O – Chess Openings by Name
| Opening Name | Chess Notation | MICOS Code | MICOS CAP |
|---|---|---|---|
| O'Kelly Defence | 1.e4 c5 2.Nf3 a6 | B01.099.SI | Explore ▶ |
| O'Kelly Defence | 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c6 | D04.033.BL | Explore ▶ |
| O'Kelly Defence: Aronin System | 1.e4 c5 2.Nf3 a6 3.Be2 | B01.102.SI | Explore ▶ |
| O'Kelly Defence: Kieseritzky System | 1.e4 c5 2.Nf3 a6 3.b3 | B01.100.SI | Explore ▶ |
| O'Kelly Defence: Maroczy Bind | 1.e4 c5 2.Nf3 a6 3.c4 | B01.108.SI | Explore ▶ |
| O'Kelly Defence: Maroczy Bind - Geller Defence | 1.e4 c5 2.Nf3 a6 3.c4 Nc6 4.d4 cxd4 5.Nxd4 e5 | B01.111.SI | Explore ▶ |
| O'Kelly Defence: Maroczy Bind - Paulsen Defence | 1.e4 c5 2.Nf3 a6 3.c4 e6 | B01.110.SI | Explore ▶ |
| O'Kelly Defence: Maroczy Bind - Robatsch Defence | 1.e4 c5 2.Nf3 a6 3.c4 d6 | B01.109.SI | Explore ▶ |
| O'Kelly Defence: Normal System | 1.e4 c5 2.Nf3 a6 3.d4 | B01.113.SI | Explore ▶ |
| O'Kelly Defence: Normal System - Cortlever Gambit | 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Bc4 | B01.114.SI | Explore ▶ |
| O'Kelly Defence: Normal System - Smith-Morra Attack | 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.c3 | B01.115.SI | Explore ▶ |
| O'Kelly Defence: Normal System - Taimanov Defence | 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4 e5 | B01.116.SI | Explore ▶ |
| O'Kelly Defence: Normal System - Zagorovsky Attack | 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Qxd4 | B01.117.SI | Explore ▶ |
| O'Kelly Defence: Quiet System | 1.e4 c5 2.Nf3 a6 3.d3 | B01.112.SI | Explore ▶ |
| O'Kelly Defence: Reti System | 1.e4 c5 2.Nf3 a6 3.g3 | B01.118.SI | Explore ▶ |
| O'Kelly Defence: Venice System | 1.e4 c5 2.Nf3 a6 3.c3 | B01.103.SI | Explore ▶ |
| O'Kelly Defence: Venice System - Barcza Defence | 1.e4 c5 2.Nf3 a6 3.c3 Nf6 | B01.107.SI | Explore ▶ |
| O'Kelly Defence: Venice System - Gambit Defence | 1.e4 c5 2.Nf3 a6 3.c3 d5 4.exd5 Nf6 | B01.105.SI | Explore ▶ |
| O'Kelly Defence: Venice System - Ljubojevic Defence | 1.e4 c5 2.Nf3 a6 3.c3 b5 | B01.104.SI | Explore ▶ |
| O'Kelly Defence: Venice System - Steiner Defence | 1.e4 c5 2.Nf3 a6 3.c3 d6 | B01.106.SI | Explore ▶ |
| O'Kelly Defence: Wing Gambit | 1.e4 c5 2.Nf3 a6 3.b4 | B01.101.SI | Explore ▶ |
| O'Kelly Defence: Yerevan System | 1.e4 c5 2.Nf3 a6 3.Nc3 | B01.119.SI | Explore ▶ |
| Old Attack | 1.d4 d5 2.c4 dxc4 3.e3 | D02.002.QA | Explore ▶ |
| Old Benoni Defence | 1.d4 c5 | E01.001.OB | Explore ▶ |
| Old Benoni Defence: 2…d6 | 1.d4 c5 2.d5 d6 | E01.006.OB | Explore ▶ |
| Old Benoni Defence: Advance Attack | 1.d4 c5 2.d5 | E01.005.OB | Explore ▶ |
| Old Billinger Gambit | 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.a3 | D02.003.QA | Explore ▶ |
| Old Christensen Gambit | 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Nf3 | D02.006.QA | Explore ▶ |
| Old Indian Attack | 1.Nf3 d5 2.d3 | A04.039.RE | Explore ▶ |
| Old Indian Defence | 1.d4 d6 2.c4 | E00.009.IQ | Explore ▶ |
| Old Indian Defence | 1.d4 Nf6 2.c4 d6 | E09.001.OI | Explore ▶ |
| Old Korchnoi Gambit | 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Kf1 | D02.004.QA | Explore ▶ |
| Old Novikov Gambit | 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Nd2 | D02.005.QA | Explore ▶ |
| Old Sicilian Defence | 1.e4 c5 2.Nf3 Nc6 | B01.341.SI | Explore ▶ |
| Omega Gambit | 1.d4 Nf6 2.e4 | E05.034.IN | Explore ▶ |
| Omega Gambit: Arafat Gambit | 1.d4 Nf6 2.e4 Nxe4 3.Bd3 Nf6 4.Bg5 | E05.035.IN | Explore ▶ |
| Omega Isis Gambit | 1.d4 f5 2.Nf3 e5 | E03.068.DU | Explore ▶ |
| Open Catalan | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 | E11.028.CA | Explore ▶ |
| Open Catalan: 5.Nf3 | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 | E11.029.CA | Explore ▶ |
| Open Catalan: 5.Qa4+ | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ | E11.032.CA | Explore ▶ |
| Open Catalan: 5…dxc4 | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 c6 5.Nf3 dxc4 | E11.027.CA | Explore ▶ |
