Aberdeen ended their six-game goal drought with a 1-0 win over Kilmarnock at Pittodrie thanks to a first-half header from Callum Hendry as Killie suffered an eighth successive defeat.
Hibernian remain four points ahead of the Dons in third place after beating 10-man Hamilton Accies 2-0 at Easter Road with goals from Martin Boyle and Josh Doig.
St Johnstone were impressive 3-0 winners against Motherwell at Fir Park. Guy Melamed scored a double, one a penalty, with Jason Kerr also on target for Saints.
St Mirren and Livingston drew 1-1 at the SMISA Stadium. Livi led through a Conor McCarthy own goal early on but Cammy MacPherson equalised before the break.
In the Scottish Championship, leaders Heart of Midlothian were held to a 1-1 draw by Morton at Tynecastle, with Jamie Walker equalising after Craig McGuffie scored for the visitors.
Dunfermline Athletic are in second spot after beating bottom club Alloa Athletic 2-1 at East End Park, with Craig Wighton grabbing a double for the Pars.
In-form Queen of the South moved into the play-off places thanks to a 3-2 victory over Dundee at Dens Park, with Willie Gibson netting what proved to be the clinching goal.
Arbroath are up to sixth place as their good run continued with a 1-0 win against Raith Rovers at Gayfield, courtesy of a 60th-minute goal from Kris Doolan.
Ayr United have slipped to second from bottom after going down 2-0 to Inverness Caledonian Thistle at Somerset Park, with Shane Sutherland scoring the second goal for ICT.
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