Second-placed Yorkshire bowled out opponents Nottinghamshire for 205 on day one of their LV= County Championship Division One clash at Headingley.
In-form pair Jack Brooks and Tim Bresnan took three wickets apiece and, though Michael Lumb top-scored with 45, Notts' total owed much to a counter-punching ninth-wicket stand of 65 between Peter Siddle (39 not out) and Luke Fletcher (29).
Yorkshire openers Adam Lyth and Alex Lees, who last week put on 375 against Northamptonshire, fell cheaply this time to Siddle (two for 13) but the Tykes ended the day 52 for two with Jack Leaning 23no.
Somerset dominated the first day against Sussex, reducing their visitors to 210 for nine at Taunton.
Ed Joyce will resume one run short of a century while Peter Trego led the attack with three for 47.
Lancashire were 188 for six against Warwickshire after New Zealand spinner Jeetan Patel took three for 52.
Alex Davies, recently promoted to open the batting, top-scored with 59 and put on 78 with Andrea Agathangelou (31) but England limited-overs wicketkeeper Jos Buttler was dismissed for a duck.
In Division Two, Essex pair Tom Westley and Ravi Bopara shared an unbroken partnership of 229 as their side reached 253 for one on day two in response to Kent's 387.
Kent's last three wickets fell for 43 in the morning session, Ben Harmison returning to add 16 of those to the two he scored on Saturday before retiring hurt.
Nick Browne was dismissed for eight but Westley (114no) and Bopara (112no) made the bowlers toil thereafter.
Derbyshire new-ball pair Mark Footitt (six for 65) and Tony Palladino (four for 62) combined to dismiss Leicestershire for 311 on day one at Grace Road.
Niall O'Brien top-scored with 89 and there were also half-centuries for Ben Raine and Josh Cobb as the Foxes recovered from 11 for three. Derbyshire responded with 12 for no loss in nine watchful overs before stumps.
Alexei Kervezee top-scored with an unbeaten 65 as Worcestershire reached 175 for four against Hampshire, before bad light and rain ended the day's play one over after tea.