| Ratings 
 
 
  | Year | Rank | Edo | Dev. | Games |  
  | 1923 | 1479 | 1712 | (132) | 8 |  
 
Rating table notes
 | 
| Biographical data |  | 
   | Name: Köster |  
   | Born: |  
   | Died: |  |  |  
   | Notes: |  
   | Gaige and Di Felice have 'Kösten'; McGowan has 'Köster'. |  |  |  |  
   | References |  | 
| Books |  
   | Di Felice, Chess Results, 1921-1930, page 51 |  
   | Gaige, Chess Tournament Crosstables IV, page 585 |  
   | McGowan, Kurt Richter, page 18 |  |  |