Paul F Johner vs Hermanis Karlovich Mattison
Debrecen Debrecen HUN round 1 1925.??.??
Bogo-Indian Defense 0-1

Fricis Apsenieks vs Hermanis Karlovich Mattison
1st Latvian congress Riga LAT 1924.04.??
Bogo-Indian Defense 0-1

Hermanis Karlovich Mattison vs Edith Martha Holloway
Paris Unofficial Olympiad Paris FRA round 3 1924.07.??
Four Knights Game: Alatortsev Variation 1-0

Fricis Apsenieks vs Hermanis Karlovich Mattison
Bromley Premier-A Final Bromley ENG round 3 1925.04.18
Italian Game: Giuoco Piano 0-1

Albert Becker vs Hermanis Karlovich Mattison
Karlsbad Karlsbad CSR round 9 1929.08.10
Blackburne Shilling Gambit 1-0

Kornel Havasi vs Hermanis Karlovich Mattison
Debrecen Debrecen HUN round 10 1925.??.??
Indian Defense: Medusa Gambit 1-0