| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 376. M Apicella vs A Kosten |
 | 1-0 | 42 | 1989 | Cannes Open | B89 Sicilian |
| 377. A Kosten vs G Andruet |
| ½-½ | 32 | 1989 | Val Maubuee | B07 Pirc |
| 378. A Kosten vs D Sellos |
| 1-0 | 39 | 1989 | Val Maubuee | B81 Sicilian, Scheveningen, Keres Attack |
| 379. A Kosten vs G Flear |
| ½-½ | 11 | 1989 | Val Maubuee | C53 Giuoco Piano |
| 380. M Apicella vs A Kosten |
| 0-1 | 34 | 1989 | Val Maubuee | B45 Sicilian, Taimanov |
| 381. A Kosten vs Shirov |
 | ½-½ | 22 | 1989 | Val Maubuee | B23 Sicilian, Closed |
| 382. B Abramovic vs A Kosten |
| ½-½ | 62 | 1989 | Val Maubuee | B25 Sicilian, Closed |
| 383. A Kosten vs J Boudre |
| 1-0 | 59 | 1989 | Val Maubuee | C77 Ruy Lopez |
| 384. Kupreichik vs A Kosten |
| 1-0 | 33 | 1989 | Val Maubuee | C02 French, Advance |
| 385. J Hector vs A Kosten |
| 0-1 | 51 | 1989 | Val Maubuee | B45 Sicilian, Taimanov |
| 386. A Kosten vs L Brunner |
| ½-½ | 38 | 1989 | Noviki-A | C67 Ruy Lopez |
| 387. A Kosten vs Gavrikov |
| 0-1 | 49 | 1989 | Noviki-A | B23 Sicilian, Closed |
| 388. A Kosten vs L Bass |
| 0-1 | 47 | 1989 | Noviki-A | B14 Caro-Kann, Panov-Botvinnik Attack |
| 389. A Kosten vs T Tolnai |
| 1-0 | 31 | 1989 | Noviki-A | B70 Sicilian, Dragon Variation |
| 390. A Kosten vs Krasenkow |
| 0-1 | 40 | 1989 | Noviki-A | C77 Ruy Lopez |
| 391. A Mikhalchishin vs A Kosten |
| ½-½ | 68 | 1989 | Noviki-A | B09 Pirc, Austrian Attack |
| 392. J van Mil vs A Kosten |
| 1-0 | 43 | 1989 | Noviki-A | B22 Sicilian, Alapin |
| 393. U Boensch vs A Kosten |
| ½-½ | 42 | 1989 | Noviki-A | A41 Queen's Pawn Game (with ...d6) |
| 394. J Horvath vs A Kosten |
| 1-0 | 49 | 1989 | Noviki-A | E32 Nimzo-Indian, Classical |
| 395. C Hoi vs A Kosten |
| ½-½ | 9 | 1989 | Noviki-A | D01 Richter-Veresov Attack |
| 396. A Kosten vs M Pastorini |
| 1-0 | 19 | 1989 | Forli Open | B80 Sicilian, Scheveningen |
| 397. Forintos vs A Kosten |
| ½-½ | 14 | 1989 | Forli Open | E32 Nimzo-Indian, Classical |
| 398. A Kosten vs B Belotti |
| ½-½ | 48 | 1989 | Forli Open | B65 Sicilian, Richter-Rauzer Attack, 7...Be7 Defense, 9...Nxd4 |
| 399. A Vaisser vs A Kosten |
| 1-0 | 39 | 1989 | Forli Open | A42 Modern Defense, Averbakh System |
| 400. A Kosten vs Delchev |
| 1-0 | 66 | 1989 | Forli Open | E54 Nimzo-Indian, 4.e3, Gligoric System |
Kibitzing
