| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 276. M Diesen vs B Rogulj |
| 1-0 | 42 | 1979 | Karlovac | B04 Alekhine's Defense, Modern |
| 277. B Kurajica vs M Diesen |
| 1-0 | 40 | 1979 | Karlovac | C16 French, Winawer |
| 278. M Diesen vs D Brkic |
| 1-0 | 42 | 1979 | Karlovac | E12 Queen's Indian |
| 279. J Bellon Lopez vs M Diesen |
| ½-½ | 41 | 1979 | Karlovac | B56 Sicilian |
| 280. M Diesen vs S Tatai |
| ½-½ | 16 | 1979 | Karlovac | E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3 |
| 281. Balashov vs M Diesen |
| 1-0 | 44 | 1979 | Karlovac | B09 Pirc, Austrian Attack |
| 282. M Diesen vs V Kovacevic |
| ½-½ | 13 | 1979 | Karlovac | E20 Nimzo-Indian |
| 283. O Rodriguez Vargas vs M Diesen |
| ½-½ | 10 | 1979 | Karlovac | E15 Queen's Indian |
| 284. M Diesen vs I Nemet |
| ½-½ | 13 | 1979 | Karlovac | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 285. M Diesen vs Daniel Brownstein |
| 1-0 | 22 | 1979 | 80th US Open | A18 English, Mikenas-Carls |
| 286. Kenneth Walter vs M Diesen |
| 0-1 | 25 | 1979 | 80th US Open | B22 Sicilian, Alapin |
| 287. M Diesen vs K Holzmueller |
| 1-0 | 44 | 1979 | 80th US Open | A28 English |
| 288. L Lipking vs M Diesen |
| 0-1 | 47 | 1979 | 80th US Open | B09 Pirc, Austrian Attack |
| 289. M Diesen vs V Pupols |
| 1-0 | 58 | 1979 | 80th US Open | D43 Queen's Gambit Declined Semi-Slav |
| 290. R Pelts vs M Diesen |
| ½-½ | 16 | 1979 | 80th US Open | A14 English |
| 291. M Diesen vs Gheorghiu |
| 0-1 | 49 | 1979 | 80th US Open | A56 Benoni Defense |
| 292. M Diesen vs F La Rota |
| 1-0 | 38 | 1979 | 80th US Open | A13 English |
| 293. J Bradford vs M Diesen |
| 0-1 | 50 | 1979 | 80th US Open | E69 King's Indian, Fianchetto, Classical Main line |
| 294. M Diesen vs A Bisguier |
| ½-½ | 9 | 1979 | 80th US Open | D31 Queen's Gambit Declined |
| 295. Alburt vs M Diesen |
| ½-½ | 24 | 1979 | 80th US Open | E19 Queen's Indian, Old Main line, 9.Qxc3 |
| 296. Z Klaric vs M Diesen |
| 1-0 | 45 | 1979 | Virovitica | A48 King's Indian |
| 297. M Diesen vs J Rukavina |
| ½-½ | 12 | 1979 | Virovitica | B06 Robatsch |
| 298. D Minic vs M Diesen |
| ½-½ | 15 | 1979 | Virovitica | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 299. M Diesen vs A Paidousis |
| ½-½ | 43 | 1979 | Virovitica | E12 Queen's Indian |
| 300. H Maroja vs M Diesen |
| ½-½ | 10 | 1979 | Virovitica | E20 Nimzo-Indian |
Kibitzing