| Open Catalan: 6.Qxc4 | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4 | E11.033.CA | Explore ▶ |
| Open Catalan: Alekhine Attack | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4 a6 7.Qc2 | E11.034.CA | Explore ▶ |
| Open Catalan: Classical Defence | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Be7 | E11.030.CA | Explore ▶ |
| Open Catalan: Modern Sharp Defence | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Nc6 6.Qa4 Bb4+ | E11.031.CA | Explore ▶ |
| Open Catalan: Tarrasch Defence | 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 c5 5.Nf3 Nc6 | E11.026.CA | Explore ▶ |
| Open Ruy Lopez | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 | C08.114.RL | Explore ▶ |
| Open Ruy Lopez Attack | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 | C08.115.RL | Explore ▶ |
| Open Ruy Lopez: 6...b5 | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 | C08.116.RL | Explore ▶ |
| Open Ruy Lopez: 7.Bb3 | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 | C08.117.RL | Explore ▶ |
| Open Ruy Lopez: 8.dxe5 | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 | C08.121.RL | Explore ▶ |
| Open Ruy Lopez: 8…Be6 | 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 | C08.122.RL | Explore ▶ |
| Open Ruy Lopez: 9.c3 | 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 | C08.123.RL | Explore ▶ |
| Open Ruy Lopez: Berger Attack | 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 | C08.119.RL | Explore ▶ |
| Open Ruy Lopez: Berlin 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 Nc5 | C08.134.RL | Explore ▶ |
| Open Ruy Lopez: Bernstein Attack | 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 | C08.135.RL | Explore ▶ |
| Open Ruy Lopez: Bernstein Luther Attack | 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 Bc5 10.Qe1 | C08.136.RL | Explore ▶ |
| Open Ruy Lopez: Breslau 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 Be7 10.Re1 O-O 11.Nd4 Nxe5 | C08.132.RL | Explore ▶ |
| Open Ruy Lopez: Classical Attack | 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 10.Re1 | C08.131.RL | Explore ▶ |
| Open Ruy Lopez: Classical 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 Be7 | C08.129.RL | Explore ▶ |
| Open Ruy Lopez: Dilworth 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 10.Nbd2 O-O 11.Bc2 Nxf2 | C08.126.RL | Explore ▶ |
| Open Ruy Lopez: Friess Attack | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Nxe5 | C08.143.RL | Explore ▶ |
| Open Ruy Lopez: Harksen Gambit | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.c4 | C08.120.RL | Explore ▶ |
| Open Ruy Lopez: Howell Attack | 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 | C08.138.RL | Explore ▶ |
| Open Ruy Lopez: Howell Attack Adam | 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 | C08.139.RL | Explore ▶ |
| Open Ruy Lopez: Howell Attack Ekstroem | 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.Rd1 O-O 11.c4 bxc4 12.Bxc4 Qd7 | C08.140.RL | Explore ▶ |
| 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 | C08.124.RL | Explore ▶ |
| Open Ruy Lopez: Karpov Gambit | 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 Nc5 10.c3 d4 11.Ng5 | C08.137.RL | Explore ▶ |
| Open Ruy Lopez: Knorre Attack | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.Nc3 | C08.145.RL | Explore ▶ |
| Open Ruy Lopez: Malkin Attack | 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 10.Nbd2 O-O 11.Qe2 | C08.130.RL | Explore ▶ |
| Open Ruy Lopez: Morphy's Defence - Tartakower Attack | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.Qe2 | C08.146.RL | Explore ▶ |
| Open Ruy Lopez: Motzko Attack | 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 10.Qd3 | C08.127.RL | Explore ▶ |
| Open Ruy Lopez: Motzko Attack - Nenarokov 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 10.Qd3 Ne7 | C08.128.RL | Explore ▶ |
| Open Ruy Lopez: Richter Attack | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.d5 | C08.142.RL | Explore ▶ |
| Open Ruy Lopez: Riga Defence | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 exd4 | C08.144.RL | Explore ▶ |
