Rhiannion Marshall goes for the big up-and-under kick as York reach the last tackle 40 metres out.

Saints full-back Beri Salihi chooses to allow it to bounce and it bounds out of play behind the in-goal area.

A 20-metre restart for the holders, who have won the Challenge Cup in each of the past three seasons.

Saints are awarded a penalty in the middle of the pitch but can't take advantage of it, knocking on as they were working their way up the field.

That can help York gather a bit of composure now.

They have some points on the board, they have a chance to regain possession. Let's see them go again.

York get a penalty 20 metres out in front of the posts and they opt to kick the two points, which Rhiannion Marshall does with ease.

What do York have left in response?

As mentioned before kick-off, their squad has been dealing with a sickness bug during the build-up to this semi-final.

The carrot of a potential trip to Wembley will ensure every player wrings out every drop of energy that they have left.

Wow. The pressure that Saints have put on, we saw in the first half when they have good ball they can break the York defence, and they have done exactly the same there.

The error came from York and has ended up with just desserts for St Helens.

In attack I think Saints have been lacking a little bit, but in defence you can't fault them. They have kept York out numerous times.

But we have waited for something from St Helens in attack to show us what they can do.

The hooter blares across the Eco-Power Stadium in Doncaster and off we go in the second period.

A reminder that this is the first game of a Challenge Cup double-header on the BBC.

Hull KR and Wigan Warriors meet in the first men's semi-final, with that one getting under way at 13:45 BST.

Wigan were most recently winners in 2022, while Rovers lost to a golden-point extra-time drop-goal by Leigh Leopards' Lachlan Lam in a dramatic Wembley final last year.

Watch it live on BBC One from 13:15 BST, with text and radio coverage also available on the BBC Sport website and app.

On Sunday, we will learn which team will face either St Helens or York in the final at Wembley on 8 June.

Both Wigan and Leeds have 100% winning records in the Women's Super League in 2024 - something has to give.

It's a 12:30 BST kick-off and you can follow it with us, with live TV, radio and text coverage on the BBC Sport website and app.

Full credit to York, if anybody doubted them [with the players they have out] look at that first half, look at how much they want to fight for it.

Sandwiched in between those two scoring moments for St Helens was a long spell of York pressure, but Valkyrie have not yet been able to find a way through a wall of red and white shirts.

And when Saints created their best chance, they were clinical with it.

It's only a one-score game so this semi-final could still go either way, for sure.

Image source, PA Media

Leah Burke's try and a Faye Gaskin penalty separate the sides at half-time in Doncaster.

Katie Mottershead makes a great break from dummy half to get Saints within 10 metres of York's line but their momentum is halted by a forward pass.

York's set of six in reply ends with a high kick which is claimed by try-scorer Leah Burke, who is then on the wrong end of a high tackle.

One last chance for points before the interval.

Rhiannion Marshall sends up a high kick to the corner on the last tackle of York's latest set, but Phoebe Hook is solid underneath the high ball to end any threat to Saints' try line for now.

Four minutes left of a draining first half.

A rare error from Emily Rudge as the Saints and England second-rower spills a pass on halfway and gifts possession back to York, who would love to reply to that Leah Burke try before half-time.

They won't do it quite yet - Sade Rihari's grubber kick is fumbled out of play behind her posts by Saints full-back Beri Salihi - but they'll receive the ball back from a goal-line drop-out.

That just shows you how good St Helens' defence has been.

The first time they get to put on some real pressure in this half they manage to break York's defence.

There is nothing more tiring than defending your own line and they have managed to push it out.

A bit of miscommunication among the York backline, a Zoe Harris kick drifts out into touch and Saints have a 40-20.

Big opportunity, this.

Saints spread the ball to the left touchline and York's Carrie Roberts gives away a penalty for a high shot on winger Leah Burke, so Saints get a fresh set of six within five metres of the line.