Tabanus: From https://docs.google.com/viewer?a=v&...:<Three leading players in Cincinnati took up the idea of organizing an Ohio State Chess Tournament immediately after the Second American Chess
Congress of 1871 in Cleveland had ended. Mid-December 1871 they formed a
committee preparing the meeting to produce the state chess champion. The
three men were John Eggers, H.P. Belknap, Jr., and <A.P. Johnston>.>
Cincinnati Inquirer 19 Dec. 1871 has "A. P. Johnston", and
Cincinnati Daily Gazette 14 Feb. 1872 has "A. Johnston, Esq." to whom Max Judd wrote a letter asking to play in the 1872 Cincinnati tournament (where Judd won and A. P. Johnston was no. 2).
"Esq." (http://en.wikipedia.org/wiki/Esquire) would indicate someone of higher rank, in the US possibly one licensed to practise law? But I can only find an A. P. Johnston in Cincinnati 1876 with occupation "Builder", and one later (1888 onwards) who is a "Clerk".