| Open Ruy Lopez: Schlechter Defence | 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 | C08.118.RL | Explore ▶ |
| Open Ruy Lopez: Skipworth Gambit | 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.Re1 d5 | C08.147.RL | Explore ▶ |
| Open Ruy Lopez: St. Petersburg Attack | 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 10.Nbd2 | C08.125.RL | Explore ▶ |
| Open Ruy Lopez: Tarrasch Trap | 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 10.Re1 O-O 11.Nd4 Qd7 12.Nxe6 fxe6 13.Rxe4 | C08.133.RL | Explore ▶ |
| Open Ruy Lopez: Zukertort 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 Ne7 | C08.141.RL | Explore ▶ |
| Open Sicilian | 1.e4 c5 2.Nf3 Nc6 3.d4 | B01.351.SI | Explore ▶ |
| Open Sicilian: 3…cxd4 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 | B01.352.SI | Explore ▶ |
| Open Sicilian: 4.Nxd4 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 | B01.353.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 | B01.357.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Exchange Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nxc6 | B01.366.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Maroczy Bind | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 | B01.358.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Maroczy Bind - Breyer Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 Nf6 7.Nc3 Ng4 | B01.361.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Maroczy Bind - Gurgenidze Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Nf6 6.Nc3 Nxd4 7.Qxd4 d6 | B01.363.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Maroczy Bind: 5...Bg7 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 | B01.359.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Maroczy Bind: 6.Be3 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 | B01.360.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Modern Attack | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 | B01.364.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Modern Attack: 7.Bc4 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 | B01.365.SI | Explore ▶ |
| Open Sicilian: Accelerated Dragon Defence - Simagin Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Nc2 d6 7.Be2 Nh6 | B01.362.SI | Explore ▶ |
| Open Sicilian: Bird's Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 Be6 | B01.375.SI | Explore ▶ |
| Open Sicilian: Exchange | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nxc6 | B01.377.SI | Explore ▶ |
| Open Sicilian: Flohr Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qc7 | B01.379.SI | Explore ▶ |
| Open Sicilian: Franco Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 e6 | B01.380.SI | Explore ▶ |
| Open Sicilian: Godiva Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qb6 | B01.378.SI | Explore ▶ |
| Open Sicilian: Kalashnikov Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6 | B01.356.SI | Explore ▶ |
| Open Sicilian: Loewenthal Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 | B01.355.SI | Explore ▶ |
| Open Sicilian: Nimzo-American Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 d5 | B01.354.SI | Explore ▶ |
| Open Sicilian: Old Sicilian Defence: 4…Nf6 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 | B01.367.SI | Explore ▶ |
| Open Sicilian: Retreat | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nf3 | B01.376.SI | Explore ▶ |
| Open Sicilian: Schlechter Attack | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nb3 | B01.369.SI | Explore ▶ |
| Open Sicilian: Sveshnikov Defence | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 | B01.368.SI | Explore ▶ |
| Open Sicilian: Sveshnikov Defence: 10…f5 | 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 | B01.372.SI | Explore ▶ |
| Open Sicilian: Sveshnikov Defence: 8…b5 | 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 | B01.370.SI | Explore ▶ |
| Open Sicilian: Sveshnikov Defence: Chelyabinsk Attack | 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.Nd5 | B01.374.SI | Explore ▶ |
