Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1908 |
1192 |
1493 | (85) | 9 |
| 1909 |
1282 |
1520 | (83) | 0 |
| 1910 |
1263 |
1547 | (79) | 0 |
| 1911 |
1264 |
1574 | (72) | 13 |
| 1912 |
1228 |
1555 | (73) | 18 |
Rating table notes
|
| Biographical data |
| Name: Duff, J.C. |
| Born: |
| Died: |
|
| |
| References |
| Books |
| Di Felice, Chess Results, 1901-1920, page 303 |
| Periodicals |
| [MeL], no. 2963, 19 Oct. 1912, page 55 |
| |
