | Anti-Modern, Dutch | 1.d4 f5 2.Qd3 d6 3.g4 | |
| D44 | Anti-Moscow Gambit | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 h6 6.Bh4 | |
| E10 | Anti-Nimzo-Indian; E10 | 1.d4 Nf6 2.c4 e6 3.Nf3 | |
| D30 | Anti-Noteboom Gambit, Semi-Slav | 1.d4 d5 2.c4 e6 3.Nf3 c6 4.Nc3 dxc4 5.g3 | |
| D31 | Anti-Noteboom Variation, Semi-Slav | 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 | |
| B07 | Anti-Philidor | 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.f4 | |
| A00 | Anti-Pirc Variation, Dunst; Myers Attack | 1.Nc3 g6 2.h4 | |
| E17 | Anti-Queen's Indian System | 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.Nc3 | |
| B57 | Anti-Sozin Variation, Sicilian | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4 Qb6 | |
| A80 | Anti-Stonewall, Dutch | 1.d4 f5 2.Qd3 d5 3.g4 | |
| D55 | Anti-Tartakower Variation, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bxf6 | |
| D02 | Anti-Torre | 1.d4 d5 2.Nf3 Bg4 3.Ne5 Bf5 4.g4 | |
| D02 | Anti-Torre, QP | 1.d4 d5 2.Nf3 Bg4 | |
| D00 | Anti-Veresov | 1.d4 d5 2.Nc3 Bg4 | |
| D10 | Anti-Winawer Gambit, Slav | 1.d4 d5 2.c4 c6 3.Nc3 e5 4.e4 | |
| A81 | Antoshin-Hort Variation, Dutch | 1.d4 f5 2.g3 Nf6 3.Bg2 d6 | |
| A45 | Arafat Gambit | 1.d4 Nf6 2.e4 Nxe4 3.Bd3 Nf6 4.Bg5 | |
| B98 | Argenitne; Goteborg Var, Sicilian | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 h6 9.Bh4 g5 | |
| A75 | Argentine Attack, Benoni; A75 | 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 | |
| D52 | Argentine Variation, QGD | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5 7.Nd2 Bb4 8.Qc2 O-O 9.Bh4 | |
| D31 | Argentinian Gambit, QGD | 1.d4 d5 2.c4 Bf5 3.cxd5 Bxb1 4.Qa4+ c6 5.dxc6 Nxc6 6.Rxb1 Qxd4 | |
| C78 | Arkangelsk; Counterthrust Var, Ruy | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 | |
| C18 | Armenian Line, French | 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Ba5 6.b4 cxd4 | |
| B28 | Aronin System, Sicilian | 1.e4 c5 2.Nf3 a6 3.Be2 | |
| E97 | Aronin-Taimanov Variation, KID; E97 | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 | |
| C95 | Arseniev Variation, Ruy Lopez | 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 Nbd7 11.c4 | |
| A34 | Asymmetrical Variation, English | 1.c4 c5 2.Nc3 Nf6 3.Nf3 d5 4.cxd5 Nxd5 | |
| B01 | Atkinson (Kloosterboer) Variation, Center Counter | 1.e4 d5 2.exd5 c6 3.dxc6 e5 | |
| C37 | Australian Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.h4 | |
| B09 | Austrian Attack, Pirc; B09 | 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 | |
| D06 | Austrian Defense; Summetrical Defense, QGD | 1.d4 d5 2.c4 c5 | |
| B09 | Austrian; Yugoslav Defense, Pirc | 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 | |
| E30 | Averbakh Gambit, Nimzo-Indian | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 b5 | |
| E73 | Averbakh Variation, KID | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 | |
| A41 | Averbakh Variation, Modern | 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 | |
| E14 | Averbakh Variation, QID | 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 | |
| C87 | Averbakh Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 d6 | |
| B03 | B03 | 1.e4 Nf6 2.e5 Nd5 3.d4 | |
| B04 | B04 | 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 | |
| B05 | B05 | 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 | |
| B07 | B07 | 1.e4 d6 | |
| B08 | B08 | 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 | |
| B11 | B11 | 1.e4 c6 2.Nc3 | |
| B12 | B12 | 1.e4 c6 2.d4 | |
| B14 | B14 | 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 | |
| B15 | B15 | 1.e4 c6 2.d4 d5 3.Nc3 | |
| B19 | B19 | 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 | |
| B25 | B25 | 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 | |
| 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 | |
| B31 | B31 | 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 | |
| B32 | B32 | 1.e4 c5 2.Nf3 Nc6 3.d4 | |
| B33 | B33 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 | |
| B35 | B35 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 | |
| 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 | |