| Open Sicilian: Sveshnikov Defence: Novosibirsk Defence | 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 Bg7 | B01.371.SI | Explore ▶ |
| Open Sicilian: Sveshnikov Defence: Peresypkin's Sacrifice | 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 11.Bxb5 | B01.373.SI | Explore ▶ |
| Opocensky Attack | 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd2 | E16.045.GR | Explore ▶ |
| Orsini Gambit | 1.e4 e5 2.f4 exf4 3.b3 | C04.002.KA | Explore ▶ |
| Orthodox Attack | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 | E15.070.KI | Explore ▶ |
| Orthodox Attack: 6.Nf3 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 | D01.053.QD | Explore ▶ |
| Orthodox Attack: Exchange Attack | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.dxe5 | E15.097.KI | Explore ▶ |
| Orthodox Attack: Gligoric-Taimanov System | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.Be3 | E15.092.KI | Explore ▶ |
| Orthodox Attack: Kazakh Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 Na6 | E15.098.KI | Explore ▶ |
| Orthodox Attack: Petrosian Attack | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 | E15.093.KI | Explore ▶ |
| Orthodox Attack: Petrosian Attack - Keres Attack | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 Nbd7 8.Bg5 h6 9.Bh4 g5 10.Bg3 Nh5 11.h4 | E15.096.KI | Explore ▶ |
| Orthodox Attack: Petrosian Attack - Normal Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 Nbd7 | E15.095.KI | Explore ▶ |
| Orthodox Attack: Petrosian Attack - Stein Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 a5 | E15.094.KI | Explore ▶ |
| Orthodox Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 | D01.070.QD | Explore ▶ |
| Orthodox Defence: 11.O-O | 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.O-O | D01.085.QD | Explore ▶ |
| Orthodox Defence: 6.Rc1 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Rc1 | D01.097.QD | Explore ▶ |
| Orthodox Defence: 6…e5 | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 | E15.071.KI | Explore ▶ |
| Orthodox Defence: 6…h6 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 | D01.055.QD | Explore ▶ |
| Orthodox Defence: 7.Bh4 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 | D01.056.QD | Explore ▶ |
| Orthodox Defence: 7.Rc1 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 | D01.075.QD | Explore ▶ |
| Orthodox Defence: 7…c6 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 | D01.080.QD | Explore ▶ |
| Orthodox Defence: 8.Bd3 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 | D01.081.QD | Explore ▶ |
| Orthodox Defence: Alekhine Attack | 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 | D01.090.QD | Explore ▶ |
| Orthodox Defence: Anti-Tartakower Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bxf6 | D01.068.QD | Explore ▶ |
| Orthodox Defence: Anti-Tartakower Attack - Petrosian Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bxf6 Bxf6 8.Rc1 c6 9.Bd3 Nd7 10.O-O dxc4 11.Bxc4 | D01.069.QD | Explore ▶ |
| Orthodox Defence: Been-Koomen Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 | D01.101.QD | Explore ▶ |
| Orthodox Defence: Botvinnik Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Bd3 | D01.071.QD | Explore ▶ |
| Orthodox Defence: Capablanca Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 b6 8.cxd5 exd5 9.Bb5 | D01.078.QD | Explore ▶ |
| Orthodox Defence: Capablanca Freeing Manoevre | 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 | D01.084.QD | Explore ▶ |
| Orthodox Defence: Capablanca System | 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 | D01.083.QD | Explore ▶ |
| Orthodox Defence: Classical Defence | 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.O-O Nxc3 12.Rxc3 e5 | D01.086.QD | Explore ▶ |
| Orthodox Defence: Classical Defence: 14…Qxe5 | 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.O-O Nxc3 12.Rxc3 e5 13.dxe5 Nxe5 14.Nxe5 Qxe5 | D01.087.QD | Explore ▶ |
| Orthodox Defence: Classical Maroczy Attack | 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.O-O Nxc3 12.Rxc3 e5 13.Qb1 | D01.088.QD | Explore ▶ |
