Halifax give away a penalty on the last tackle.

Bradford kick up to 25 metres out from the Fax line.

The Bulls are stopped just short on the final tackle.

Almost into the final quarter, and only one score separates these two Championship clubs.

There is plenty of time left for Halifax to turn this one around again as the two sides start to tire.

Brian Noble
Ex-Great Britain coach on BBC Two

That's a lesson for anyone playing this game. Don't give up on anything.

Jake Webster thinks he has put Bradford back ahead.

But we go to the video referee again...

Brian Noble
Ex-Great Britain coach on BBC Two

Halifax have got the bit between their teeth. They're looking energised and enthusiastic and Bradford need to hold their nerve over these next five minutes.

Incredible from Steve Tyrer, who slips a couple of tackles and gets to within inches of the Bulls line before being halted.

A kick goes into the Bradford in-goal area on the last, but the ball bobbles out and goes dead.

In the meantime, an allegation of biting on Halifax's Dan Fleming has gone on report.

And in a flash, Halifax are ahead and have the momentum.

Now they win a penalty 30 metres out from the Bradford line and have a chance to attack.

Image source, Getty Images

Jonathan Davies
Former Wales international on BBC Two

Well, that's a turnaround. It's gone a bit flat in Odsal now.

Scott Murrell puts a high kick into the Bulls in-goal area and Fax could have a try here...

Steve Tyrer looked to have got the ball down in front of a Bradford defender.

We go to the television match official Chris Kendall.

Both sides are keeping it tight in the early stages of the second half.

Halifax have the ball 15 metres from their own line as they start a set.

Bradford head coach John Kear tells BBC Two's Damian Johnson that Rowan Milnes has broken a bone in his leg during that first half.

He's expected to be out for around six weeks.

Bradford get the second half started. The Bulls are 40 minutes away from the last four.

Can Halifax find a way back into the game? They put the Bulls under pressure in the first half but could not find a way to the hosts' line.

Scott Murrell was at the heart of all of Fax's attacking play, but his passes and kicks failed to unlock the Bradford defence.

Remember, the draw for the semi-finals takes place on BBC Two after full-time.

These two sides both have Challenge Cup pedigree.

Both have won the competition five times.

Bradford last triumphed in 2003, against Leeds, while Halifax last won the trophy in 1987.

One of these clubs will be the sole Championship representative in the last four.

Here are the half-time stats from Odsal.

Image source, BBC Sport

Here is the one try we have had so far at Odsal.

Rowan Milnes started the move for Bradford and finished it as well.

Bradford are on course for the last four of the Challenge Cup for the first time since 2007.

Jonathan Davies
Former Wales international on BBC Two

There's nothing in it. Defensively, they've both been solid and you can't really see where the attacking threat is going to break the defence down.

Everything to play for, they know each other so well, but in the second half the slope will be with Halifax.

Halifax can't make the most of the late opportunity, as Connor Farrell falls on a chipped kick over the top and makes sure the ball goes dead.

Bradford have the advantage at the break.