Liam Watts held up under the posts! Hull go for broke to the left and then on the last Jamie Shaul forces a drop out.

Leeds run it behind with Danny McGuire. More pressure to come.

What a dramatic finish we could be in for now.

Leeds making progress but then cough up possession with an obstruction penalty. Gives Hull chance to strike. Next try is massive.

Hull have targeted Tom Briscoe with high kicks this afternoon - it paid off earlier in the half as Carlos Tuimavave scored his second try and extended the lead for his side.

Marc Sneyd and company are giving a perfect display of how to manage a game. Leeds forced back to their own 10 metres from the Hull half's booming kick to touch.

It's first rate game management.

Carlos Tuimavave is a half playing in the centres and that kick there was evidence of his talents. Drilled into the corner to frustrate Leeds and give Hull a breather.

Hull have some excellent pivots throughout the squad, especially with Jake Connor on the bench.

Leeds meanwhile going forward with purpose. Watch this space...

You can see why the Hull fans have forgiven Albert Kelly for his days at their neighbours on the other side of the city.

You can see Kelly's fantastic assist for Chris Green's try here...

Marc Sneyd just tips one through the uprights to push the gap to three converted scores.

Hull FC had a good few bashes on the Leeds line before taking the one-pointer.

Their fans have their voice right now. Leeds need to act quickly.

Hull really mixing up their play around the ruck and at the line. Out the back, switch, flat-pass. Leeds are always thinking.

Leeds concede a penalty for impeding on a high kick, blocking off Fetuli Talanoa.

Danny McGuire gets his head bandaged. There's no way you'll drag him off this field.

His side are battling for field position at the moment. Their last tackle play comes up with a Hull penalty. Not happening for the Rhinos at the moment. Plenty of effort but no reward.

Almost a piece of Danny McGuire magic to put Tom Briscoe in for Leeds.

Goes through into space and tries to nudge one to his winger. Just too much on it.

They'll need his mastery to overcome this deficit.

Can anyone stop Hull from retaining the Challenge Cup? Leeds have been rushed either side of half-time by the Black and Whites.

They're finding space and getting go-forward. Danny Houghton growing in influence. Leeds look shellshocked.

Brian Noble
Ex-Great Britain coach on BBC One

"They have bombed that. What a fantastic passage of play until the end.

"Like this game, it had everything."

What a waste from Hull!

Albert Kelly put Josh Griffin away down the right and chipped in-field. Jamie Shaul picked up the pieces, fizzed to the left and Marc Sneyd went to find Fetuli Talanoa but the ball went to touch.

Decision making the issue there.

Huuuuuuuuge let-off for Leeds.

Danny McGuire drills a kick in behind on the last to turn Hull FC around back in their own 10.

Territory play from Leeds.

Hull to get us underway for the second-half. Ball goes into the Leeds half.

They will bring the ball away.

So, what of the next 40 minutes to come of the Challenge Cup semi-final?

Hull's big pack need to stick to their task and we all know Marc Sneyd will keep attacking that Leeds right edge.

Leeds have to keep their calm, they're one converted score behind.

It's all to play for.

Tomorrow's semi-final brings two Lancashire clubs together in Salford and Wigan at Warrington's Halliwell Jones Stadium.

It also splits a family too.

Meet Sam, Joel and Logan Tomkins as the brothers prepare for Sunday's Challenge Cup semi-final between Wigan and Salford.

Albert Kelly has been very influential for Hull in this half.

Here he is earlier fooling the Leeds defence and going over for the Black and Whites first try of the afternoon.