Joe Ledley scored the only goal as ten-man Celtic maintained their four-point lead at the top of the Scottish Premier League with victory over Inverness. The Welsh midfielder converted a James Forrest cross after 16 minutes from close range to extend the Hoops\' domestic winning run to an impressive 17 games. Celtic defender Daniel Majstorovic was shown a straight red card on the hour mark before Caley defender Steve Williams was sent off in the 77th minute for picking up a second yellow card for a foul on Georgios Samaras. With Celtic bagging another three points, Rangers remained at arm\'s length after their 4-1 win at bottom club Dunfermline. Makeshift striker Lee McCulloch scored his first goal of the season after David Healy cancelled out Andy Kirk\'s shock opener. Sone Aluko and Salim Kerkar added a goal apiece in the second half. Dunfermline\'s defeat allowed Hibernian to move a point clear of them with a goalless draw at home with Aberdeen. A pair of own goals from St Johnstone and an incredible three goals in the final seven minutes gave Dundee United a stunning 5-1 Tayside derby win. St Johnstone fell behind just before half-time when Steven Anderson bundled into his own net following a dreadful blunder by goalkeeper Peter Enckelman. A second own goal on the hour mark, from Callum Davidson, doubled United\'s lead before Anderson made amends for his unfortunate strike by pulling a goal back. However, headers from Johnny Russell and Jon Daly ensured the Tannadice side would finish worthy victors. Enckelman produced another howler in injury-time as his attempted clearance struck team-mate Dave Mackay to allow substitute Milos Lacny to roll a fifth into the unguarded net. Suso Santana\'s injury-time equaliser earned Hearts a 1-1 draw with Kilmarnock after Paul Heffernan had bundled home ten minutes from time. Both sides finished the game with ten men after Dieter van Tornhout and Jamie Hammill were both given their marching orders in the second half. And finally, third-placed Motherwell had to be content with a goalless draw at St Mirren.