Essex beat Middlesex by innings & 34 runs
Harmer takes 14 wickets in match
Somerset & Hampshire draw
Game called off at Trent Bridge
Wins for Northants & Derbyshire
Northants 261 & 289-7d v Leicestershire 157 & 299-7
Richard Gleeson has taken two wickets in two balls to turn the game in the hosts' favour.
First he had Lewis Hill caught by Chesney Hughes before pinning new man Rob Sayer lbw first ball. Mathew Pillans survived the hat-trick ball, but Northants are now looking for just three more wickets and they have 25 overs to find them.
Essex 542-3 dec v Middlesex 246 & 237-4
Image source, Rex FeaturesNick Compton flashes at Mohammad Amir and the ball flies just past gully and down to the boundary.
The century-maker didn't know too much about that one - but he's still there.
John Simpson then plays and misses at one from the Pakistan left-armer.
It's gloomy at Chelmsford, the floodlights are beginning to take full effect already.
Essex 542-3 dec v Middlesex 246 & 229-4
Image source, Rex FeaturesIt's all gone a bit flat at Chelmsford.
Simon Harmer comes on for Jamie Porter, a pink ball just a few overs old to sling down.
The Division One leaders need wickets from their magical spinner - and quickly.
24 overs remain.
#bbccricket
Dave Wood: Game very much on the Ageas Bowl. Great decision by Bailey to declare.
Sussex and Northants are in similar positions in Division Two, both needing wickets to complete a win in the final session of this day/ night round.
Sussex have Gloucestershire 136-6 and need four wickets to win, with 26.5 overs to get them. Jack Taylor (27 not out) and Kieran Noema-Barnett (3 not out) stand in their way.
Northants have Leicestershire 296-5 and need five wickets to win, with 27 overs to get them. Colin Ackermann (85 not out) and Lewis Hill (18 not out) stand in their way, with 98 runs for a Foxes win a possibility too.
Hampshire 211-9d & 96-5d v Somerset 147 & 5-2
Two wickets in four balls for Gareth Berg! Game on at the Ageas Bowl.
It's a fantastic ball from the Hampshire seamer and Adam Hose can only nick it behind.
James Hildreth joins Steven Davies at the crease.
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Hampshire 211-9d & 96-5d v Somerset 147 & 4-1
What a brilliant catch by James Vince!
Marcus Trescothick hits Gareth Berg towards extra cover and Vince clasps it.
Do Hampshire have a sniff? Adam Hose comes in at three.
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Essex 542-3 dec v Middlesex 246 & 226-4
Mohammad Amir is making the new pink ball talk - but Essex are running out of time.
26 overs to go and Middlesex are chipping away at that lead - they trail by 70.
John Simpson drives one towards Ravi Bopara at cover and it drops just short - not even a half chance.
Hampshire 211-9d & 96-5d v Somerset 147 & 0-0
Steven Davies is promoted to open the batting with Marcus Trescothick.
Davies hasn't been able to buy a run this summer since his move from Surrey - can he win the game for his side this evening?
Somerset have 31 overs to chase it down.
Northants 261 & 289-7 dec v Leicestershire 157 & 286-5 (target 394)
Alex Winter
BBC Radio Northampton sport
Say what you want about the pink ball but in the end it's produced a thrilling game and Leicestershire need 108 to win from 31 overs with the new ball taken immediately - does the new ball make Northants favourites?
The game could have been already over had Northants held all their chances today but it's a huge session in the promotion race.
Essex 542-3 dec v Middlesex 246 & 215-4
Image source, Rex FeaturesNick Compton and John Simpson resume after the dinner break at Essex.
Simpson says good evening with a four off Dan Lawrence.
29 overs remain - Essex need six wickets. The new ball is being taken and on comes Mohammad Amir. Last chance saloon for the Division One leaders.
Notts need 75 to win
Bad news Notts fans, the rain is still falling at Trent Bridge and overs are now being chalked off.
If they get back on at 20:30 BST, there will be time for 10 overs.
Kent players will be doing plenty of rain dances in the away dressing room.
Restart at 19:10 BST
Hello, what's this at the Ageas Bowl?!
The rain has stopped, Hampshire have declared on 96-5, and Somerset need 161 to win at just over five an over.
Play will start in about 10 minutes.
Excellent news!
Notts 371 & 0-0 v Kent 180 & 265
The covers are still on in Nottingham. Notts need 75 if and when they get out there.
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Sussex 358-9 dec & 142-1 dec v Gloucestershire 150-1 dec & 117-6
Adrian Harms
Sports reporter, BBC Sussex
It's difficult to keep Jofra Archer out of the action as he takes a brilliant catch at fine leg diving forward and clutching the ball millimetres off the turf, and George Hankins goes for an excellent innings of 51
Survival is the name of the game for Gloucestershire who have 32 overs to see out the draw, Sussex are however looking for their fourth win in five games to continue their move up the table.
Image source, BBC SportThanks Felix.
We're heading into the final session of this day-night round of fixtures now.
I'm not quite sure how I feel about that - there have been some cracking games, but the weather has been an absolute stinker!
Plenty of time for twists and turns in these final couple of hours though. Stick with me...
A steady session, with games appearing to move towards draws comes to an end.
And with that I'm going to hand you all back over to Gary Smee who will take things to their conclusions.
Essex 542-3 dec v Middlesex 246 & 211-4
John Simpson crashes a Dan Lawrence long-hop through extra-cover to the boundary to take us to tea / dinner.
Middlesex trail by 85 runs, with six wickets in hand. Barring a collapse, it looks like this is going towards a draw.
Derbyshire (288 & 160) beat Glamorgan (237 & 172) by 39 runs
A dream debut for Derbyshire's 16-year-old leg-spinner Hamidullah Qadri is complete as he wraps up the match with his fifth wicket.
Michael Hogan chips him to Jeevan Mendis at mid-wicket and Glamorgan are all out for 172. Qadri has 5-60.
It's a first Championship win in almost two years for Derbyshire. Incredible.
Essex 542-3 dec v Middlesex 246 & 207-4
Nick Compton and Paul Stirling put on 153 runs together in 54.5 overs.
It's 42 wickets in the County Championship this season for Simon Harmer too. Amazing effort from the South African, who has bowled a whopping 127 overs more than any other Essex bowler in the competition too.
Dinner is around the corner as John Simpson joins Nick Compton.