Rangers took a massive step towards the Clydesdale Bank Premier League title when they clinched victory in the final Old Firm derby of the season.
Steven Davis proved to be the difference between the two teams when he grabbed the only goal of the game at Ibrox.
The victory could prove pivotal in the title race as Rangers move two points ahead of Celtic into pole position with just three games remaining.
Kevin Kyle kept Falkirk bottom of the table as he again proved his worth to Kilmarnock with a crucial equaliser in today's 1-1 draw at Rugby Park.
The Bairns were outplayed in the first half but Darren Barr headed them in front 11 minutes after the break.
The visitors looked set to climb off the foot of the table but goalkeeper Dani Mallo let Kyle's 20-yard strike squirm through his hands midway through the second half.
Falkirk did cut the deficit at the bottom to two points, while Killie remain embroiled in an intriguing relegation battle.
St Mirren stayed second bottom after losing 3-1 at home to Motherwell.
Teenager Jamie Murphy opened the scoring for the visitors with a 13th-minute header and David Clarkson then contributed a goal in each half for Well.
Substitute Stephen O'Donnell, making his comeback from injury, sparked a late rally when he scored with a fine volley, but it proved a mere consolation as the Paisley side remained mired in the relegation fight.