Tabanus: "A. G. Howard, Esq." was a member of the St. James's Chess Club in Regent Street. Here's a plausible candidate:1851 census 1.A. Charlwood Place, Pimlico, Westminster: Alfred G. Howard, 26, Solicitor, born in Kenning Surrey (= in Lambeth). Ellen, 24, Wife. Alfred, 10 Mo(nths), Son. Emma, 23, Housemaid.
1858: Alfred George Howard, 21 Denbigh-place (London Electoral Registers 1858)
1861 census: not found.
1861: <Births. ... On the 9th inst., at 21, Denbigh-place, Belgrave-road, the wife of Alfred George Howard, Esq., solicitor, of a son.> (Morning Post 12 April 1861 p. 8)
1864: Alfred George Howard, 21 Denbigh-place (London Electoral Registers 1864)
1871 census 21 Denbigh Place, St George Hanover Square, Westminster: Alfred Geo Howard, 46, Widower, Solicitor, born in Lambeth Surrey. Children: Alice Ellen 19, Laura 17, Walter 14, Horace Fred 9, Vivian 7.
1881 census 43 Bellefield Road, Lambeth: Alfred Geo Howard, 56, Widower, Solicitor, born in Lambeth Surrey. Children Alice Ellen 29, Horace 19, Vivian 17.
1891 census 99 Howson Road, Lewisham: Alf. Geo Howard, 66, Widower, Solicitors Clerk Law, born in Lambeth Surrey. Children Alice 39, Horace F. 29, Postman, Vivian 27.
1901 census 12 Parkstone Road, Camberwell: Alfred G Howard, 76, Widower, Retired Solicitor, born in Kennington (Lambeth). Horace F, 39, Son, Postman.
1909: Alfred George Howard, 84, died Jan-Feb-Mar 1909 in Camberwell (death index). Buried 10 Feb 1909 (London burials)
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In July 1862 he was 37 years old and married to Ellen (1826-1868). Living with four small children about 1-2 km from the St. James's club.