GLASGOW, Jan 2 (Reuters) - Barry Robson scored a hat-trick to help Dundee United to a 4-1 Scottish Premier League win over Hearts, who finished the game with eight players on Wednesday.United took the lead after 23 minutes when Robson moved on to a short free kick from Lee Wilkie and crashed a rising shot from 20 metres into the net. Hearts equalised when Christophe Berra steered home a back post shot eight minutes from the interval. Robson made it 2-1 with a 70th minute-penalty after Lithuanian Marius Zaliukas was sent off for the foul. Noel Hunt hit their third. Robson was brought down by Lee Wallace for another spot kick on 88 minutes. Wallace was dismissed for denying a goal scoring opportunity and Robson rammed in the penalty for 4-1. Referee Alan Freeland also sent off Michael Stewart in the final minute. Kilmarnock lost 1-0 at home to Falkirk with Carl Finigan netting the first-half winner. Kilmarnock had Frazer Wright sent off while Falkirk had keeper Tim Krul dismissed. Aberdeen beat Inverness Caledonian Thistle 1-0 with a first-half penalty from captain Barry Nicholson. Champions Celtic, who top the SPL standings on 43 points from 20 games, had their Glasgow derby with rivals Rangers postponed as a mark of respect following the death of former midfielder Phil O'Donnell. The Motherwell captain collapsed on the pitch against Dundee United last weekend and died of heart failure. Motherwell had their match with Hibernian called off and Gretna, who share a ground witht Motherwell, also had their home clash with St Mirren postponed.