Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. Capablanca vs H Mattison |
 | 0-1 | 58 | 1913 | Simul, 28b | C65 Ruy Lopez, Berlin Defense |
2. V Svensons vs H Mattison |
| ½-½ | 54 | 1915 | Riga Chess Club | C54 Giuoco Piano |
3. F Apsenieks vs H Mattison |
| 0-1 | 60 | 1924 | 1st Latvian congress | E11 Bogo-Indian Defense |
4. M Golmayo vs H Mattison |
| 0-1 | 31 | 1924 | Paris Unofficial Olympiad | B03 Alekhine's Defense |
5. H Mattison vs K Havasi |
| 1-0 | 35 | 1924 | Paris Unofficial Olympiad | D13 Queen's Gambit Declined Slav, Exchange Variation |
6. D Reca vs H Mattison |
 | ½-½ | 69 | 1924 | Paris Unofficial Olympiad | E11 Bogo-Indian Defense |
7. H Mattison vs L Palau |
| 1-0 | 39 | 1924 | Paris Unofficial Olympiad | C14 French, Classical |
8. H Mattison vs K Sterk |
| ½-½ | 17 | 1924 | Paris Unofficial Olympiad | B15 Caro-Kann |
9. F Jonet vs H Mattison |
| 0-1 | 36 | 1924 | Paris Unofficial Olympiad | E11 Bogo-Indian Defense |
10. Colle vs H Mattison |
| ½-½ | 45 | 1924 | Paris Unofficial Olympiad | D90 Grunfeld |
11. H Mattison vs E M Holloway |
| 1-0 | 59 | 1924 | Paris Unofficial Olympiad | C49 Four Knights |
12. Hromadka vs H Mattison |
| 0-1 | 60 | 1924 | Paris Unofficial Olympiad | C29 Vienna Gambit |
13. F Apsenieks vs H Mattison |
| ½-½ | 35 | 1924 | Paris Unofficial Olympiad | C48 Four Knights |
14. H Mattison vs A Vajda |
| ½-½ | 46 | 1924 | Paris Unofficial Olympiad | C68 Ruy Lopez, Exchange |
15. H Mattison vs Euwe |
  | 0-1 | 50 | 1924 | Paris Unofficial Olympiad | D10 Queen's Gambit Declined Slav |
16. H Mattison vs G Wright |
 | 1-0 | 30 | 1925 | Bromley prel-A | C14 French, Classical |
17. O Mueller vs H Mattison |
| ½-½ | 69 | 1925 | Bromley prel-A | E21 Nimzo-Indian, Three Knights |
18. H Mattison vs M Romi |
| 1-0 | 29 | 1925 | Bromley prel-A | C49 Four Knights |
19. K Skalicka vs H Mattison |
| ½-½ | 43 | 1925 | Bromley Premier-A Final | E11 Bogo-Indian Defense |
20. H Mattison vs Hromadka |
| 1-0 | 35 | 1925 | Bromley Premier-A Final | D14 Queen's Gambit Declined Slav, Exchange Variation |
21. F Apsenieks vs H Mattison |
| 0-1 | 31 | 1925 | Bromley Premier-A Final | C55 Two Knights Defense |
22. P Johner vs H Mattison |
 | 0-1 | 35 | 1925 | Debrecen | E11 Bogo-Indian Defense |
23. H Mattison vs G Nagy |
 | 0-1 | 23 | 1925 | Debrecen | C15 French, Winawer |
24. L Prokes vs H Mattison |
| 1-0 | 64 | 1925 | Debrecen | B10 Caro-Kann |
25. H Mattison vs J A Seitz |
| 1-0 | 56 | 1925 | Debrecen | B28 Sicilian, O'Kelly Variation |