| Ratings 
 
 
  | Year | Rank | Edo | Dev. | Games |  
  | 1865 | 423 | 1674 | (178) | 3 |  
  | 1866 | 465 | 1669 | (177) | 0 |  
  | 1867 | 449 | 1664 | (176) | 0 |  
  | 1868 | 472 | 1659 | (175) | 0 |  
  | 1869 | 479 | 1654 | (173) | 0 |  
  | 1870 | 551 | 1649 | (172) | 0 |  
  | 1871 | 596 | 1643 | (171) | 3 |  
 
Rating table notes
 | 
| Biographical data |  | 
   | Name: Mitchell, William Wallace |  
   | Born: 16 Sep. 1803 |  
   | Died: 2 Nov. 1884 |  |  |  
   | Notes: |  
   | Full name, birth and death dates from official records, sent to me by Alan McGowan. |  |  |  |  
   | References |  | 
| Books |  
   | Gaige, Chess Personalia, page 285 |  | Periodicals |  
   | [CPC], vol. 13, no. 3, Mar. 1852, page 85 |  
   | [CPC], vol. 1, no. 3, Mar. 1853, page 78, 92 |  
   | [CPQC], vol. 1, no. 4, Nov. 1868, page 122 |  
   | [Era], vol. 34, no. 1725, 15 Oct. 1871, page 7 |  
   | [ILN], vol. 58, no. 1653, 3 June 1871, page 555 |  
   | [ILN], vol. 59, no. 1674, 14 Oct. 1871, page 363 |  
   | [ILN], vol. 61, no. 1727, 12 Oct. 1872, page 359 |  
   | [ILN], vol. 62, no. 1759, 17 May 1873, page 475 |  
   | [WP], vol. 4, no. 2, 1 June 1871, page 19 |  
   | [WP], vol. 7, no. 2, 1 June 1874, page 19 |  |  |