The leading trio in the Championship are now separated by just two points with two games remaining.
Dundee were knocked off top spot after losing 1-0 at bottom club Morton, with Dougie Imrie grabbing the only goal in 78 minutes.
Hamilton Accies hold a one-point advantage at the summit following a 2-1 home win over Alloa. Jason Scotland and Andy Ryan were on target before Ross Caldwell pulled one back.
Falkirk are firmly in title contention after beating Raith Rovers 2-1 with goals from Rory Loy and Conor McGrandles. A Will Vaulks own goal reduced the deficit before the break.
Queen of the South took a big step towards the play-offs with a 3-0 victory at Dumbarton. Iain Russell, Derek Lyle and Kevin Holt got the goals for Jim McIntyre's team.
Cowdenbeath still have hopes of avoiding the relegation play-off thanks to a 4-0 home win over Livingston. John Armstrong and Kane Hemmings both weighed in with doubles at Central Park.
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