| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. P Youngworth vs H Olafsson |
| 0-1 | 34 |
1978 |
Lone Pine | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 2. J Loftsson vs P Youngworth |
| 1-0 | 47 |
1978 |
Lone Pine | D94 Grunfeld |
| 3. P Youngworth vs Shamkovich |
| 0-1 | 30 |
1978 |
Lone Pine (USA) | A62 Benoni, Fianchetto Variation |
| 4. D Verduga vs P Youngworth |
| 1-0 | 43 |
1978 |
Lone Pine | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 5. P Youngworth vs K Rogoff |
| 0-1 | 46 |
1978 |
Lone Pine | A63 Benoni, Fianchetto, 9...Nbd7 |
| 6. L Day vs P Youngworth |
| 1-0 | 52 |
1979 |
Atlantic Open | B10 Caro-Kann |
| 7. R C Balinas vs P Youngworth |
| 1-0 | 38 |
1979 |
Lone Pine op | B20 Sicilian |
| 8. P Youngworth vs E Formanek |
| 0-1 | 29 |
1979 |
Lone Pine op | A27 English, Three Knights System |
| 9. P Youngworth vs Petursson |
| 0-1 | 54 |
1979 |
Lone Pine USA | E01 Catalan, Closed |
| 10. G Ligterink vs P Youngworth |
 | 1-0 | 29 |
1979 |
Lone Pine op | B58 Sicilian |
| 11. P Youngworth vs S Nikolic |
| 0-1 | 74 |
1979 |
Lone Pine op | A28 English |
| 12. P Youngworth vs V Raicevic |
| 0-1 | 39 |
1980 |
Lone Pine | D37 Queen's Gambit Declined |
| 13. P Youngworth vs Gligoric |
 | 0-1 | 84 |
1980 |
Lone Pine op | D34 Queen's Gambit Declined, Tarrasch |
| 14. DeFirmian vs P Youngworth |
 | 1-0 | 43 |
1980 |
Lone Pine (USA) | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 15. D Rajkovic vs P Youngworth |
| 1-0 | 29 |
1980 |
Lone Pine | D90 Grunfeld |
| 16. P Youngworth vs J Peters |
| 0-1 | 36 |
1980 |
Lone Pine | A62 Benoni, Fianchetto Variation |
| 17. P Youngworth vs J L Arnason |
| 0-1 | 50 |
1981 |
Lone Pine | A64 Benoni, Fianchetto, 11...Re8 |
| 18. P Youngworth vs DeFirmian |
 | 0-1 | 37 |
1981 |
Lone Pine (USA) | A62 Benoni, Fianchetto Variation |
| 19. R Henley vs P Youngworth |
| 1-0 | 31 |
1981 |
Lone Pine | E94 King's Indian, Orthodox |
| 20. P Youngworth vs Dzindzichashvili |
| 0-1 | 59 |
1981 |
Lone Pine (USA) | E41 Nimzo-Indian |