The red button forum continues with Tanya Arnold, Brian Noble, Ashton Sims and Robbie Hunter-Paul for the next few minutes.

However, that's it from me on the live text commentary. Thanks for joining me today.

Castleford coach Daryl Powell told BBC Sport: "Wigan were really good. They started like a house on fire and we didn't handle the physicality of it. We made too many errors and they defended really well throughout the game.

"We're out of the Challenge Cup but we've got to kick on. We've got four games left to get in the Super 8s. We've got to change a few things mentality-wise, and if we do that we've got a chance "

Well, that's a tasty draw.

Super League leaders Hull FC will face the 19-times Challenge Cup winners Wigan in a repeat of the 2013 final, while this season's surprise package Wakefield will take on Warrington.

"Two cracking ties", says Brian Noble. Hard to disagree.

Both will be televised live on the BBC, and we'll have live text commentaries on the BBC Sport website and app.

Here we go then - here's the semi-final line-up....

Wigan Warriors v Hull FC

Warrington Wolves v Wakefield Trinity Wildcats

Ties to be played on 29-30 July.

So we know our four semi-finalists - we'll have details of the draw for the last four shortly.

Our red button forum has begun - click on the play button to watch online.

Wigan full-back Sam Tomkins told BBC Two: "It means a lot to us. A lot of the lads in the team have experienced this before and know exactly how it feels to be at Wembley. Second half, I think we were scrappy. We can work on that."

Wigan head coach Shaun Wane told BBC Two: "It was a good first 40 minutes. In the second half, we went off the boil a little bit. We were good for the win, though."

So it's Wigan Warriors who complete the Challenge Cup semi-final line-up.

Reaction from their victory to come, plus the draw for the last four.

The game may be gone, but credit to Castleford, who are still giving their all in the final minutes to get some more points on the board.

Just some early missed tackles by the Tigers that have been the difference in this one.

More reaction to the decision to award that Dom Manfredi try a few minutes ago...

Less than 10 minutes remaining and, barring a miraculous comeback, Wigan will join Wakefield, Warrington and Hull FC in the Challenge Cup semi-final draw - which takes place at the conclusion of this match.

It is fair to say that many of you aren't too impressed with that decision for the Dom Manfredi try...

Jonathan Davies
Former Great Britain international on BBC Two

I don't think he touched that whatsoever. How he has given that, I don't know. If the referee isn't sure, why does he have to make a decision?

Oh, almost one of those tries there. Five metres out, Junior Moors almost apologetically stops play, knowing Castleford are going to be penalised for obstruction.

Despite that try from Luke Gale, Castleford still require three converted scores to win this Challenge Cup tie. A big ask.

You may have inadvertently heard a huge scream of delight from Jonathan Davies on the BBC Two coverage - do you think he's heard that Wales have beaten Northern Ireland 1-0 to reach the last eight at Euro 2016?

Follow reaction to that match here.