| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. P Cleghorn vs W Harris |
 | 0-1 | 21 |
1965 |
Las Vegas National open | B06 Robatsch |
| 2. P Cleghorn vs T Weinberger |
| ½-½ | 50 |
1971 |
US Open | C67 Ruy Lopez |
| 3. W Goichberg vs P Cleghorn |
| 0-1 | 55 |
1972 |
Lone Pine | C77 Ruy Lopez |
| 4. P Cleghorn vs P Koploy |
 | 0-1 | 16 |
1972 |
Lone Pine | C16 French, Winawer |
| 5. P Cleghorn vs T Hay |
| 1-0 | 39 |
1972 |
Lone Pine | B23 Sicilian, Closed |
| 6. R Stoutenborough vs P Cleghorn |
| 1-0 | 41 |
1972 |
Lone Pine | A30 English, Symmetrical |
| 7. R Ervin vs P Cleghorn |
| 0-1 | 37 |
1972 |
Lone Pine | C57 Two Knights |
| 8. P Cleghorn vs P Manetti |
| ½-½ | 21 |
1972 |
Lone Pine | B02 Alekhine's Defense |
| 9. P Cleghorn vs M Pollowitz |
| 1-0 | 62 |
1972 |
Lone Pine | B02 Alekhine's Defense |
| 10. A Menarini vs P Cleghorn |
| 0-1 | 26 |
1973 |
Lone Pine | B20 Sicilian |
| 11. P Cleghorn vs Tarjan |
| 0-1 | 25 |
1973 |
United States | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 12. P Cleghorn vs C B Jones |
| 1-0 | 23 |
1973 |
Lone Pine | B29 Sicilian, Nimzovich-Rubinstein |
| 13. R Ervin vs P Cleghorn |
| 1-0 | 29 |
1974 |
Lone Pine | B75 Sicilian, Dragon, Yugoslav Attack |
| 14. P Cleghorn vs R Newbold |
| ½-½ | 81 |
1974 |
Lone Pine | B31 Sicilian, Rossolimo Variation |
| 15. Keres vs P Cleghorn |
| 1-0 | 37 |
1975 |
Vancouver | B08 Pirc, Classical |
| 16. Martinovsky vs P Cleghorn |
| 0-1 | 25 |
1976 |
Lone Pine | A31 English, Symmetrical, Benoni Formation |
| 17. P Cleghorn vs Bisguier |
| 0-1 | 41 |
1976 |
Lone Pine | C60 Ruy Lopez |
| 18. P Cleghorn vs T Weinberger |
 | ½-½ | 50 |
1976 |
Lone Pine | C67 Ruy Lopez |
| 19. P Cleghorn vs Rohde |
| ½-½ | 38 |
1976 |
Lone Pine | B06 Robatsch |
| 20. N Weinstein vs P Cleghorn |
| ½-½ | 36 |
1976 |
Lone Pine | A07 King's Indian Attack |
| 21. Christiansen vs P Cleghorn |
 | 1-0 | 16 |
1976 |
Lone Pine | A34 English, Symmetrical |
| 22. P Cleghorn vs Biyiasas |
 | 1-0 | 52 |
1976 |
Lone Pine | B27 Sicilian |
| 23. P Cleghorn vs R Ervin |
| ½-½ | 41 |
1977 |
Lone Pine | C19 French, Winawer, Advance |
| 24. Sahovic vs P Cleghorn |
| 1-0 | 46 |
1977 |
Lone Pine | A48 King's Indian |
| 25. L Shamkovich vs P Cleghorn |
| 1-0 | 53 |
1977 |
Lone Pine | B36 Sicilian, Accelerated Fianchetto |