Possible Clues:

• According to ___ (by the rules)
• Game-rules authority
• Sir Fred —, astronomer
• Proverbial settler of card-table disputes
• English astrophysicist, who coined the term 'big bang', d. 2001
• Rules immortal
• Astronomers may well act according to him
• English author, expert on card games, d.1769 — English astrophysicist, d. 2001
• Posthumous inductee into the Poker Hall of Fame, 1979
• Rules writer Edmond