| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J L Watson vs Lombardy |
| 0-1 | 35 |
1975 |
US Open | B43 Sicilian, Kan, 5.Nc3 |
| 2. J Donaldson vs J L Watson |
| 0-1 | 40 |
1976 |
Paul Keres Memorial | B08 Pirc, Classical |
| 3. J Flesch vs J L Watson |
| 0-1 | 42 |
1978 |
Lloyds Bank | E67 King's Indian, Fianchetto |
| 4. E Rayner vs J L Watson |
 | 0-1 | 30 |
1978 |
Lloyds Bank | C19 French, Winawer, Advance |
| 5. R C Balinas vs J L Watson |
| 0-1 | 28 |
1978 |
Lloyds Bank | E75 King's Indian, Averbakh, Main line |
| 6. J L Watson vs Y Rantanen |
| 0-1 | 63 |
1978 |
Lloyds Bank | A19 English, Mikenas-Carls, Sicilian Variation |
| 7. J L Watson vs K Shirazi |
| 0-1 | 22 |
1979 |
Lone | A28 English |
| 8. J L Watson vs Keene |
| 0-1 | 32 |
1981 |
New York (USA) | A36 English |
| 9. J L Watson vs Igor Ivanov |
| 0-1 | 38 |
1983 |
? | B13 Caro-Kann, Exchange |
| 10. DeFirmian vs J L Watson |
| 0-1 | 27 |
1984 |
Ch USA | C19 French, Winawer, Advance |
| 11. J L Watson vs C Hertan |
| 0-1 | 33 |
1984 |
CCA February Open | A10 English |
| 12. Browne vs J L Watson |
| 0-1 | 64 |
1993 |
World op Philadelphia | E94 King's Indian, Orthodox |
| 13. J L Watson vs Browne |
| 0-1 | 35 |
1994 |
Las Vegas (USA) | E11 Bogo-Indian Defense |
| 14. J L Watson vs Yermolinsky |
| 0-1 | 41 |
1994 |
it Reno USA | E11 Bogo-Indian Defense |
| 15. J L Watson vs M Donaghay |
| 0-1 | 29 |
1994 |
SNCL Div 1 Aberdeen 1-Castlehill 2 | C52 Evans Gambit |
| 16. Shaked vs J L Watson |
| 0-1 | 44 |
1995 |
American op 0 (06) | C02 French, Advance |
| 17. Fedorowicz vs J L Watson |
| 0-1 | 22 |
1995 |
CalChess/Mechanic's College | A50 Queen's Pawn Game |
| 18. J L Watson vs Aronian |
| 0-1 | 55 |
1999 |
Ubeda op 4th | A55 Old Indian, Main line |
| 19. J L Watson vs Goldin |
| 0-1 | 52 |
2003 |
US Championships 2003 | A20 English |
| 20. J L Watson vs Nakamura |
| 0-1 | 28 |
2003 |
US Championships 2003 | D44 Queen's Gambit Declined Semi-Slav |
