Wu Yize throws his head back in frustration.

His turn to open the remaining reds up, off the black, but the cue ball ends up glued to one of them.

A break of 22 before he plays safe.

Mark Allen chews gum in his seat as Wu Yize gets himself up and running with a long-ish red into the corner pocket followed by the black.

Allen ha 47 points already banked but Wu has an opportunity here.

Another cluster of reds to open up but Mark Allen does not get the luck he needs after attempting to break them up off the pink.

With no pot on he sends the cue ball up the table and invites Wu Yize into the fray.

Mark Allen has quickly regained his focus. It would have been easy to have a meltdown following that previous frame but he appears to have put it behind him.

He is milking the black nicely and his break is now up to 40.

Into the deciding frame we go.

Mark Allen has just broken up the pack and is building a break which currently stands at 17.

Steve Sutcliffe
BBC Sport at the Crucible Theatre

What have I witnessed there? I am not sure I have ever seen a frame like it.

What must Mark Allen be feeling. Can either of these two players hold themselves together for this deciding frame?

I wonder if Shaun Murphy is watching or if he is already tucked up in bed?

Errors, mistakes and pure pressure.

Mark Allen pots the pink and has a decent position on the black to book his place in the World Snooker Championship final.

He rattles the jaw. Wu Yize pots it.

WE HAVE A DECIDER.

Both players miss chances to pot the pink in the corner pocket.

The pure unadulterated tension!

All of a sudden it's like a weight is lifted off Wu Yize and he goes on knock in the remaining red and four of the colours.

The frame is his for the taking...only to rattle the pink into the jaws.

Both players cracking under the pressure here.

The pink is safe.

Dennis Taylor
1985 world champion on BBC Two

I can't believe that - that's just pure pressure.

Two reds left.

Mark Allen pots one and leaves himself with a very nervy black to cut in...but manages to pot it,

However, a bread-and-butter red that follows rattles the jaws of the pocket.

Allen's heart sinks.

Blunders galore from Wu Yize.

A shot to nothing and the cue ball ends up coming back up the table and sliding down one of the corner pockets.

Moments later he knocks the black in with a poorly judged safety shot on a red.

Dennis Taylor
1985 world champion on BBC Two

It's OK, Mark Allen has got it safe.

But he was a long way off the pot there, which is understandable.

These are huge moments in both these players' careers here, you can expect the nerves to play a huge part now.

Another twist in this frame,

Three reds left and Mark Allen rattles one into the jaws of the corner pocket. It was a tricky shot down the cushion.

Can Wu Yize put this frame to bed now. He leads 52-37.

Not straightforward at all...

Wu Yize pots the cue ball into the middle pocket attempting to pot a red into the corner. A lapse in concentration.

"Come on Mark!" bellows a voice in the crowd.