| B41 | B41 | 1.e4 c5 2.Nf3 e6 3.d4 | |
| B42 | B42 | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 | |
| B43 | B43 | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3 | |
| B45 | B45 | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 | |
| B46 | B46 | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6 | |
| 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 | |
| B53 | B53 | 1.e4 c5 2.Nf3 d6 3.d4 | |
| B54 | B54 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 | |
| B55 | B55 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 | |
| B56 | B56 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 | |
| B58 | B58 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 | |
| B59 | B59 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 e5 7.Nb3 | |
| B61 | B61 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Qd2 | |
| B62 | B62 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 | |
| B64 | B64 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4 | |
| B65 | B65 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4 Nxd4 10.Qxd4 | |
| B66 | B66 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 | |
| B67 | B67 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7 | |
| B68 | B68 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7 9.f4 Be7 | |
| B69 | B69 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7 9.f4 Be7 10.Nf3 b5 11.Bxf6 | |
| B72 | B72 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 | |
| B73 | B73 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O | |
| B74 | B74 | 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 | B75 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 | |
| B77 | B77 | 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 | B78 | 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 | |
| B79 | B79 | 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 | |
| B85 | B85 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 a6 7.O-O Be7 | |
| B89 | B89 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 Nc6 7.Be3 | |
| B94 | B94 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 | |
| B95 | B95 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 | |
| B96 | B96 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 | |
| B98 | B98 | 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 | |
| B99 | B99 | 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 Nbd7 | |
| D17 | Baarn Variation, Slav; Bled Attack | 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Nh4 | |
| C01 | Baeuerle Gambit, French | 1.e4 e6 2.d4 b5 | |
| C37 | Baldwin Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Nc3 Qd4+ 8.Kh1 Qxc4 9.Nd5 | |
| C90 | Balla Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 | |
| A82 | Balogh Defense, Dutch | 1.d4 f5 2.e4 d6 | |
| B07 | Balogh Defense, Pirc | 1.e4 d6 2.d4 f5 | |
| B03 | Balogh Variation, Alekhine | 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Bc4 | |
| A52 | Balogh; Tartakower C-G, Budapest | 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 d6 | |
| D31 | Baltic Defense, QGD | 1.d4 d5 2.c4 Bf5 3.cxd5 Bxb1 4.Qa4+ c6 5.dxc6 Nxc6 | |
| C00 | Banzai-Leong Gambit, French | 1.e4 e6 2.b4 | |
| B28 | Barcza Line, Sicilian | 1.e4 c5 2.Nf3 a6 3.c3 Nf6 | |
| A07 | Barcza Opening, Reti; King's Indian Attack; A07 | 1.Nf3 d5 2.g3 | |
| A80 | Barcza Variation, Dutch | 1.d4 f5 2.Nf3 Nf6 3.c3 | |
| C44 | Bardeleben Variation, Scotch | 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Nxc3 Bb4 6.Bc4 Nf6 | |
| C29 | Bardeleben Variation, Vienna | 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Qf3 f5 | |
| C68 | Barendregt-Fischer Var, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O | |
| B22 | Barmen Defense, Sicilian | 1.e4 c5 2.c3 d5 3.exd5 Qxd5 | |
| A52 | Barmina Gambit, Budapest | 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 Nxe5 5.f4 Bc5 | |
| B00 | Barnes Defense | 1.e4 f6 | |
| A00 | Barnes; Gedult-Gunderam; Walkerling | 1.f3 | |
| C60 | Barnes; Smyslov; Fianchetto Var, Ruy | 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6 | |
| D02 | Barry Attack | 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.Be2 | |
