High Quality Content by WIKIPEDIA articles! Duncan Suttles (born 21 December 1945) is an International Grandmaster of chess who was the strongest Canadian player between the eras of Abe Yanofsky and Kevin Spraggett. He is one of the few over-the-board grandmasters who also holds the title of Grandmaster of Correspondence Chess. Suttles has been inactive in over-the-board play since the mid-1980s. He currently serves with the software firm Magnetar Games, as President and Chief Technologist.