Dundee lost ground to Queen’s Park at the top of the cinch Championship with a 3-1 defeat to Partick Thistle.
Brian Graham got the first goal of the game three minutes before the break when he finished past Adam Legzdins from close range to make it 1-0.
The visitors doubled their advantage 15 minutes from the end through Graham’s second of the evening when he nodded home from a corner.
Dundee found a route back into the game with 10 minutes to go when Ben Williamson’s cross was fired in by Jordan McGhee.
Any threat of a Dundee fightback was quashed more or less straight away as Thistle got their third a minute later when Scott Tiffoney raced through on goal and tucked home to secure all three points.