| Ratings 
 
 
  | Year | Rank | Edo | Dev. | Games |  
  | 1902 | 510 | 2109 | (57) | 13 |  
  | 1903 | 523 | 2104 | (57) | 0 |  
  | 1904 | 554 | 2100 | (51) | 10 |  
  | 1905 | 561 | 2102 | (50) | 16 |  
  | 1906 | 583 | 2091 | (61) | 0 |  
  | 1907 | 620 | 2079 | (68) | 0 |  
  | 1908 | 670 | 2067 | (72) | 0 |  
  | 1909 | 739 | 2056 | (73) | 0 |  
  | 1910 | 762 | 2044 | (72) | 9 |  
 
Rating table notes
 | 
| Biographical data |  | 
   | Name: Kerwel, D. |  | Also known as: Kramer |  
   | Born: |  
   | Died: |  |  |  
   | Notes: |  
   | The Barmen 1905 tournament book (pp. 534, 618) indicates that D. Kerwel of Hannover used the name 'Kramer' in that tournament. |  |  |  |  
   | References |  | 
| Books |  
   | Di Felice, Chess Results, 1901-1920, page 308 |  
   | Malthan, Schellenberg and et al., Schachkongress des Barmer Schachvereins 1905, page 534, 618 |  
   | Thulin, Name index to CTC, page 131 |  | Periodicals |  
   | [DSZ], vol. 60, no. 9, Sep. 1905, page 260 |  |  |