Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. H MacGrillen vs D A MacDaeid |
 | 0-1 | 27 | 1965 | IRL-ch | A93 Dutch, Stonewall, Botvinnik Variation |
2. H MacGrillen vs S Kagan |
| ½-½ | 40 | 1966 | Orebro Stud olm prelim4 | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
3. H MacGrillen vs P Hohler |
| ½-½ | 33 | 1966 | Orebro Stud olm prelim4 | E12 Queen's Indian |
4. P N Lee vs H MacGrillen |
 | 1-0 | 33 | 1966 | Orebro Stud olm prelim4 | C95 Ruy Lopez, Closed, Breyer |
5. H MacGrillen vs P Hohler |
| 0-1 | 36 | 1966 | Orebro Stud olm fB | C95 Ruy Lopez, Closed, Breyer |
6. J Rodriguez Cordoba vs H MacGrillen |
| ½-½ | 18 | 1966 | Orebro Stud olm fB | D42 Queen's Gambit Declined, Semi-Tarrasch, 7.Bd3 |
7. H MacGrillen vs D Rivera |
| 1-0 | 43 | 1966 | Orebro Stud olm fB | A21 English |
8. S Bouaziz vs H MacGrillen |
| 1-0 | 41 | 1966 | Orebro Stud olm fB | E62 King's Indian, Fianchetto |
9. H MacGrillen vs P M Jamieson |
| 0-1 | 57 | 1966 | Orebro Stud olm fB | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
10. R Verstraeten vs H MacGrillen |
| ½-½ | 16 | 1966 | Orebro Stud olm fB | B09 Pirc, Austrian Attack |
11. H MacGrillen vs K Krantz |
| 0-1 | 25 | 1966 | Orebro Stud olm fB | A70 Benoni, Classical with 7.Nf3 |
12. T Bjornsson vs H MacGrillen |
| 1-0 | 40 | 1966 | Orebro Stud olm fB | E88 King's Indian, Samisch, Orthodox, 7.d5 c6 |
13. H MacGrillen vs L Holmstrand |
| 1-0 | 40 | 1968 | WchT U26 15th qual-D | D25 Queen's Gambit Accepted |
14. B Kristjansson vs H MacGrillen |
| ½-½ | 23 | 1968 | WchT U26 15th qual-D | C96 Ruy Lopez, Closed |
15. H MacGrillen vs Keene |
 | 0-1 | 61 | 1968 | WchT U26 15th qual-D | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
16. M Moe vs H MacGrillen |
| ½-½ | 21 | 1968 | WchT U26 15th qual-D | C27 Vienna Game |
17. J F de Saboya vs H MacGrillen |
| ½-½ | 19 | 1968 | WchT U26 15th fin-B | E50 Nimzo-Indian, 4.e3 O-O 5.Nf3, without ...d5 |
18. N Skalkotas vs H MacGrillen |
| 0-1 | 26 | 1968 | WchT U26 15th fin-B | E28 Nimzo-Indian, Samisch Variation |
19. E Eichhorn vs H MacGrillen |
| ½-½ | 27 | 1968 | WchT U26 15th fin-B | C78 Ruy Lopez |
20. D Levy vs H MacGrillen |
 | 0-1 | 49 | 1968 | WchT U26 15th fin-B | C45 Scotch Game |
21. H MacGrillen vs T Porrasmaa |
| ½-½ | 16 | 1968 | WchT U26 15th fin-B | E91 King's Indian |
22. H MacGrillen vs A Zwaig |
| ½-½ | 44 | 1968 | WchT U26 15th fin-B | A56 Benoni Defense |
23. H MacGrillen vs I Gat |
| ½-½ | 34 | 1968 | WchT U26 15th fin-B | E99 King's Indian, Orthodox, Taimanov |
24. O Seuss vs H MacGrillen |
| 0-1 | 47 | 1968 | WchT U26 15th fin-B | C91 Ruy Lopez, Closed |
25. H MacGrillen vs A Whiteley |
| ½-½ | 48 | 1968 | WchT U26 15th fin-B | D48 Queen's Gambit Declined Semi-Slav, Meran |