| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 301. S Zoric vs M Diesen |
| ½-½ | 13 | 1979 | Virovitica | B95 Sicilian, Najdorf, 6...e6 |
| 302. M Diesen vs V Arapovic |
| ½-½ | 12 | 1979 | Virovitica | E68 King's Indian, Fianchetto, Classical Variation, 8.e4 |
| 303. V Kovacevic vs M Diesen |
 | 1-0 | 40 | 1979 | Virovitica | A46 Queen's Pawn Game |
| 304. M Diesen vs Ftacnik |
| ½-½ | 18 | 1979 | Virovitica | E14 Queen's Indian |
| 305. T Horvath vs M Diesen |
| ½-½ | 12 | 1979 | Virovitica | C47 Four Knights |
| 306. M Diesen vs V Zaltsman |
| ½-½ | 35 | 1980 | USA-ch+ | E59 Nimzo-Indian, 4.e3, Main line |
| 307. Evans vs M Diesen |
| ½-½ | 12 | 1980 | USA-ch+ | A34 English, Symmetrical |
| 308. M Diesen vs Shamkovich |
| 0-1 | 25 | 1980 | USA-ch+ | B56 Sicilian |
| 309. M Diesen vs G E Juarez Flores |
| 0-1 | 40 | 1980 | World Youth U26 Team Championship qual-4 | A95 Dutch, Stonewall |
| 310. J Athala vs M Diesen |
| 0-1 | 39 | 1980 | World Youth U26 Team Championship qual-4 | B20 Sicilian |
| 311. M Diesen vs R Filguth |
| ½-½ | 14 | 1980 | World Youth U26 Team Championship qual-4 | E12 Queen's Indian |
| 312. J Mestel vs M Diesen |
| 1-0 | 40 | 1980 | World Youth U26 Team Championship Final-A | B92 Sicilian, Najdorf, Opocensky Variation |
| 313. M Diesen vs R Filguth |
| 0-1 | 86 | 1980 | World Youth U26 Team Championship Final-A | E41 Nimzo-Indian |
| 314. M Diesen vs Dolmatov |
| 0-1 | 80 | 1980 | World Youth U26 Team Championship Final-A | D45 Queen's Gambit Declined Semi-Slav |
| 315. F Alvarez vs M Diesen |
| ½-½ | 14 | 1980 | World Youth U26 Team Championship Final-A | B16 Caro-Kann, Bronstein-Larsen Variation |
| 316. M Diesen vs A Zapata |
| 0-1 | 41 | 1980 | World Youth U26 Team Championship Final-A | E63 King's Indian, Fianchetto, Panno Variation |
| 317. S Giardelli vs M Diesen |
| 1-0 | 32 | 1980 | World Youth U26 Team Championship Final-A | A10 English |
| 318. D Tyomkin vs M Diesen |
| 1-0 | 74 | 2001 | WCN k.o. | D45 Queen's Gambit Declined Semi-Slav |
| 319. M Diesen vs D Tyomkin |
| 0-1 | 64 | 2001 | WCN k.o. | A70 Benoni, Classical with 7.Nf3 |
| 320. M Diesen vs D Tyomkin |
| ½-½ | 55 | 2001 | WCN k.o. | A15 English |
| 321. M Diesen vs D Tyomkin |
| ½-½ | 66 | 2001 | WCN k.o. | A70 Benoni, Classical with 7.Nf3 |
| 322. M Diesen vs C Schulien |
| 1-0 | 56 | 2002 | Internet | D45 Queen's Gambit Declined Semi-Slav |
| 323. K Hayward vs M Diesen |
| 0-1 | 20 | 2003 | Ch Texas | A46 Queen's Pawn Game |
Kibitzing
