| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 251. M Diesen vs N Kirov |
| ½-½ | 15 | 1978 | Odzaci | D80 Grunfeld |
| 252. V Konc vs M Diesen |
| 0-1 | 24 | 1978 | Odzaci | A59 Benko Gambit |
| 253. M Diesen vs D M Markovic |
| 1-0 | 40 | 1978 | Odzaci | A57 Benko Gambit |
| 254. Plachetka vs M Diesen |
 | 1-0 | 35 | 1978 | Odzaci | D43 Queen's Gambit Declined Semi-Slav |
| 255. M Diesen vs V Raicevic |
| ½-½ | 100 | 1978 | Odzaci | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 256. N Minev vs M Diesen |
| ½-½ | 8 | 1978 | Odzaci | E15 Queen's Indian |
| 257. E Cobo Arteaga vs M Diesen |
| ½-½ | 12 | 1978 | Odzaci | D59 Queen's Gambit Declined, Tartakower |
| 258. R Gruchacz vs M Diesen |
| ½-½ | 31 | 1979 | Marshall Open | B45 Sicilian, Taimanov |
| 259. M Diesen vs L D Evans |
| ½-½ | 31 | 1979 | Marshall Open | A14 English |
| 260. O Popovych vs M Diesen |
| 1-0 | 33 | 1979 | Marshall Open | B82 Sicilian, Scheveningen |
| 261. M Diesen vs M Wilder |
| 1-0 | 41 | 1979 | Marshall Open | E91 King's Indian |
| 262. M Diesen vs W J Adam |
| ½-½ | 31 | 1979 | Marshall Open | E21 Nimzo-Indian, Three Knights |
| 263. M Diesen vs J Rigo |
| ½-½ | 28 | 1979 | Lone Pine | E20 Nimzo-Indian |
| 264. de Firmian vs M Diesen |
| ½-½ | 14 | 1979 | Lone Pine | B08 Pirc, Classical |
| 265. M Diesen vs J Whitehead |
| 1-0 | 46 | 1979 | Lone Pine | E41 Nimzo-Indian |
| 266. Chandler vs M Diesen |
| 0-1 | 56 | 1979 | Lone Pine | C63 Ruy Lopez, Schliemann Defense |
| 267. Miles vs M Diesen |
| ½-½ | 31 | 1979 | Lone Pine | A28 English |
| 268. M Diesen vs Gligoric |
| 0-1 | 60 | 1979 | Lone Pine | E20 Nimzo-Indian |
| 269. M Diesen vs M Paolozzi |
| 1-0 | 63 | 1979 | Lone Pine | A56 Benoni Defense |
| 270. Korchnoi vs M Diesen |
| ½-½ | 36 | 1979 | Lone Pine | A19 English, Mikenas-Carls, Sicilian Variation |
| 271. Shamkovich vs M Diesen |
| ½-½ | 55 | 1979 | Lone Pine | B83 Sicilian |
| 272. M Diesen vs K Hulak |
| 0-1 | 38 | 1979 | Karlovac | A33 English, Symmetrical |
| 273. V Bukal Sr vs M Diesen |
| 0-1 | 34 | 1979 | Karlovac | A15 English |
| 274. M Diesen vs M Pisar |
| 1-0 | 32 | 1979 | Karlovac | E07 Catalan, Closed |
| 275. L Vadasz vs M Diesen |
| ½-½ | 41 | 1979 | Karlovac | E67 King's Indian, Fianchetto |
Kibitzing
