found: Test tube chess, 1972:title page (A. J. Roycroft)
found: Hugh Blandford, c1998:t.p. (A. John Roycroft) p. 1 (John Roycroft)
found: Stinking bishops, 2014:title page (John Roycroft)
found: Wikipedia, viewed September 5, 2017John Roycroft (Arthur John Roycroft (born 25 July 1929, London) is an English chess endgame study composer and author. In 1959 he was awarded the title International Judge of Chess Compositions. In 1965 he founded EG, the first long-running journal exclusively for endgame studies. Roycroft served as editor and publisher through 1991. Roycroft worked for IBM UK from 1961 until early retirement in 1987. Lives in northwest London.)
found: Richard Guy's chess endgame studies, 1996:t.p. (John Roycroft)
