Heart of Midlothian remain six points clear at the top of the William Hill Premiership table after beating St Mirren 2-0 at Tynecastle on Wednesday evening.
Derek McInnes' side had Beni Baningime sent off after just 15 minutes but second-half goals from Lawrence Shankland and Tomas Magnusson secured a vital win.
Celtic moved into second place with a 1-0 victory at the Falkirk Stadium. The Bairns paid the price for missing some good chances before Benjamin Nygren headed in a 43rd-minute corner.