Goals from Kyle Lafferty and a Nikica Jelavic penalty gave Rangers, the SPL leaders, a 2-1 win against Aberdeen at Pittodrie.
Lafferty put the visitors ahead after 58 minutes and Jelavic's penalty doubled the lead. The hosts pulled a goal back when Allan McGregor allowed a 25-yard Ricky Foster strike to slip through his hands but had Rory Fallon sent off in added time.
Tom Hateley's late strike gave Motherwell a 3-2 win at bottom side Inverness. The deflected 25-yard free-kick with four minutes to go came after Caley Thistle's Chris Hogg was sent off.
David Davis fired the hosts into an early lead in the third minute before Shaun Hutchinson equalised. Andrew Shinnie put Inverness back in front after 76 minutes but Keith Lasley lashed in an equaliser 60 seconds later and Hateley added the winner.
Kenny McLean scored his first goal for St Mirren as they scraped a 1-0 victory over St Johnstone.
Kilmarnock secured a controversial 1-0 win against Hearts at Tynecastle. Ian Black was sent off after 16 minutes for the home side before Dean Shiels converted a 55th-minute penalty after Marius Zaliukas was belatedly ruled to have fouled Kilmarnock's Paul Heffernan.
Dundee United won 4-1 against 10-man Dunfermline at East End Park.