| B00 | Basman Defense; Macho Grob | 1.e4 g5 | |
| C44 | Basman Gambit | 1.e4 e5 2.Nf3 Nc6 3.Be2 Nf6 4.d4 exd4 5.e5 | |
| A00 | Basman Gambit, Grob | 1.g4 d5 2.Bg2 h5 3.gxh5 | |
| C33 | Basman Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Qe2 | |
| A81 | Basman Variation, Dutch | 1.d4 f5 2.g3 g6 3.Bg2 Bg7 4.Nf3 c6 5.O-O Nh6 | |
| B00 | Basman; Macho Grob; Borg | 1.e4 g5 | |
| B50 | Basman-Palatnik Gambit | 1.e4 c5 2.Nf3 d6 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4 | |
| C84 | Basque Gambit, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.d4 exd4 7.e5 Ne4 8.c3 | |
| A45 | Basque Opening | 1.d4 Nf6 2.b3 | |
| B47 | Bastrikov Variation, Sicilian; B47 | 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 | |
| A02 | Batavo Polish Attack, Bird | 1.f4 Nf6 2.Nf3 g6 3.b4 | |
| A00 | Battambang, Dunst | 1.Nc3 e5 2.a3 | |
| C20 | Bavarian Gambit | 1.e4 e5 2.c4 d5 | |
| E97 | Bayonet Attack, KID | 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 | |
| B07 | Bayonet Attack, Pirc | 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2 Bg7 5.h4 | |
| B12 | Bayonet Variation, Caro | 1.e4 c6 2.d4 d5 3.e5 Bf5 4.g4 | |
| C77 | Bayreuth Variation, ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Bxc6 | |
| C34 | Becker; Anti-Kieseritzky Var, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 h6 | |
| A10 | Beefeater | 1.c4 g6 2.Nc3 Bg7 3.d4 c5 4.d5 Bxc3 5.bxc3 f5 | |
| A40 | Beefeater Variation | 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f5 | |
| D50 | Been & Koomen; Dutch & Peruvian | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 | |
| C47 | Belgrade Gambit, 4 Knights | 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nd5 | |
| E35 | Beliavsky Gambit, Nimzo-Indian | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 exd5 6.Nf3 Qf5 7.Qd1 e5 | |
| D31 | Beliavsky Line, Semi-Slav | 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 f6 | |
| C37 | Bello Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Nc3 | |
| A84 | Bellon Gambit | 1.d4 e6 2.c4 f5 3.e4 | |
| A84 | Bellon Gambit, Dutch | 1.d4 f5 2.c4 e6 3.e4 | |
| A22 | Bellon Gambit, English | 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 b5 | |
| C64 | Benelux Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Nf6 5.d4 Bb6 6.O-O O-O | |
| C44 | Benima Defense, Scotch | 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Be7 | |
| E62 | Benjamin Defense, KID | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c6 7.O-O Qb6 | |
| E99 | Benko Attack, KID; E99 | 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 | |
| A57 | Benko Gambit Accepted | 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 | |
| A57 | Benko Gambit Declined; Hjoerring Countergambit | 1.d4 Nf6 2.c4 c5 3.d5 b5 4.e4 | |
| A57 | Benko Gambit; Volga; Opocensky; Vaitonis; A57 | 1.d4 Nf6 2.c4 c5 3.d5 b5 | |
| E99 | Benko Variation, KID | 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 | |
| A00 | Benko; Barczay; Bilek; Hungarian | 1.g3 | |
| E74 | Benoni Defense, KID; E74 | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 c5 | |
| E31 | Benoni Defense, Nimzo-Indian; E31 | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 d6 | |
| A43 | Benoni Gambit Accepted | 1.d4 c5 2.dxc5 | |
| A09 | Benoni Reversed; Wing Blumenfeld; Advance Variation | 1.Nf3 d5 2.c4 d4 | |
| A43 | Benoni-Indian Defense | 1.d4 c5 2.d5 Nf6 | |
| A43 | Benoni-Staunton Gambit | 1.d4 c5 2.d5 f5 3.e4 | |
| A47 | Berg Variation | 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4 | |
| C63 | Berger (Dyckhoff) Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 | |
| C22 | Berger Variation, Center | 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Nf6 | |
| C42 | Berger Variation, Petroff | 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1 Bg4 9.c3 f5 10.Nbd2 | |
| C80 | Berger Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.a4 Nxd4 9.Nxd4 exd4 10.Nc3 | |
| C24 | Berlin Defense, Bishop; C24 | 1.e4 e5 2.Bc4 Nf6 | |
| C39 | Berlin Defense, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 | |
| C65 | Berlin Defense, Ruy Lopez; C65 | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 | |
