| Ratings 
 
 
  | Year | Rank | Edo | Dev. | Games |  
  | 1918 | 623 | 2091 | (76) | 5 |  
  | 1919 | 653 | 2077 | (69) | 5 |  
  | 1920 | 725 | 2068 | (69) | 0 |  
  | 1921 | 801 | 2059 | (65) | 7 |  
  | 1922 | 824 | 2067 | (69) | 0 |  
  | 1923 | 886 | 2075 | (71) | 0 |  
  | 1924 | 873 | 2083 | (70) | 0 |  
  | 1925 | 897 | 2091 | (67) | 0 |  
  | 1926 | 906 | 2099 | (60) | 11 |  
  | 1927 | 955 | 2097 | (66) | 0 |  
  | 1928 | 966 | 2094 | (69) | 7 |  
 
Rating table notes
 | 
| Biographical data |  | 
   | Name: Kloosterboer, Gerrit Willem |  
   | Born: 23 Nov. 1878 |  
   | Died: 18 Apr. 1968 |  |  |  |  
   | References |  | 
| Books |  
   | Di Felice, Chess Results, 1901-1920, page 308 |  
   | Di Felice, Chess Results, 1921-1930, page 328 |  
   | Thulin, Name index to CTC, page 134 |  | Periodicals |  
   | [TNS], vol. 27, no. 6, 1 July 1919, page 128 |  | Web |  
   | [Gerrit Willem Kloosterboer] |  |  |