Durham title charge held up
Durham's advance towards the title was held up first by determined Derbyshire batting and then rain on the opening day of their match at Derby.
In a contest crucial to both ends of LV= County Championship Division One, Durham's bowlers were only able to capture one wicket after Paul Collingwood won the toss and put the home side in to bat.
Chris Rushworth removed Ben Slater but Derbyshire captain Wayne Madsen (32no) and Paul Borrington (30no) dug in to steer their side to 99 for one when rain washed out play for the day after lunch.
Nearest challengers Yorkshire made better progress, claiming three bowling bonus points as they reduced Sussex to 276 for nine at Hove.
Ryan Sidebottom took three for 44 for Yorkshire, while Liam Plunkett and Kane Williamson took two apiece.
But they could have been in an even stronger position had it not been for for an unbeaten 78 from Ben Brown, who helped Sussex recover from 164 for seven.
Middlesex's mathematical chances of winning the title were further damaged by bad weather and Nottinghamshire's Steven Mullaney at Lord's.
When bad light and then a fine drizzle ruled out most of the opening day's final session, Mullaney was on 88 not out in a Nottinghamshire first-innings score of 161 for two.
Craig Meschede took three for 37 as Somerset piled the pressure on Surrey in their bottom-of-the-table clash at Taunton.
Surrey were 195 for eight when bad light ended play, and it could have been worse but for a 64-run partnership for the eighth wicket from Gareth Batty (39) and Stuart Meaker (30no).
Division Two leaders Lancashire made a commanding start to their match against Leicestershire at Old Trafford with the bat during a heavily rain-affected opening day.
They were 92 without loss from 21 overs at lunch, after which there was no play possible, thanks to Paul Horton (42no) and Luis Reece (31no).
An unbeaten 83 from Owais Shah helped Essex recover to 186 for four against Kent as they look to close the gap to second-placed Northamptonshire.
The visitors were 117 for four at Canterbury before Shah and Ben Foakes (38no) put on an unbroken 69 for the fifth wicket.
James Vince was unbeaten on 106 as Hampshire closed a rain-shortened first day on 197 for three against Worcestershire at New Road.