| A00 | Berlin Gambit, Dunst | 1.Nc3 Nc6 2.d4 d5 3.e4 dxe4 4.d5 | |
| E38 | Berlin Variation, Nimzo-Indian; E38 | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 | |
| C82 | Berlin Variation, Ruy Lopez | 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 Nc5 | |
| C67 | Berlin; Rio de Janerio Var, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6+ bxc6 8.dxe5 Nb7 9.Nc3 O-O 10.Re1 | |
| C57 | Berliner Variation, 2 Knights | 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nd4 6.c3 b5 7.Bf1 Nxd5 8.Ne4 Qh4 | |
| E53 | Bernstein Defense; Gligoric System; E53 | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 | |
| C49 | Bernstein Variation, 4 Knights | 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Ne7 | |
| C12 | Bernstein Variation, French | 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bh4 | |
| E56 | Bernstein Variation, Nimzo-Indian; E56 | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 | |
| D57 | Bernstein Variation, QGD | 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 Nxc3 10.bxc3 | |
| C80 | Bernstein Variation, Ruy Lopez | 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 | |
| C35 | Bertin; Three Pawns Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Bh4+ 5.g3 | |
| D01 | Betbeder; Veresov; Levitzky; Parisian | 1.d4 d5 2.c4 dxc4 3.e4 f5 | |
| C65 | Beverwijk Variation, Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5 | |
| C21 | Beyer Gambit | 1.e4 e5 2.d4 d5 | |
| B20 | Big Clamp Variation, Sicilian | 1.e4 c5 2.d3 Nc6 3.c3 d6 4.f4 | |
| B00 | Bileefelder Gambit, Nimzovich Defense | 1.e4 Nc6 2.d4 e5 3.dxe5 Bc5 | |
| C40 | Bilguer Variation, Latvian | 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 | |
| C33 | Bilguer-Mirage Variation, KGA | 1.e4 e5 2.f4 exf4 3.Qe2 | |
| D20 | Billinger Gambit, QGA | 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bc4 exd4 5.Qb3 Qe7 6.a3 | |
| A00 | Billockus-Johansen Gambit, Dunst | 1.Nc3 e5 2.Nf3 Bc5 | |
| C54 | Bird Attack, Italian | 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.b4 | |
| C61 | Bird Defense, Ruy Lopez; C61 | 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4 | |
| C37 | Bird Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 Bg4 5.Ne5 Qh4+ 6.g3 | |
| C41 | Bird Gambit, Philidor | 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.c3 | |
| C00 | Bird Invitation, French | 1.e4 e6 2.Bb5 | |
| 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 | |
| A02 | Bird's Opening; Dutch Attack | 1.f4 | |
| A00 | Birmingham Gambit, Polish | 1.b4 c5 | |
| B06 | Bishop Attack | 1.e4 g6 2.d4 Bg7 3.Bc4 | |
| A57 | Bishop Attack, Benko Gambit | 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Bg5 | |
| E47 | Bishop Attack, Nimzo-Indian; E47 | 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 | |
| D30 | Bishop Attack, Tarrasch | 1.d4 d5 2.c4 e6 3.Nf3 c5 4.cxd5 exd5 5.Bg5 | |
| D00 | Bishop Attack; Levitsky Attack, Queen Pawn Game | 1.d4 d5 2.Bg5 | |
| D04 | Bishop Defense, QP; Anti-Colle | 1.d4 d5 2.Nf3 Nf6 3.e3 Bf5 | |
| C27 | Bishop Variation, Vienna | 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 | |
| C33 | Bishop's Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Bc4 | |
| C23 | Bishop's Opening; C23 | 1.e4 e5 2.Bc4 | |
| C37 | Blachy Gambit, KGA | 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Nc6 | |
| C31 | Blackbunre Attack, KGD | 1.e4 e5 2.f4 d5 3.Nf3 | |
| B01 | Blackbunre-Kloosterboer Gambit, Center Counter | 1.e4 d5 2.exd5 c6 3.dxc6 e5 | |
| C49 | Blackburne Attack, 4 Knights | 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.Nd5 Bc5 7.d4 | |
| A91 | Blackburne Attack, Dutch | 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Bg7 5.Nh3 | |
| C45 | Blackburne Attack, Scotch | 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Qd2 | |
| C10 | Blackburne Defense, French | 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 | |
| B01 | Blackburne Gambit, Center Counter | 1.e4 d5 2.exd5 c6 3.dxc6 Nxc6 | |
| A81 | Blackburne Variation, Dutch | 1.d4 f5 2.g3 Nf6 3.Bg2 e6 4.Nh3 | |
| D21 | Blackburne's Move, QGA; Normal Variation, QGA; D21 | 1.d4 d5 2.c4 dxc4 3.Nf3 | |
| D00 | Blackmar Gambit; Gedult Gambit |