event | round | table | player one | result | player two |
Grand Prix Rotterdam 2009 | 15 | 22 | Summersberger, Helmut (1894) | Won 2-1 | Zimmermann, Martin (1801) |
Grand Prix Bochum 2010 | 7 | 6 | Summersberger, Helmut (1939) | Won 2-0 | Zimmermann, Martin (1918) |
Grand Prix Gothenburg 2013 | 10 | 20 | Summersberger, Helmut (1885) | Lost 1-2 | Zimmermann, Martin (1902) |