| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 351. A Kosten vs C McNab |
| 1-0 | 42 | 1989 | London NWYM | B09 Pirc, Austrian Attack |
| 352. M Wilder vs A Kosten |
| ½-½ | 10 | 1989 | FRA-chT | E11 Bogo-Indian Defense |
| 353. A Kosten vs J Levitt |
| ½-½ | 12 | 1989 | London NWYM | C02 French, Advance |
| 354. D Barua vs A Kosten |
| ½-½ | 28 | 1989 | London NWYM | B58 Sicilian |
| 355. J Dubois vs A Kosten |
| 0-1 | 39 | 1989 | FRA-chT | B21 Sicilian, 2.f4 and 2.d4 |
| 356. D Chevallier vs A Kosten |
| ½-½ | 35 | 1989 | FRA-chT | B33 Sicilian |
| 357. A Kosten vs S Conquest |
| 1-0 | 28 | 1989 | London NWYM | C55 Two Knights Defense |
| 358. A Kosten vs Speelman |
| ½-½ | 14 | 1989 | Hastings 1988/89 | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 359. Chandler vs A Kosten |
 | 1-0 | 61 | 1989 | Hastings 1988/89 | B62 Sicilian, Richter-Rauzer |
| 360. Short vs A Kosten |
| 1-0 | 43 | 1989 | Hastings 1988/89 | C18 French, Winawer |
| 361. A Kosten vs Gulko |
| ½-½ | 27 | 1989 | Hastings 1988/89 | C53 Giuoco Piano |
| 362. A Kosten vs Larsen |
| 0-1 | 53 | 1989 | Hastings 1988/89 | B56 Sicilian |
| 363. Korchnoi vs A Kosten |
| 1-0 | 31 | 1989 | Hastings 1988/89 | E32 Nimzo-Indian, Classical |
| 364. A Kosten vs Smyslov |
| ½-½ | 20 | 1989 | Hastings 1988/89 | C92 Ruy Lopez, Closed |
| 365. Speelman vs A Kosten |
| ½-½ | 23 | 1989 | Hastings 1988/89 | E12 Queen's Indian |
| 366. A Kosten vs Short |
| ½-½ | 27 | 1989 | Hastings 1988/89 | C92 Ruy Lopez, Closed |
| 367. Gulko vs A Kosten |
| 1-0 | 29 | 1989 | Hastings 1988/89 | E06 Catalan, Closed, 5.Nf3 |
| 368. P Olivier vs A Kosten |
| 0-1 | 49 | 1989 | Cannes Open | B58 Sicilian |
| 369. A Kosten vs G Markotic |
| 1-0 | 75 | 1989 | Cannes Open | B14 Caro-Kann, Panov-Botvinnik Attack |
| 370. A Kosten vs S Semkov |
| 1-0 | 38 | 1989 | Cannes Open | B44 Sicilian |
| 371. A Kosten vs J Koch |
| ½-½ | 53 | 1989 | Cannes Open | B72 Sicilian, Dragon |
| 372. Z Klaric vs A Kosten |
| ½-½ | 48 | 1989 | Cannes Open | A46 Queen's Pawn Game |
| 373. A Kosten vs R Polaczek |
| 1-0 | 32 | 1989 | Cannes Open | C55 Two Knights Defense |
| 374. Z S Ilic vs A Kosten |
| 0-1 | 54 | 1989 | Cannes Open | E11 Bogo-Indian Defense |
| 375. Benjamin vs A Kosten |
| ½-½ | 9 | 1989 | Cannes Open | E11 Bogo-Indian Defense |
Kibitzing
