Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1901 |
421 |
2064 | (77) | 9 |
| 1902 |
427 |
2064 | (80) | 0 |
| 1903 |
433 |
2064 | (81) | 0 |
| 1904 |
452 |
2063 | (80) | 0 |
| 1905 |
476 |
2063 | (78) | 0 |
| 1906 |
492 |
2063 | (74) | 0 |
| 1907 |
507 |
2063 | (68) | 0 |
| 1908 |
509 |
2063 | (59) | 14 |
| 1909 |
490 |
2088 | (59) | 0 |
| 1910 |
440 |
2114 | (55) | 0 |
| 1911 |
433 |
2139 | (44) | 30 |
| 1912 |
428 |
2123 | (52) | 0 |
| 1913 |
420 |
2107 | (51) | 20 |
| 1914 |
410 |
2090 | (64) | 0 |
| 1915 |
399 |
2073 | (74) | 0 |
| 1916 |
419 |
2055 | (80) | 0 |
| 1917 |
417 |
2038 | (86) | 0 |
| 1918 |
428 |
2021 | (89) | 0 |
| 1919 |
439 |
2003 | (92) | 0 |
| 1920 |
517 |
1986 | (94) | 6 |
Rating table notes
|
| Biographical data |
| Name: Isakov, Konstantin Ivanovich |
| Born: |
| Died: |
|
| |
| References |
| Books |
| Di Felice, Chess Results, 1901-1920, page 307 |
| Gaige, Chess Personalia, page 187 |
| Thulin, Name index to CTC, page 118 |
| |
