Tim Ambrose's first century in the LV= County Championship for three years moved Warwickshire closer to the Division One title and seriously damaged Nottinghamshire's challenge at Edgbaston.
The leaders are now 31 points ahead of their Trent Bridge rivals after declaring at 504 for six and then taking for wickets for 188, although they were held up late in the day by fifties from Alex Hales and Chris Read.
When bad light chalked off the last 10.2 overs - with the visitors still 316 behind - Hales had reached 80 not out and Read, ever the man for a crisis, was on 54 in a partnership worth 119.
Controversy erupted on the third day of the match between Somerset and Surrey at Taunton.
With the hosts on 191 for five in reply to 317, Murali Kartik ran out Alex Barrow as he was backing-up and Surrey skipper Gareth Batty declined the opportunity to call the 20-year-old batsman back when umpire Peter Hartley offered it.
While it was a legitimate dismissal, it is considered against the spirit of the game. Kartik and Batty were jeered by the crowd for the remainder of the innings, which saw Somerset bowled out for 294, Peter Trego making a defiant 92, including two sixes off Kartik and 13 fours.
By the close Surrey had reached 58 without loss in their second innings and led by 81 going into what now is sure to be a hugely competitive final day.
A composed innings of 70 by Keaton Jennings enabled Durham to have the best of the third day's play against Lancashire at Liverpool. Replying to the home side's first innings total of 262, Paul Collingwood's team were 187 for four at the close, still 75 runs in arrears but with only one day left to play in a match which looks set to end in a draw.
Half-centuries by Neil Dexter and Sam Robson helped lift Middlesex to 306 in reply to Worcestershire's 323 in the weather-hit match at New Road. Dexter led the way with 90 and figured in a century stand for the fourth wicket with Robson, who made 72.
By the close the hosts led by 61 on 44 for the losses of first innings century-maker Daryl Mitchell, Phil Hughes and Moeen Ali
- Murali Kartik
- Alex Hales