Andruet was a member of the French team at the 1982, 1984 and 1988 Chess Olympiad. In 1988 he won the French Chess Championship and reached his peak Elo rating (2450). During the 1989 Championship, Andruet was involved in a violent altercation with Jean-Luc Seret and subsequently withdrew from the tournament despite the fact that he was in the lead after 10 of 14 rounds. He played less regularly after 1991.