| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 501. D Hassabis vs W N Watson |
| 0-1 | 32 | 1990 | British Championship | E73 King's Indian |
| 502. W N Watson vs I Findlay |
| 1-0 | 47 | 1990 | British Championship | B70 Sicilian, Dragon Variation |
| 503. P J Morris vs W N Watson |
| 1-0 | 62 | 1990 | British Championship | B76 Sicilian, Dragon, Yugoslav Attack |
| 504. W N Watson vs J Emms |
| ½-½ | 29 | 1990 | British Championship | C28 Vienna Game |
| 505. A Collinson vs W N Watson |
| 0-1 | 50 | 1990 | British Championship | B08 Pirc, Classical |
| 506. W N Watson vs A D Martin |
| 1-0 | 43 | 1990 | British Championship | B00 Uncommon King's Pawn Opening |
| 507. Adams vs W N Watson |
 | 1-0 | 32 | 1990 | British Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 508. W N Watson vs A Jones |
| 1-0 | 31 | 1990 | British Championship | B45 Sicilian, Taimanov |
| 509. Plaskett vs W N Watson |
 | 1-0 | 62 | 1990 | British Championship | E81 King's Indian, Samisch |
| 510. W N Watson vs R Tozer |
| ½-½ | 34 | 1990 | British Championship | B01 Scandinavian |
| 511. M Basman vs W N Watson |
| 0-1 | 42 | 1990 | British Championship | A00 Uncommon Opening |
| 512. B Adler vs W N Watson |
| ½-½ | 29 | 1990 | Lyon Open | E77 King's Indian |
| 513. B Carlier vs W N Watson |
| ½-½ | 23 | 1990 | Lyon Open | A05 Reti Opening |
| 514. J Cortes Moyano vs W N Watson |
| 0-1 | 33 | 1990 | Lyon Open | B72 Sicilian, Dragon |
| 515. C Ohl vs W N Watson |
| 0-1 | 39 | 1990 | Lyon Open | A10 English |
| 516. W N Watson vs B Barth Sahl |
| 0-1 | 31 | 1990 | Lyon Open | C91 Ruy Lopez, Closed |
| 517. W N Watson vs Jansa |
| 1-0 | 38 | 1991 | Herning | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 518. Van der Wiel vs W N Watson |
| 0-1 | 49 | 1991 | Mondorf Masters Open | B72 Sicilian, Dragon |
| 519. W N Watson vs J Littlewood |
| 1-0 | 41 | 1991 | London | C91 Ruy Lopez, Closed |
| 520. J Sloth vs W N Watson |
| 0-1 | 34 | 1991 | Herning | A04 Reti Opening |
| 521. R Stone vs W N Watson |
| ½-½ | 14 | 1991 | Troll Masters | E90 King's Indian |
| 522. M Cebalo vs W N Watson |
| 1-0 | 37 | 1991 | Herning | E97 King's Indian |
| 523. A Fishbein vs W N Watson |
| ½-½ | 32 | 1991 | Herning | A21 English |
| 524. F Hellers vs W N Watson |
| ½-½ | 31 | 1991 | Herning | B77 Sicilian, Dragon, Yugoslav Attack |
| 525. J Sorensen vs W N Watson |
| 0-1 | 39 | 1991 | Herning | B72 Sicilian, Dragon |
Kibitzing
