| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. P Collacott vs J Hardinge |
| 0-1 | 28 |
1962 |
U-18 S.C.C.U. Championship | E70 King's Indian |
| 2. J Hardinge vs D Hustler |
| 0-1 | 32 |
1963 |
Semi-Finals Bucks v Berks | B06 Robatsch |
| 3. J Hardinge vs P F Timson |
| 0-1 | 38 |
1964 |
Cambridge v Middlesex | E88 King's Indian, Samisch, Orthodox, 7.d5 c6 |
| 4. Alderson vs J Hardinge |
| 0-1 | 24 |
1964 |
Trinity I v Trinity II | B07 Pirc |
| 5. J Hardinge vs N Pyper |
| 0-1 | 26 |
1964 |
Cambridge Uni v Cambridge City | D35 Queen's Gambit Declined |
| 6. J Eyre vs J Hardinge |
| 0-1 | 31 |
1965 |
Cambridge v Civil Service | A15 English |
| 7. J Hardinge vs N J Argyris |
| 0-1 | 32 |
1965 |
v Clare | D10 Queen's Gambit Declined Slav |
| 8. N Gaprindashvili vs J Hardinge |
| 0-1 | 23 |
1965 |
? | B07 Pirc |
| 9. A H Crisp vs J Hardinge |
| 0-1 | 34 |
1965 |
Cambs v Suffolk | A49 King's Indian, Fianchetto without c4 |
| 10. P Sorenson vs J Hardinge |
| 0-1 | 29 |
1966 |
Trinity I v Caths | B09 Pirc, Austrian Attack |
| 11. H C Lewis vs J Hardinge |
| 0-1 | 14 |
1966 |
Cambridge University v Civil Service | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 12. J Hardinge vs NN |
 | 0-1 | 32 |
1966 |
v Selwyn | A67 Benoni, Taimanov Variation |
| 13. A K Manning vs J Hardinge |
| 0-1 | 25 |
1966 |
C.U. Championship | B07 Pirc |
| 14. J Hardinge vs D Thompson |
| 0-1 | 32 |
1966 |
C.U. Championship | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 15. R Davies vs J Hardinge |
| 0-1 | 49 |
1966 |
C.U. Championship | B09 Pirc, Austrian Attack |
| 16. S Alpern vs J Hardinge |
| 0-1 | 48 |
1967 |
Intercollegiate | D04 Queen's Pawn Game |
| 17. D E Bower vs J Hardinge |
| 0-1 | 26 |
1967 |
CUCC | D43 Queen's Gambit Declined Semi-Slav |
| 18. J Hardinge vs J Meyer |
| 0-1 | 24 |
1967 |
Intercollegiate | E75 King's Indian, Averbakh, Main line |
| 19. Keres vs J Hardinge |
 | 0-1 | 35 |
1967 |
Montreal Simultaneous Exhibition | B17 Caro-Kann, Steinitz Variation |
| 20. J Hardinge vs G Henderson |
| 0-1 | 35 |
1967 |
CUCC | A67 Benoni, Taimanov Variation |
| 21. A Langlois vs J Hardinge |
| 0-1 | 46 |
1967 |
Montreal | A16 English |
| 22. R Davies vs J Hardinge |
| 0-1 | 32 |
1967 |
Trinity v Pembroke | B09 Pirc, Austrian Attack |
| 23. J Hardinge vs S Barry |
| 0-1 | 56 |
1967 |
Intercollegiate | E46 Nimzo-Indian |
| 24. G Boos vs J Hardinge |
| 0-1 | 46 |
1967 |
Intercollegiate | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 25. J Hardinge vs J B Howson |
 | 0-1 | 34 |
1967 |
Cambs v Essex | D35 Queen's Gambit Declined |