Ratings
| Year |
Rank |
Edo |
Dev. |
Games |
| 1901 |
566 |
2074 | (76) | 9 |
| 1902 |
578 |
2073 | (79) | 0 |
| 1903 |
586 |
2072 | (80) | 0 |
| 1904 |
609 |
2071 | (80) | 0 |
| 1905 |
622 |
2070 | (78) | 0 |
| 1906 |
631 |
2070 | (74) | 0 |
| 1907 |
647 |
2069 | (67) | 0 |
| 1908 |
673 |
2068 | (58) | 14 |
| 1909 |
649 |
2092 | (58) | 0 |
| 1910 |
581 |
2117 | (54) | 0 |
| 1911 |
564 |
2142 | (42) | 30 |
| 1912 |
614 |
2115 | (48) | 0 |
| 1913 |
669 |
2088 | (45) | 29 |
| 1914 |
716 |
2064 | (57) | 0 |
| 1915 |
726 |
2040 | (63) | 6 |
| 1916 |
744 |
2026 | (73) | 0 |
| 1917 |
768 |
2012 | (80) | 0 |
| 1918 |
799 |
1998 | (85) | 0 |
| 1919 |
831 |
1984 | (89) | 0 |
| 1920 |
939 |
1970 | (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 |
| |