| Orthodox Defence: Classical Vidmar Attack | 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.O-O Nxc3 12.Rxc3 e5 13.Qc2 | D01.089.QD | Explore ▶ |
| Orthodox Defence: Fianchetto | 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 b5 | D01.082.QD | Explore ▶ |
| Orthodox Defence: Janowski Attack | 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.h4 | D01.091.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Ne4 | D01.098.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence - Bernstein Defence | 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 exd5 11.Qb3 Qd6 | D01.064.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence - Bernstein Mar del Plata Gambit | 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 exd5 11.Qb3 Rd8 12.c4 Be6 | D01.065.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence - Russian Defence | 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.Qc2 Nf6 10.Bd3 dxc4 11.Bxc4 c5 12.O-O Nc6 13.Rfd1 Bd7 | D01.067.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence - Teichmann Attack | 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.Qc2 | D01.066.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence: 10.bxc3 | 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 | D01.063.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence: 7…Ne4 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4 | D01.061.QD | Explore ▶ |
| Orthodox Defence: Lasker Defence: 8…Qxe7 | 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 | D01.062.QD | Explore ▶ |
| Orthodox Defence: Miles Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.Nf3 O-O 6.Qc2 | D01.099.QD | Explore ▶ |
| Orthodox Defence: Pillsbury Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 b6 8.cxd5 exd5 9.Bd3 | D01.079.QD | Explore ▶ |
| Orthodox Defence: Pseudo-Tarrasch Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5 | D01.102.QD | Explore ▶ |
| Orthodox Defence: Pseudo-Tarrasch Attack - Canal Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5 Qb6 | D01.103.QD | Explore ▶ |
| Orthodox Defence: Pseudo-Tarrasch Attack - Primitive Pillsbury Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Nxd4 e5 7.Ndb5 a6 8.Qa4 | D01.104.QD | Explore ▶ |
| Orthodox Defence: Rauzer Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qb3 | D01.072.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qc2 | D01.073.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Attack - Grunfeld Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 a6 9.a3 | D01.094.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Attack - Karlsbad Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 a6 | D01.093.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Attack - Wolf Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 Ne4 | D01.096.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Attack: 8.Qc2 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 | D01.092.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Attack: 9.cxd5 | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 a6 9.cxd5 | D01.095.QD | Explore ▶ |
| Orthodox Defence: Rubinstein Flohr Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qc2 c5 8.cxd5 | D01.074.QD | Explore ▶ |
| Orthodox Defence: Semi-Tarrasch - Krause Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Qxd4 | D01.105.QD | Explore ▶ |
| Orthodox Defence: Swiss - Henneberger Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 a6 | D01.076.QD | Explore ▶ |
| Orthodox Defence: Swiss - Karlsbad Attack | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 a6 8.cxd5 | D01.077.QD | Explore ▶ |
| Orthodox Defence: Tartakower Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6 | D01.057.QD | Explore ▶ |
| Orthodox Defence: Tartakower Defence - Exchange Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6 8.cxd5 exd5 | D01.058.QD | Explore ▶ |
| Orthodox Defence: Tartakower Defence - Makogonov Exchange Defence | 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 | D01.059.QD | Explore ▶ |
