Hearts stay nine points clear in the Championship after beating Queen of the South 4-1 at Tynecastle on Saturday.
James Keatings' opener was cancelled out by Iain Russell's penalty but Danny Wilson, Prince Buaben and Adam Eckersley ensured an empathic win for the leaders.
Dean Shiels got the only goal just before the hour mark as second-placed Rangers defeated Cowdenbeath 1-0 at Ibrox.
David McCracken struck in stoppage time as Falkirk beat Hibernian 1-0 at the Falkirk Stadium to move to within two points of the play-offs.
Bottom club Livingston took full advantage of Ross Perry's early red card to run out 5-1 winners against Raith Rovers at Stark's Park. Jordan White (penalty), Mark Burchill, Gary Glen, Danny Mullen and Michael McKenna netted for Livi, with Grant Anderson on target for Raith.
On-loan St Johnstone striker Chris Kane's early goal proved decisive as Dumbarton edged out Alloa 1-0 at the Indodrill Stadium.
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