| Olympic Games 1912 - Appearances as Referee |  |
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 |
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| 30/06/1912 | Great Britain | - | Hungary | 7:0 | - | - | - |
| 01/07/1912 | Germany | - | Russia | 16:0 | - | - | - |
| 03/07/1912 | Hungary | - | Germany | 3:1 | - | - | - |
| 04/07/1912 | Great Britain | - | Denmark | 4:2 | - | - | - |
| Olympic Games 1912 - Appearances as Referee | |
|
|
||||
| 30/06/1912 | Great Britain | - | Hungary | 7:0 | - | - | - |
| 01/07/1912 | Germany | - | Russia | 16:0 | - | - | - |
| 03/07/1912 | Hungary | - | Germany | 3:1 | - | - | - |
| 04/07/1912 | Great Britain | - | Denmark | 4:2 | - | - | - |
| Complete name: | Christiaan Jacobus Groothoff |
| Born: | 11/09/1878 † 28/01/1954 |
| Place of birth: |
Zaltbommel, 
Netherlands |
| Nationality: |
Netherlands |