| Name | ECO | Main line length |
| Four Knights Game | C47 | 6 plies |
| Four Knights Game: Glek System | C47 | 7 plies |
| Four Knights Game: Gunsberg Variation | C47 | 7 plies |
| Four Knights Game: Scotch Variation | C47 | 7 plies |
| Four Knights Game: Naroditsky Variation | C47 | 7 plies |
| Four Knights Game: Italian Variation | C47 | 7 plies |
| Four Knights Game: Spanish Variation | C48 | 7 plies |
| Four Knights Game: Halloween Gambit | C47 | 7 plies |
| Four Knights Game: Scotch Variation Accepted | C47 | 8 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation | C48 | 8 plies |
| Four Knights Game: Spanish Variation, Classical Variation | C48 | 8 plies |
| Four Knights Game: Spanish Variation, Double Spanish | C49 | 8 plies |
| Four Knights Game: Italian Variation | C50 | 8 plies |
| Four Knights Game: Gunsberg Variation, Provincial Opening | C47 | 9 plies |
| Four Knights Game: Scotch Variation, Krause Gambit | C47 | 9 plies |
| Four Knights Game: Scotch Variation, Belgrade Gambit | C47 | 9 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation, Henneberger Variation | C48 | 9 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation | C48 | 9 plies |
| Four Knights Game: Spanish Variation, Ranken Variation | C48 | 9 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation Accepted | C48 | 9 plies |
| Four Knights Game: Scotch Variation, Oxford Gambit | C47 | 10 plies |
| Four Knights Game: Italian Variation, Noa Gambit | C47 | 9 plies |
| Four Knights Game: Scotch Variation, Krause Gambit, Leonhardt Defense | C47 | 10 plies |
| Four Knights Game: Scotch Variation, Schmid Defense | C47 | 10 plies |
| Four Knights Game: Spanish Variation, Double Spanish | C49 | 11 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation | C48 | 11 plies |
| Four Knights Game: Spanish Variation, Nimzowitsch Variation | C49 | 11 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation | C49 | 12 plies |
| Four Knights Game: Scotch Variation, Belgrade Gambit, Modern Defense | C47 | 12 plies |
| Four Knights Game: Spanish Variation | C49 | 12 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Variation | C48 | 12 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Gambit | C48 | 12 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation | C49 | 13 plies |
| Four Knights Game: Glek System | C47 | 13 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation, Tarrasch Variation | C49 | 14 plies |
| Four Knights Game: Spanish Variation, Alatortsev Variation | C49 | 14 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation | C49 | 14 plies |
| Four Knights Game: Spanish Variation, Svenonius Variation | C49 | 14 plies |
| Four Knights Game: Spanish Variation, Gunsberg Counterattack | C49 | 14 plies |
| Four Knights Game: Spanish Variation, Janowski Variation | C49 | 15 plies |
| Four Knights Game: Halloween Gambit, Oldtimer Variation | C47 | 16 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation, Metger Unpin | C49 | 16 plies |
| Four Knights Game: Scotch Variation Accepted, Main Line | C47 | 17 plies |
| Four Knights Game: Spanish Variation, Bardeleben Variation | C48 | 18 plies |
| Four Knights Game: Spanish Variation, Rubinstein Variation, Maróczy Variation | C48 | 18 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation, Blake Variation | C49 | 20 plies |
| Four Knights Game: Spanish Variation, Symmetrical Variation | C49 | 20 plies |
| Four Knights Game: Spanish Variation, Spielmann Variation | C48 | 20 plies |
| Four Knights Game: Halloween Gambit, Plasma Variation | C47 | 22 plies |