Postpublished at 11:01 British Summer Time 2 May 2021
Play is under way at four grounds - with the exception of Hove, where we have had some rain.
Yorkshire beat Northants by one run at Headingley - only the club's second single-run Championship win
Gloucestershire chase down 348 to beat Leicestershire and lead Group Two
Lancashire defeat Sussex by 5 wickets at Hove and stay top of Group Three
Somerset beat Middlesex by 4 wickets - their third win of the season
Essex draw with Worcestershire at New Road despite enforcing follow-on
Josef Rindl and Paul Grunill
Play is under way at four grounds - with the exception of Hove, where we have had some rain.
Our BBC commentators are in place at the five grounds where matches have reached the final day. For ball-by-ball coverage on the game of your choice, select the commentary link from the top of the page.
Saturday was a momentous day for Nottinghamshire, who finally registered their first County Championship win since June 2018, when they beat neighbours Derbyshire by 310 runs.
The home side had no answer to the potent Notts pace attack as they were bowled out for just 159, with England's Stuart Broad claiming 4-37.
But they weren't the biggest winners on the day as Surrey and Durham wrapped up huge innings victories over Hampshire and Warwickshire respectively.
West Indies paceman Kemar Roach returned career-best figures of 8-40 as Surrey won by an innings and 289 runs at the Kia Oval, while Brydon Carse led the way with 5-49 as Durham walloped the previously unbeaten Bears by an innings and 129 runs at Chester-le-Street.
Looks like there could be odd bursts of rain which might affect some of today's games, but let's hope any delays are only short ones.
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After third day's play
Group One
Worcestershire trail by 259 runs with 5 wickets standing
Group Two
Leicestershire lead by 271 with 7 wickets standing
Somerset need another 103 to win
Group Three
Lancashire need another 129 to win
Northants need another 126 to win
According to Agatha Christie's master detective, Hercule Poirot, cricket is the English enigma, a game where even the players are unsure of the rules.
Let's hope, though, that the teams are fully clued in with some thrilling final-act finishes in prospect in the five remaining Championship games.
We will have all the words necessary to describe what is happening around the grounds.
Will it be as much fun as Toyah and Robert's Sunday lunch videos? That's setting the bar high, but we'll certainly try our best.
Play starts at 11:00 BST.