Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1901 |
536 |
2070 | (76) | 9 |
| 1902 |
556 |
2069 | (79) | 0 |
| 1903 |
562 |
2069 | (80) | 0 |
| 1904 |
589 |
2068 | (80) | 0 |
| 1905 |
599 |
2067 | (78) | 0 |
| 1906 |
613 |
2067 | (74) | 0 |
| 1907 |
617 |
2066 | (67) | 0 |
| 1908 |
640 |
2066 | (58) | 14 |
| 1909 |
623 |
2092 | (58) | 0 |
| 1910 |
552 |
2117 | (54) | 0 |
| 1911 |
539 |
2143 | (42) | 30 |
| 1912 |
571 |
2125 | (50) | 0 |
| 1913 |
615 |
2106 | (48) | 20 |
| 1914 |
623 |
2079 | (58) | 0 |
| 1915 |
643 |
2052 | (64) | 6 |
| 1916 |
660 |
2037 | (73) | 0 |
| 1917 |
686 |
2022 | (80) | 0 |
| 1918 |
723 |
2007 | (85) | 0 |
| 1919 |
749 |
1992 | (89) | 0 |
| 1920 |
851 |
1977 | (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 |
| |