| Orthodox Defence: Tartakower Defence: 11…Be6 | 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 9.Bxe7 Qxe7 10.Nxd5 exd5 11.Rc1 Be6 | D01.060.QD | Explore ▶ |
| Orthodox Defence: Uhlmann Defence | 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.Nf3 h6 6.Bh4 O-O 7.Rc1 dxc4 | D01.100.QD | Explore ▶ |
| Orthodox Opening | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O | E15.072.KI | Explore ▶ |
| Orthodox Opening: Active Attack: 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 | E15.078.KI | Explore ▶ |
| Orthodox Opening: Aronin-Taimanov Attack | 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 | E15.089.KI | Explore ▶ |
| Orthodox Opening: Aronin-Taimanov Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 | E15.080.KI | Explore ▶ |
| Orthodox Opening: Bayonet Attack | 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 | E15.081.KI | Explore ▶ |
| Orthodox Opening: Bayonet Attack - Sokolov's Attack | 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 Nh5 10.Re1 | E15.083.KI | Explore ▶ |
| Orthodox Opening: Bayonet Attack - Yepishin's Attack | 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 Nh5 10.Qc2 | E15.082.KI | Explore ▶ |
| Orthodox Opening: Classical Attack System | 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 | E15.086.KI | Explore ▶ |
| Orthodox Opening: Classical System - Benko Attack | 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 | E15.091.KI | Explore ▶ |
| Orthodox Opening: Classical System - Kozul Gambit | 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.Be3 f5 11.f3 f4 12.Bf2 g5 13.Rc1 Ng6 14.c5 | E15.088.KI | Explore ▶ |
| Orthodox Opening: Classical System - Neo Grunfeld Defence | 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.Be3 | E15.087.KI | Explore ▶ |
| Orthodox Opening: Classical System - Traditional Defence | 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 | E15.090.KI | Explore ▶ |
| Orthodox Opening: Donner Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O c6 | E15.074.KI | Explore ▶ |
| Orthodox Opening: Glek Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Na6 | E15.075.KI | Explore ▶ |
| Orthodox Opening: Korchnoi Attack | 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.Bd2 | E15.084.KI | Explore ▶ |
| Orthodox Opening: Modern System | 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.Nd2 | E15.085.KI | Explore ▶ |
| Orthodox Opening: Positional Defence - Closed Attack | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nbd7 8.d5 | E15.077.KI | Explore ▶ |
| Orthodox Opening: Positional Defence: 7…Nbd7 | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nbd7 | E15.076.KI | Explore ▶ |
| Orthodox Opening: Positional Defence: 9…a5 | 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 | E15.079.KI | Explore ▶ |
| Orthodox Opening: Ukrainian Defence | 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O a5 | E15.073.KI | Explore ▶ |
| Orthoschnapp Gambit | 1.e4 e6 2.c4 d5 3.cxd5 exd5 4.Qb3 | B05.008.FR | Explore ▶ |
| O'Sullivan Gambit | 1.e4 Nf6 2.e5 Nd5 3.d4 b5 | B09.018.AL | Explore ▶ |
| Owen's Defence | 1.e4 b6 | B00.010.IK | Explore ▶ |
| Owen's Defence: Guatemala Defence | 1.e4 b6 2.d4 Ba6 | B00.011.IK | Explore ▶ |
| Owen's Defence: Hekili-Loa Gambit | 1.e4 b6 2.d4 c5 3.dxc5 Nc6 | B00.017.IK | Explore ▶ |
| Owen's Defence: Matovinsky Gambit | 1.e4 b6 2.d4 Bb7 3.Bd3 f5 | B00.012.IK | Explore ▶ |
| Owen's Defence: Matovinsky Gambit: 5…g6 | 1.e4 b6 2.d4 Bb7 3.Bd3 f5 4.exf5 Bxg2 5.Qh5+ g6 | B00.013.IK | Explore ▶ |
| Owen's Defence: Naselwaus Gambit | 1.e4 b6 2.d4 Bb7 3.Bg5 | B00.014.IK | Explore ▶ |
| Owen's Defence: Smith Gambit | 1.e4 b6 2.d4 Bb7 3.Nf3 | B00.016.IK | Explore ▶ |
| Owen's Defence: Wind Gambit | 1.e4 b6 2.d4 Bb7 3.f3 e5 | B00.015.IK | Explore ▶ |
| Ozol Attack | 1.d4 f5 2.c4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Bg5 | E03.040.DU | Explore ▶ |
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