1. e4 c5 2. d4 cxd4 3. Nf3 Qa5+ 4. Bd2 Qb6 5. Na3 Nc6 6. Bd3 e5 7. Nc4 Qc7 8. a4 Nf6 9. O-O Be7 10. c3 d5 11. exd5 Nxd5 12. Re1 dxc3 13. bxc3 Bg4 14. Rb1 Bf6 15. Rxb7 Qd8 16. Ncxe5 Nxe5 17. Nxe5 Bxd1 18. Ng6+ Ne7 19. Bb5+ Qd7 20. Bxd7+ Kd8 21. Nxh8 Bc2 22. Nxf7#

1-0

Source(s): BCM, vol. LXIX (1949), p. 129.

Event information: 24th Hastings Premier 1948/49, BritBase (ed. John Saunders).

Other information: Photo of O'Sullivan in round 1 of this event (farthest away from camera), John Saunders, English Chess Forum, April 23, 2022 (identified by Leonard Barden in the post immediately following).