Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1901 |
530 |
2073 | (77) | 9 |
| 1902 |
545 |
2073 | (79) | 0 |
| 1903 |
550 |
2072 | (80) | 0 |
| 1904 |
578 |
2072 | (80) | 0 |
| 1905 |
587 |
2071 | (78) | 0 |
| 1906 |
599 |
2071 | (74) | 0 |
| 1907 |
609 |
2070 | (67) | 0 |
| 1908 |
628 |
2070 | (58) | 14 |
| 1909 |
612 |
2095 | (58) | 0 |
| 1910 |
547 |
2121 | (54) | 0 |
| 1911 |
539 |
2147 | (43) | 30 |
| 1912 |
564 |
2128 | (50) | 0 |
| 1913 |
609 |
2110 | (48) | 20 |
| 1914 |
620 |
2082 | (58) | 0 |
| 1915 |
645 |
2055 | (64) | 6 |
| 1916 |
665 |
2040 | (73) | 0 |
| 1917 |
678 |
2024 | (80) | 0 |
| 1918 |
719 |
2009 | (85) | 0 |
| 1919 |
749 |
1994 | (89) | 0 |
| 1920 |
846 |
1979 | (92) | 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 |
| Skinner and Verhoeven, Alexander Alekhine's Chess Games, page 17, 19 |
| Thulin, Name index to CTC, page 118 |
| |
