Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1917 |
620 |
2057 | (80) | 4 |
| 1918 |
605 |
2080 | (74) | 0 |
| 1919 |
575 |
2103 | (65) | 5 |
| 1920 |
608 |
2110 | (57) | 11 |
| 1921 |
616 |
2124 | (60) | 0 |
| 1922 |
594 |
2138 | (58) | 0 |
| 1923 |
589 |
2151 | (51) | 11 |
| 1924 |
652 |
2143 | (51) | 8 |
| 1925 |
654 |
2147 | (51) | 12 |
| 1926 |
717 |
2135 | (60) | 0 |
| 1927 |
789 |
2123 | (65) | 0 |
| 1928 |
828 |
2112 | (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] |
| |
