It is the longest frame of the match so far and the clock ticks past the 35-minute mark. O'Sullivan leads 58-52, with the colours remaining.

Image source, Getty Images

Television presenter Melanie Sykes on Twitter:, external I used to watch it (the snooker) on a black & white telly in my mum & dad's room because no one wanted to watch on the colour one in the lounge!

We are still going on in the 23rd frame. Selby's lead is now two points, 48-46. Wait, make that 50-48 to O'Sullivan after Selby fails to escape a snooker and hit the yellow.

Image source, Getty Images

This is the sixth time in World Snooker Championship history that the final has been tied at 11-11. The other occasions were Alex Higgins-Cliff Thorburn (1980), Steve Davis-Dennis Taylor (1985), Stephen Hendry-Jimmy White (1994), Ken Doherty-Mark Williams (2003) and Shaun Murphy-Matthew Stevens (2005).

George Riley
BBC Radio 5 live at the Crucible

Image source, George Riley

"Can't remember the media centre being this busy at the Crucible. Huge interest in this final #bbcsnooker"

Selby held a 25-0 lead before O'Sullivan blew an opportunity when going in off. With all six remaining reds tight on the top cushion, this 23rd frame is going to take some sorting out.

Dennis Taylor, 1985 world champion, says: "The fact that Ronnie has won his first frame after six in a row is massive. Maybe things have swung around again.

"It is anybody's final at the moment. It doesn't make Ronnie favourite, but the fact Mark didn't capitalise on a couple of chances, it perhaps has given him the boost he needed."

John Parrott
Former world champion on BBC TV

"The fifty break O'Sullivan made was great but there was a lot of theatre after that."

Stephen Hendry
Seven-time world champion on BBC TV

"I just feel Mark Selby has missed a great chance. If he had gone two frames in front, Ronnie's head could really have gone."

Both players had chances to win the 22nd frame, but O'Sullivan takes his first frame of the day. Now we are tied at 11-11.

Ronnie O'Sullivan 11-11 Mark Selby (77-38, O'Sullivan 50 break)

Image source, Getty Images

"This is a massive frame. To get this frame is huge for both players. If Ronnie loses the frame after missing the simple yellow, Mark will take some stopping.

"They are both making mistakes but that was really easy. They are both losing it mentally at the moment. They have missed more shots in the last five minutes than they have in the whole match."

John Virgo
BBC Sport snooker commentator

"This is the World Championship final. Remember that and take nothing for granted. It's just amazing."

We are seeing some surprising twitches from both players in this frame. Both missed the yellow, now both have missed the green.

Rachel J:, external Whatever Ronnie's psychologist [Steve Peters] said to him in the mid-session interval seems to have worked.

Man in the Pub - Mike:, external This has all the makings to become one of the great world championship finals of all time -and it genuinely could go either way.

Ryan Peteranna:, external This final is actually really close, I've no idea which way it's going to go.

What do you need to do when your opponent is on a roll?

Dennis Taylor, winner of the world title in 1985, says: "You have to forget what your opponent is doing. I wouldn't watch what my opponent was doing and just try to get myself mentally ready for what was required when I got my chance.

"I used to sit in my chair and just think about some of my great games and just think really positively. I think snooker is the toughest sport mentally.

"I play golf and I know how difficult it is, but when your opponent is knocking in balls, there is nothing you can do about it in snooker, while in golf you always have the chance to hit a good shot."

John Virgo
BBC Sport snooker commentator

"They are all big frames but you get the impression this is a massive one now, especially for Ronnie who will feel he should already have won it."

There may be only about 1,000 people in the Crucible, but there is a huge gasp from the crowd as O'Sullivan fails to cut a red into a corner pocket.

O'Sullivan had scored 50 but his failure to dispose of the last red on the table could prove costly.

1985 world champion Dennis Taylor says: "I think that Ronnie needs to get a chance to spend some time at the table - Mark Selby is playing such tight and tough snooker.

"O'Sullivan has just spent some time with Steve Peters and this is the biggest test Ronnie has faced for a while, so it will be interesting to see how he copes mentally.

"If Ronnie wins this frame, he can change things right around, and it will give him real confidence. To restore his self-belief he needs this one.

"If Mark was to lose this frame he would still be in a strong position, so it is much important for Ronnie to win this frame."

Ken Doherty
Former world champion on BBC Radio 5 live

"Selby has just hung in there, he's never thrown in the towel even when people did not give him a prayer. The last two frames last night gave him confidence and he has started like a train.

"These are worrying times for Ronnie O'Sullivan. But it will take a lot of effort to keep Ronnie at bay."

Selby makes a 36 but then hits a brick wall. O'Sullivan creates a chance and is at the table as we speak, well, write.