Paul Saladin Leonhardt vs John De Soyres
DCA Congress 31st Hilversum NED 1903.08.??
Vienna Game: Heyde Variation 1-0

Jan Frederik Heemskerk vs John De Soyres
DCA Congress 31st Hilversum NED round 4 1903.08.??
English Opening: Mikenas-Carls Variation 1-0

John De Soyres vs Arthur Skipworth
Counties Chess Association Boston ENG 1880.01.??
French Defense: Alekhine-Chatard Attack 1-0

John De Soyres vs Benjamin Leussen
DCA Congress 31st Hilversum NED round 8 1903.08.??
Sicilian Defense: Alapin Variation 0-1