What were Diamond and Shogun?
Diamond (game): Diamond is a two-player abstract strategy board game invented by Larry Back. Shogun (1986 board game):  It was renamed to Samurai Swords in its first re-release (1995) to disambiguate it from other games with the same name (in particular, "James Clavell's Shogun", a wargame with a similar theme, released in 1983), and renamed again to Ikusa in its 2011 re-release under Hasbro's Avalon Hill banner.
board game