Aus now lead series 6-4 on points
A draw keeps the series alive
Eng resumed on 40-0 (trailing by 128)
Aus 448-9 dec (Perry 213*); lead by 168 on first innings
Inaugural day-night women's Test
North Sydney Oval; England won toss
Lisa Sthalekar
Ex-Australia all-rounder on BBC Test Match Special
When I first toured England in 2001, we played two Tests. Perhaps we could have a series with three ODIs, three Tests and three T20s.
Trail by 127
Australia surround the bat from ball one, with a helmeted silly point (Beth Mooney) in place, while Alex Blackwell at slip has also donned a helmet. Tammy Beaumont gets England under way with a nudge to short fine leg.
99 to go!
It's bright and sunny at North Sydney Oval, and Australia are going to open with the left-arm spin of Jess Jonassen from the City End. There will be 100 overs today - let's play.
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Isa Guha
Ex-England seamer on BBC Test Match Special
Perry is the only person on the planet who can say she's won an Ashes series, won a cricket World Cup, scored a Test double-century, and scored a stunning goal in a football World Cup. And she stayed around to sign everyone's autographs yesterday - a wonderful ambassador for the sport.
Could this be the day you win the Ashes?
Australia captain Rachael Haynes on TMS: "We've not spoken about it, but we know it. It's about taking a session at a time, we need to make sure we're disciplined with the ball and create pressure.
"Katherine Brunt bowled a really good first spell yesterday so I think seam will play a role, but I think our spinners will be dangerous."
Isa Guha
Ex-England seamer on BBC Test Match Special
The game won't be decided in the first session, but it will be crucial. England gave Australia a few too many freebies in the first session yesterday - Perry barely played a false shot.
Isa is right there. The last thing England should do is retreat into their shells, adopt ultra-defensive tactics and bat like they did at Canterbury in 2015 - Lydia Greenway took 137 balls to score 16, and England lost anyway.
Isa Guha
Ex-England seamer on BBC Test Match Special
Given the nature of the pitch, we're looking at a draw. There might be a wobble at some stage, but it's about how England hold their composure. They've witnessed some incredible mental resilience from Perry.
They can't just have the mindset of digging in for a draw - they need to play the way Lauren Winfield and Tammy Beaumont did last night.
Jim Maxwell
BBC Test Match Special
You need a bit of pace in the pitch in women's cricket to get the game moving. We've only had 19 wickets fall in three days. The only thing that's kept this game alive has been the extraordinary batting of Ellyse Perry.
Charles Dagnall
BBC Test Match Special
The surface doesn't discernibly look different to day one - the centre part of the pitch hasn't changed in four days. The rough is too full - the batsmen will easily be playing that. The best thing you can do with this pitch is get a spade out and dig it up. I've got a bottle of pop with me - I might spill some on a length.
If England survive the first hour, I can foresee this pitch winning.
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I don't want to sound like a killjoy for England's hopes - but realistically there is no way they can win this game. They trail by 128, and unless they were to dramatically increase the scoring rate, there's just not enough time left in the game for them to pass Australia, set a big enough target to dangle a carrot, declare, and still have time to bowl the Aussies out.
Australia's equation is simple - win today and they'll retain the Ashes as the four points would give them an unassailable 8-2 lead in the series (with two points available for each of the three Twenty20 internationals, an 8-8 draw would see the Aussies retain the trophy).
That leaves the draw. If England can hold out and avoid defeat, it'll be two points each, Australia would go 6-4 ahead, but the series would still be alive. However, barring any washouts in the T20 series, England would need to win all three of those games to triumph.
If a Test match is like a symphony, with quick and slow movements that sometimes build to an overwhelming crescendo, the crowd at North Sydney Oval were treated to a virtuoso performance yesterday.
Ellyse Perry began the day on 70 not out - having never made an international century in her 10-year career with Australia - but by the time they declared, she was unbeaten on 213.
It's left Australia firmly in the driving seat for day four, as I'll explain.
Image source, Getty ImagesMorning, everyone - and welcome to the fourth and final day of the Women's Ashes Test.
Most people were agreed that this game was fairly even after both of the first two days' play.
But yesterday was all about one woman...
Image source, Getty Images