Stephen Hendry
Seven-time world champion on BBC Two

That century break from Selby was cold, calculating and clinical. That's how you take advantage of an opponent's mistake. And what a time to get your first century of the match.

John Parrott
1991 world champion on BBC Two

Mark Selby's game means he will win a lot more titles. His temperament is probably his strongest asset. He's incredibly hard to play against and incredibly hard to beat.

Selby's best break of the tournament takes him two away from the titlepublished at 20:47 Greenwich Mean Time 4 December 2016

20:47 GMT 4 December 2016

Frame 13: Selby 8-5 O'Sullivan (Selby break of 137)

The interval may have come at the worst time for Ronnie O'Sullivan. He had won three on the spin but the time away from the table has given Mark Selby a chance to regroup.

And that is what he has done with his first century of the match. He took advantage of that O'Sullivan missed red and built a perfect 137 clearance, the best break of the match.

It is not just the highest break of the match, it is Selby's best effort of the competition. A run of 120 was his previous best.

Ryan Finnigan: I don't subsidise mediocrity" from Barry Hearn sounds a lot like "I don't respect all players" to me. 

Sean: You can't pay players for losing in the 1st round. Only reward someone for winning a match. Don't reward failure.128 is too many.

Rex Banner: Getting very worried, find myself agreeing with Barry Hearn. Excellent little piece by the way.

Lee: Good idea from Selby about an A and B tour.

Which way will this match swing next? In case you have just joined us this is what has happened so far...

• O'Sullivan won the first frame with a break of 124, and then held a 2-1 lead but missed a chance to make it 3-1.
• Selby won six frames in a row to go 7-2 ahead.
• O'Sullivan fought back and took the last three frames, including a 134 clearance in the last.

We are back in match action, so let's just have a quick look back at O'Sullivan's break of 134 in the last frame.

Ronnie O'Sullivan has a unique take on the situation of discussing whether first round losers should get paid at events.

He thinks a lot of the players should not even be there to start with. He says: "I look at what's coming through and I think 'I was better than them when I was 11.

"When I turned pro, I was ready whereas these players coming through aren't ready to mix it with the real class players." 

Watch some more of O'Sullivan's interview below.

Some contrasting views from some of the game's players.

Mark Allen: "There's so many people going broke in this game, something needs doing about it. Three quarters of the tour are losing money every event. First and probably second round losers are down money."

Fergal O'Brien: "Before I hit a ball, my expenses are £30,000 every year. You'd have to win a lot of matches to earn £30,000 to just make you even." 

Shaun Murphy: "It's a hard, brutal single player sport where if you win, the rewards are there but if you lose first round, you better go back and practice because it is that brutal." 

World Snooker chairman Barry Hearn says: "There's no such thing as a minimum wage in competitive sport.

"Minimum wage is someone who works for a set amount every day. Professional sportsman choose to follow their dreams."

There has just been a fascinating debate on BBC Two with a number of players and World Snooker chairman Barry Hearn discussing finances in the game, and whether first round losers should get money.

At the moment, if you don't win, you don't get paid.

If you want to watch the clip, click at the play button at the top of this page, and then scroll back a few minutes.

Ronnie O'Sullivan has won the last three frames, with shots like this one, you can see why.

Christian: If anyone can pull this back it's @ronnieo147, external

Steve Dixon: Hope O'Sullivan can fight back come on you're the man to do it!

Gary: Some great snooker on display here from the rocket Ronnie O'Sullivan

Bethan: Ronnie fights back. Pure box office. #baizeofglory, external

Where have Mark Selby's fans gone? It looks like you're all hoping for a long match? Tweet us who you are routing for at #bbcsnooker

Some stats for you after that O'Sullivan century. That is the 850th century break of his career. Yes, you read that correctly.

It is also the 99th century that O'Sullivan has ever made at the UK Championship, and it is also the 101st century of this competition.

Stats fans, you are welcome. Happy to help.

Century break for O'Sullivanpublished at 20:11 Greenwich Mean Time 4 December 2016

20:11 GMT 4 December 2016

Frame 12: Selby 7-5 O'Sullivan (0-134, O'Sullivan 134)

It all looked so promising for Mark Selby, now the alarm bells are ringing, and they are getting louder.

O'Sullivan is in fine form in the 12th frame, with the crowd loving every shot as he rattles in a superb 134 clearance, the highest break of the match.

"He has got his mojo back, we have a match on," says BBC commentator Ken Dohetry.

Indeed we do, Ken. Indeed we do.

O'Sullivan you tease. He has lulled us all into thinking he was out of the game, then starts producing some magic. A tricky red, with hampered cueing, into the middle helps him build a break of 43, and he is still there.

John Parrott
1991 world champion on BBC Two

This is a huge frame coming up now. I'm just wondering if that missed pink from Selby has given him a long night. This is huge. 

If Selby does not win this match, then he may have nightmares about the 11th frame.

A missed pink into the middle pocket is the crucial error and O'Sullivan steals the frame by 50-36. We said it was not over, it certainly isn't. Get comfortable, we're all in for a long night.

But wait just a minute, Selby misses when he should have wrapped up the frame, there are a few cheers of 'Come on Ronnie' from the crowd and this frame is back in the balance.