Dan Worrall takes 5-25 as Surrey defeat Warwickshire by an innings and 97 runs
Jamie Porter takes 6-34 as Essex earn a 125-run first innings lead over Middlesex
George Balderson scores second Championship century for Lancashire
Hampshire's Nick Gubbins scores 139no as they leave Somerset a target of 502
Colin Ackermann hits 93 not out as Leicestershire beat Gloucestershire
Billy Root makes unbeaten 84 but Glamorgan lose to Worcestershire
Dutch all-rounder Bas de Leede hits maiden hundred for Division Two leaders Durham
Matthew Revis scores 106 as Yorkshire set Derbyshire distant target of 571
Northants 232 & 205-5 v Lancashire 524
Seven runs in four deliveries from Lewis McManus, purely to make this commentator look silly, one presumes, has taken Northants firstly within 100 of the Lancashire total and now past 200.
Saif Zaib is on 35 and the deficit is down to 87.
Into the final two overs.
Durham 505-9 dec v Sussex 266 & 225-7
We know very little about the batting credentials of Ari Karvelas.
He tries to pull a short one from Matthew Potts and the ball flies off the top edge and over the keeper for four.
Definitely not where he intended it to go.
Durham 505-9 dec v Sussex 266 & 220-7
Bas de Leede sprints in again but his first delivery is wayward and Fynn Hudson-Prentice flicks it past the diving keeper for four.
Just a single from the rest of the over and Sussex need 19 runs to clear the deficit.
Essex 304 & 102-1 v Middlesex 179
Shadows are very long at Chelmsford. Into the final three overs of the day.
Alastair Cook has 43 from 86 deliveries while Tom Westley is on 16 from 43 after a streaky edge for four off Ethan Bamber to bring the milestone up.
The lead is 227 on a pitch which is looking increasingly placid.
Somerset 88-2 v Hants - target 502
Tom Prest tosses one up outside off stump, and Sean Dickson smashes it on the up through the covers to go to his third Championship 50 of the season.
Yorkshire 297 & 520-9 dec v Derbyshire 247 & 65-1
Harry Came plays out a Dom Bess maiden and Derbyshire reach the end of day three with only one wicket down.
Yorkshire added 341 to their overnight 179-2, with Matthew Revis hitting 106 before the declaration came, 570 runs in front.
Shan Masood (86), George Hill (79) and Jordan Thompson (64) also made significant contributions, while Derbyshire spinner Alex Thomson claimed 5-190.
Northants 232 & 190-5 v Lancashire 524
Lewis McManus has scored two from 46 deliveries with Saif Zaib (31*) almost single-handedly hauling Northants within 102 runs of Lancashire's total.
Five overs remain in the day. Plan is clear for the hosts... get through them without further loss and see what happens tomorrow morning.
Durham 505-9 dec v Sussex 266 & 214-7
What a day Bas de Leede is having?
A century earlier in the day and he now responds to being square cut for four by Jack Carson with a perfect yorker to claim his second wicket.
Sussex need another 25 to avoid an innings defeat. There are another nine overs scheduled - but maybe the additional half-hour will be needed.
Derbys 59-1 v Yorks - target 571
It's taken some time to arrive but the first boundary of Brooke Guest's innings proves worth the wait as he drills it back past bowler Matthew Revis. Guest is 16 not out and there are three overs to go.
Durham 505-9 dec v Sussex 266 & 202-6
Seven half-centuries for Oli Carter this season - still no hundred.
He plays all around a full-length delivery from Bas de Leede and his fine 153-ball innings comes to an end.
Sussex are 37 behind as Jack Carson comes out to bat with 11 overs remaining to stumps.
Somerset 75-2 v Hants - target 502
Andy Umeed and Sean Dickson take three singles from Liam Dawson's latest over, as Somerset aim to make the close of play without losing any further wickets.
Dickson has batted nicely for his 44, while Umeed has 15.
Derbys 50-1 v Yorks - target 571
Matthew Revis hit a century for Yorkshire earlier this afternoon, what can he do with the ball?
Brooke Guest collects a single from his first delivery and Harry Came clips a leg-stump half-volley away for four.
Five overs to come after this one.
Durham 505-9 dec v Sussex 266 & 198-5
Was that a dropped catch? Technically, yes.
George Drissell found the edge of Fynn Hudson-Prentice's bat but first slip only had a second to react and deflected it away for four runs.
Essex 304 & 75-1 v Middlesex 179
Alastair Cook and Tom Westley are in no real rush.
Just over 10 overs remaining in the day and the lead is up to 200.
Middlesex are desperate for more wickets as the shadows lengthen.
Durham 505-9 dec v Sussex 266 & 186-5
Easy runs for Oli Carter as Matt Parkinson pitches outside leg stump and the Sussex wicketkeeper sweeps for four.
He is now 76 not out and his side have cut the deficit to 53 runs. There are still 17 overs to go, though.
Derbys 36-1 v Yorks - target 571
Yorkshire look to Jordan Thompson for a second wicket before the close. But Harry Came has little difficulty in whipping him through mid-wicket for four.
Another Dom Bess maiden to Brooke Guest follows.
Durham 505-9 dec v Sussex 266 & 174-5
Martin Emmerson
BBC Radio Newcastle
Image source, Getty ImagesCheteshwar Pujara made only four in the Sussex first innings, so it was unlikely he would fail again - and he didn't.
Sussex were 70-4 and trailing by 169 when he was joined in the middle by Oli Carter. Both were approaching their 50s by tea, but there were signs Pujara was becoming becalmed by then as his scoring rate began to dry up.
He managed only two more runs in the nine overs after the break before falling lbw to Matt Parkinson for 51 from one that stayed low.
It was Parkinson's sixth wicket of the game. He's set to leave Durham after this and seems set for Kent before the end of the season. He's joining them full-time next year anyway.
At five down Sussex have another 21 overs to see out today.
Derbys 32-1 v Yorks - target 571
A maiden from Dom Bess to Brooke Guest and there are 12 overs left in the day's play at Scarbados.
Guest has five and Harry Came is 18 not out and Derbyshire need these two to be walking off together at the close.
Northants 232 & 165-5 v Lancashire 524
Sam Whiteman's season is over. He's wafted his bat at a wide one from Will Williams and chopped onto off-stump.
719 runs for Northamptonshire this summer and back-to-back fifties to finish his spell at Wantage Road.
The deficit is down to 127 but only five wickets remain.
Lewis McManus joins Saif Zaib in the middle.
Essex 304 & 64-1 v Middlesex 179
Nick Browne had looked so good but he's prodded outside off and nicked behind for John Simpson to take a good catch down to his left.
Breakthrough for Middlesex, who are 189 in arrears.
Tom Westley joins Alastair Cook, who has 25.