Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1917 |
687 |
2061 | (80) | 4 |
| 1918 |
653 |
2084 | (73) | 0 |
| 1919 |
622 |
2107 | (64) | 5 |
| 1920 |
650 |
2115 | (57) | 11 |
| 1921 |
660 |
2129 | (59) | 0 |
| 1922 |
651 |
2143 | (57) | 0 |
| 1923 |
654 |
2157 | (50) | 11 |
| 1924 |
701 |
2150 | (50) | 8 |
| 1925 |
708 |
2153 | (50) | 12 |
| 1926 |
781 |
2141 | (60) | 0 |
| 1927 |
852 |
2129 | (65) | 0 |
| 1928 |
938 |
2117 | (66) | 10 |
Rating table notes
|
| Biographical data |
| Name: Groen, Sylvain Izaak |
| Born: |
| Died: |
|
| |
| References |
| Books |
| Di Felice, Chess Results, 1901-1920, page 306 |
| Di Felice, Chess Results, 1921-1930, page 325 |
| Skinner and Verhoeven, Alexander Alekhine's Chess Games, page 195 |
| Thulin, Name index to CTC, page 94 |
| Periodicals |
| [TNS], vol. 27, no. 6, 1 July 1919, page 128 |
| Web |
| Saunders, John. [Tournament: 16th British Chess Championship] |
| |
