Queen of the South defeated play-off rivals Hibernian 1-0 at Easter Road on Saturday to stay just outside the top four.
Mark Durnan got the only goal early in the second half for James Fowler's side as Hibs suffered a third straight defeat.
Falkirk took advantage of a red card for Raith Rovers' Liam Fox to claim a 1-0 home win thanks to a 62nd-minute goal from Will Vaulks.
Cowdenbeath moved out of the relegation zone with a 3-0 victory against Dumbarton at Central Park with goals from Lewis Toshney, Sean Higgins and Colin Nish.
Third-placed Rangers face champions Hearts at Ibrox on Sunday, live on BT Sport with a 12.15pm kick-off.
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