Jonathan Agnew
BBC cricket correspondent on Test Match Special

At least there was no calamity and they will come back to fight another day. I think it's really important they don't subside tomorrow and they can take it to a fifth day.

And breathe. Cook and Jennings have got to the close. England's former captain turns around and walks straight off.

Cook is surrounded. Root watches on nervously.

Cook blocks. Kohli claps. The crowd cheers.

Kohli is making Cook wait. He calls for another helmet for the final two deliveries. He wants to get another catcher in.

Yelps of excitement from the slips but Cook sees off the first three balls. Ashwin is puffing his cheeks out in pain in his delivery stride. It's a hip issue he has.

Jennings survives.

Ravichandran Ashwin will bowl the final over...

Tom: If England are to do the seemingly impossible here it's imperative that Cook and/or Jennings step up with a serious score (if it isn't Jennings he has no hope of playing in Southampton)

Almost. Ishant beats Jennings again. The England opener nibbled at it too. Ishant brushes his sweaty fridge out of his face again. Kohli comes in for another chirp.

Matthew Broad: 250 runs a day? 1.39 per over is realistic. Nothing silly, fellas.

Geoff believes.

Kohli is still desperate for a wicket tonight. He is still shouting away and applauding his bowlers. He's like a man possessed.

Geoff in St Andrews: Excellent - under 500 required. Big psychological moment.

Graeme Swann
Ex-England spinner on BBC Test Match Special

No-one thought 400 was possible in one-day cricket until we did it four times this year.

Cook has company in the form of a slip, a gully and a short leg with Ashwin bowling. They all leap in the air when the spin takes the ball past the opener's edge.

Ashwin is hopping around too. At first I thought it was in disappointment but on the replays it looks like it's because of that injury that kept him off the field in the first innings.

That could be a big boost to England.

Graeme Swann
Ex-England spinner on BBC Test Match Special

Definitely the right move to bowl Ashwin, who has dismissed Cook twice in this series with absolute pearlers, I'm sure the India fielders will keep reminding Alastair Cook of that.

Ishant wastes the end of the over. Jennings can leave comfortably.

It's going to be time for Ashwin. Someone play the Jaws music.

Cook on strike...

Ben Dunckley: Get the feeling that if Jennings wants to play the fourth Test he needs to still be at the crease by tea tomorrow.

India could have had two or three wickets now. Keaton Jennings is smiling but he knows he's got away with one. It's another beauty from Ishant, almost unplayable. Is this the same pitch?!

The crowd are trying to get behind England. They roar a clip from Cook to the boundary. Bumrah's pace is up at around 90mph but he can't find a way through. He is swishing his cap in frustration after taking it from the umpire.

Graeme Swann
Ex-England spinner on BBC Test Match Special

I wonder if Hardik Pandya will get a couple of overs from this end. I'd be very tempted if I was Virat Kohli.

How has this delivery not got Cook out? It pitches on off and then nips away, beats the edges and misses the stump by a matter of millimetres.

Kohli is buzzing around. He's chirping in the slips.

Proper theatre.