Rangers could win the title at Parkhead on March 21 as Celtic's nightmare 10 In A Row scenario becomes ever more of a reality.
The Premiership champions came from behind to secure a 2-1 victory at St Johnstone, with Odsonne Edouard's double making it four wins on the spin.
The result may have a sting in the tail though as, with an 18 point gap it means the title could be decided in the third derby of the season.
With 10 games remaining Celtic are on 61 points, and it doesn't take a mathematical genius to work out their maximum possible total is 91.
With Rangers on 79 they need 12 points, or four wins to match that total.
But after fixtures against Dundee United, Livingston and St Mirren they meet Celtic on their own patch.
Should they win all three of those fixtures, a victory at Parkhead would put them on 91 and ensure Neil Lennon's side couldn't catch them.
That's not the only scenario that could see it won at Celtic Park though.
If Celtic draw their game in hand against Aberdeen, or any of their other fixtures before Rangers, their maximum possible points total would be 89.
Should Rangers win their three games they'd go in to the game on 88 and a draw would be enough to win the league.
