Listen to Sportsound post-match coverage
FT: Hibernian 1-2 Celtic - Idah nets early penalty on first start then scores late spot-kick after Levitt smashes in second-half equaliser
FT: St Mirren 2-0 Dundee - Mandron drills in opener & hosts' Bolton sent off before Olusanya adds second
FT: Kilmarnock 1-0 Livingston - Watkins nets late on from Van Veen knockdown
FT: St Johnstone 0-1 Hearts - Shankland latches on to Kent pass and finishes with aplomb
Derek Adams resigns after 12 games of third spell as Ross County manager
Hibernian 0-1 Celtic
Tony Ralston, what a ping of a pass into the path of Adam Idah, but the striker just can't get it under his control.
That's the same problem for Daizen Maeda seconds later, with his first touch badly letting him down after sneaking in at the back post.
St Johnstone 0-0 Hearts
Image source, SNSHearts manager Steven Naismith embraces his old manager Craig Levein
Kilmarnock 0-0 Livingston
Kheredine Idessane
BBC Scotland at Rugby Park
I think David Martindale wants a game. He's so far out of his technical area, he's nearly on the pitch.
Along trots the fourth official to give him a wee ticking off and usher him reluctantly back behind the dotted lines.
His side have started well, though, he's happy enough. Derek McInnes is less impressed, wanting more composure on the ball from his team.
Image source, SNSSt Johnstone 0-0 Hearts
Tyrone Smith
BBC Sport Scotland at McDiarmid Park
St Johnstone are finally managing to get their foot on the ball a bit more, finding their way a bit further up the park.
For all the visitors' dominance, the final piece of the jigsaw, that cutting edge up top, has been missing so far.
But this is a Hearts team that have been banging in the goals of late, and one which boasts Lawrence Shankland, so Steven Naismith will be confident that cutting edge will reappear soon.
St Mirren 0-0 Dundee
And we're off in Paisley.
Four games, three different kick-off times.
Kilmarnock 0-0 Livingston
Kheredine Idessane
BBC Scotland at Rugby Park
I think Livingston will be pretty happy with their opening 20 minutes or so.
They've settled into the game well enough and limited Killie to precious few opportunities.
The Lions had a decent one themselves from a free-kick just outside the box. Michael Nottingham headed weakly into Will Dennis' arms when he ought to have been troubling the home keeper.
St Johnstone 0-0 Hearts
Stephen Kingsley tests St Johnstone goalkeeper Dimitar Mitov at his near post, but it's a comfortable save.
Kilmarnock 0-0 Livingston
David Carson has just had a shot that's spun out for a Kilmarnock throw-in.
Quite impressive how bad that was.
Kilmarnock 0-0 Livingston
Michael Nottingham gets on the end of a Livingston set-piece but heads straight at Will Dennis.
Decent chance, that.
Adam Idah (pen)
As cool as you like from Adam Idah. Not a bad way to mark your first Celtic start.
The striker sends David Marshall the wrong way with a powerful penalty kick.
Hibernian 0-0 Celtic
John Collins
Former Hibernian manager on BBC Sportsound
No doubt it wasn't meant, but he has caught him badly.
Hibernian 0-0 Celtic
There doesn't seem to be any VAR intervention at Easter Road.
That nasty head knock for Alistair Johnston has won his side a penalty but he's going to have to make way on a stretcher.
Kilmarnock 0-0 Livingston
Kheredine Idessane
BBC Scotland at Rugby Park
Greg Stewart appears to take one flush in the chest from his own side.
Tom Davies' fine volley from the edge of the area following a corner was hit like a rocket.
That stings extra badly on a cold night like this. Stewart looked momentarily dazed but is fine to continue.
St Johnstone 0-0 Hearts
Tyrone Smith
BBC Sport Scotland at McDiarmid Park
An early booking for St Johnstone's Luke Robinson for a challenge on Kenneth Vargas.
It could now be a long night for Robinson, he will certainly need to be very careful given the way Hearts are continuing to completely dominate this game.
Hibernian 0-0 Celtic
A head knock in the box... is it enough to be a penalty, though? Nick Walsh says yes.
Nectarios Triantis has clashed with Alistair Johnston, who is in quite a bit of pain, and Anthony Ralston will replace him. A stretcher is on.
Hibernian 0-0 Celtic
Hibernian didn't touch the ball in the first two minutes, held on to it for 10 seconds, and then conceded a corner.
Could be a long night at that rate for the home side...
Kilmarnock 0-0 Livingston
Tete Yengi has just made a mess of a massive chance.
The Livi striker is clean through on goal, but the ball somehow bounces away off his heel and Killie get players back.
Away we go at Easter Road.
Three of the four games under way.
St Mirren v Dundee (20:15)
Martin Dowden
BBC Sport Scotland at SMiSA Stadium
Hopefully in this case.
I'm not sure there was absolute consensus on this delay to kick-off given the murmurs I heard around the tunnel area, but both teams will just have to get on with it now.
On the park, these sides have a lot to be positive about. A win for either begins to add significant gloss to already productive campaigns.
St Johnstone 0-0 Hearts
Hearts are screaming for a penalty here.
Alan Forrest's cross is blocked by Andy Considine. It does look like it's hit the Saints defender's arm.
But they were firmly by his side.
A quick VAR check and on we go.