Inverness Caledonian Thistle defeated Kilmarnock 2-1 on Friday night to secure a place in the promotion play-offs with three games to spare.
Ash Taylor gave Killie the lead on the hour mark but Billy Mckay equalised for Billy Dodds' side and Logan Chalmers grabbed the winner with eight minutes left.
Arbroath - who go to Kilmarnock next Friday - can cut the gap on the leaders to a single point when they host bottom club Queen of the South on Saturday.
