Thank you Brian. Interesting to hear about the 1977 weekend event. I had not heard of the Aaronson weekend events before. It is slightly confusing because the second Aaronson Masters was in Harrow as well, not in the Imperial Hotel, and in April 1978. Not sure how long both events ran for (the weekenders in September and the Masters in March/April)?
I have now managed to confirm that the sparkling win over Nunn by a young Hodgson (who was 15 at the time) was indeed at the 1978 Aaronson weekend congress in Harrow (sometimes called the "Aaronson International Open"):
https://exeterchessclub.org.uk/content/ ... fter-1e4-2
"Hodgson - Nunn, Aaronson Open"
5... e6 and now 6. f5, 6.e5, 6.O-O, 6. d3, and 6.a3 have been tried. Since Grandmaster Nunn lost this dashing game to the young Hodgson, hardly anyone has tried this line!
That confirms Nunn was a GM at the time, so title had been awarded earlier in the year.
Also a BCM reference (p.483, 1978 volume):
Hodgson beat Nunn at the recent Aaronson tournament, about a month after the Robert Silk, with an f5 idea in this sort of variation.
And from CHESS (1991 volume):
One example of its power was shown in a win by a young Julian Hodgson against John Nunn at the Aaronson Open.
So the Hodgson-Nunn game is well documented.
However, I have been unable to find any trace of the other game Hodgson is said to have won against a GM, either before or after this game.
If it proves not possible to track down contemporary reports in the chess press, then I suppose Julian Hodgson himself would, you hope, remember! Even if the game has not been preserved.
I did find one other game from this 1978 Aaronson Open that has been preserved, a draw against Hungarian GM Győző Forintos by Glenn Lambert, who sadly
died in 2003.
https://hampshirechesshistory.co.uk/wp- ... s-1979.pdf
From
Chess Notes (1 January 1979, p.2):
The following high-quality game was played in the first round of the 1978 Aaronson Open Tournament in which the Hungarian Grand master, G. Forintos, had the White pieces against the Portsmouth Chess Club player, Glenn Lambert (who is currently graded 208 and who supplied the notes).
1. P-Q4 N-KB3; 2. P-QB4 P-K3; 3. N-QB3 P-Q4; 4. N-B3 B-K2; 5. B-B4 O-O; 6. P-K3 P-QB4; 7. QP x P N-B3; 8. P-QR3 B x P; 9. Q-B2 Q-R4; 10. R-Q1 R-K1 (this move was played in the 21st match game Korchnoi-Karpov, with the sacrifice 12. ... N-Q5 in mind. Probably stronger is 10. ... B-K2, which Karpov played in the 23rd game); 11. N-Q2, P-K4; 12. B-N5 N-Q5; 13. Q-N1 (13. P x N? P x P +; 14. N-K2 N-N5; 15. B-R4 P x P is good for Black); 13. ... B-B4; 14. B-Q3 P-K5; 15. B-K2? (Korchnoi played 15. B-B2 and won, but it was unconvincing; perhaps best of all is 15. B-B1) 15. ... N x B; 16. N x N B-K2; 17. O-O B-KN5; 18. KR-K1 P x P; 19. B x N B x B; 20. N x BP Q-R3; 21. P-QN3 QR-Q1; 22. R x R R x R; 23. P-QR4 B x N; 24. R x B B-B6; 25. R-B2 B-N5; 26. R-B1 Q-K3; 27. R-Q1 R-Q4; 28. Q-R1 Q-Q2; 29. R x R Q x R; 30. Q-Q4 Q x Q; 31. P x Q P-B4; 32. P-B3 P x P; 33. P x P K-B2; 34. P-Q5 P-KN4; 35. K-B2 K-B3; 36. K-N3 P-KR4; 37. P-R3 B-B6; 38. P-B4 B-K8+; 39. K-N2 P-N5 See Diagram: White now offered the draw, which Black accepted. [diagram] J.E.C.G.
Had to manually correct most of the OCR of the descriptive notation. Maybe some kind soul could convert into algebraic? I may try that later.
(Posting after seeing John's finding of the answer! Thanks, John! *BIG FACE PALM* that was obvious)