| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 276. K Thorsteins vs B Nisman |
| 1-0 | 37 | 1989 | Warsaw Open | D10 Queen's Gambit Declined Slav |
| 277. J Woda vs K Thorsteins |
| ½-½ | 43 | 1989 | Warsaw Open | B59 Sicilian, Boleslavsky Variation, 7.Nb3 |
| 278. H Sorensen vs K Thorsteins |
| ½-½ | 66 | 1989 | Copenhagen Open | D93 Grunfeld, with Bf4 & e3 |
| 279. K Thorsteins vs J Hvenekilde |
| 1-0 | 42 | 1989 | Copenhagen Open | D09 Queen's Gambit Declined, Albin Counter Gambit, 5.g3 |
| 280. D Ciric vs K Thorsteins |
| ½-½ | 12 | 1989 | Copenhagen Open | B88 Sicilian, Fischer-Sozin Attack |
| 281. K Thorsteins vs R Bellin |
| ½-½ | 28 | 1989 | Copenhagen Open | A84 Dutch |
| 282. H Molvig vs K Thorsteins |
| 0-1 | 31 | 1989 | Copenhagen Open | B59 Sicilian, Boleslavsky Variation, 7.Nb3 |
| 283. K Thorsteins vs L B Hansen |
| 0-1 | 70 | 1989 | Copenhagen Open | E38 Nimzo-Indian, Classical, 4...c5 |
| 284. K Thorsteins vs J Hartung-Nielsen |
| 1-0 | 38 | 1989 | Copenhagen Open | D33 Queen's Gambit Declined, Tarrasch |
| 285. J Franzen vs K Thorsteins |
| 1-0 | 58 | 1989 | Copenhagen Open | B31 Sicilian, Rossolimo Variation |
| 286. K Thorsteins vs H Holmsgaard |
| ½-½ | 17 | 1989 | Copenhagen Open | E39 Nimzo-Indian, Classical, Pirc Variation |
| 287. K Kaunas vs K Thorsteins |
| 1-0 | 33 | 1989 | Copenhagen Open | D82 Grunfeld, 4.Bf4 |
| 288. K Thorsteins vs G Gislason |
| 1-0 | 26 | 1989 | ISL-ch | D87 Grunfeld, Exchange |
| 289. S Polgar vs K Thorsteins |
| ½-½ | 33 | 1989 | 7th ECC quarterfinal | B14 Caro-Kann, Panov-Botvinnik Attack |
| 290. K Thorsteins vs S Polgar |
| 1-0 | 51 | 1989 | 7th ECC quarterfinal | A30 English, Symmetrical |
| 291. Jansa vs K Thorsteins |
| 0-1 | 27 | 1990 | Arnold Cup | B63 Sicilian, Richter-Rauzer Attack |
| 292. Benjamin vs K Thorsteins |
| ½-½ | 25 | 1990 | Reykjavik Summit | A35 English, Symmetrical |
| 293. K Thorsteins vs Polugaevsky |
| ½-½ | 36 | 1990 | Reykjavik Summit | E21 Nimzo-Indian, Three Knights |
| 294. K Thorsteins vs Suba |
| ½-½ | 35 | 1990 | Reykjavik Summit | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 295. K Thorsteins vs A Kosten |
| ½-½ | 68 | 1990 | Reykjavik Summit | E30 Nimzo-Indian, Leningrad |
| 296. K Thorsteins vs A A Arnason |
| 1-0 | 38 | 1990 | Reykjavik Open | A14 English |
| 297. K Thorsteins vs Browne |
| 1-0 | 31 | 1990 | Reykjavik Open | E21 Nimzo-Indian, Three Knights |
| 298. Petursson vs K Thorsteins |
| 0-1 | 37 | 1990 | Reykjavik Open | B09 Pirc, Austrian Attack |
| 299. K Thorsteins vs Dolmatov |
| ½-½ | 17 | 1990 | Reykjavik Open | A88 Dutch, Leningrad, Main Variation with c6 |
| 300. Azmaiparashvili vs K Thorsteins |
| 1-0 | 57 | 1990 | Reykjavik Open | A25 English |
Kibitzing
