Adil Rashid kept alive Yorkshire's hopes of success with three wickets on day three against Durham at the Riverside.
In response to Yorkshire's 589-8, Mark Stoneman set-up the Durham innings in good style, moving on from an overnight 48 not out to 131 before falling lbw to Liam Plunkett, despite wickets tumbling around him.
Together with Michael Richardson, the pair put on 136 for the fourth wicket, before Richardson became the glue that held together his team for much of the day's play. The South African eventually succumbed to Rashid for an excellent 148, though his team are not clear of danger.
There were two wickets apiece for Plunkett and Ryan Sidebottom, but Rashid is likely to have a big say on the final day with the White Rose county looking to manufacture enough time to ask their opponents to bat again.
Warwickshire went to the top of the table after completing a crushing win over Middlesex, by an innings and 47 runs.
Jeetan Patel was destroyer-in-chief for the home side, his off spin being responsible for four of the Middlesex wickets for 78 runs, while Richard Jones finished with 3-53 from his 22 overs, to help bowl out the visitors for 248.
Sussex looking strong
Warwickshire's time at the top may, however, be limited if Sussex can end Lancashire's resistance at Old Trafford on Wednesday.
Despite the efforts of Alex Davies (59), Lancashire could only add a further 34 to their overnight score of 157-6, opener Steve Magoffin doing most of the damage with the ball with figures of 4-36.
Lancashire skipper Glen Chapple and slow left-armer Simon Kerrigan each took two of the five Sussex second innings wickets to fall, but it did not stop the visitors moving into a lead of 323 by the close. The home side are therefore likely to face a tricky final day if they are to avoid defeat.
A draw looks the most likely outcome at Taunton, where Nottinghamshire will go into the final day 135 runs ahead of Somerset, with eight second innings wickets standing.
Alviro Petersen top-scored for the home side with 94, while a very useful 86 from Peter Trego ensured that it would be very difficult for his team to lose.
Phil Jacques is unbeaten on 55 overnight, but unless the captains work to manufacture a positive result, the teams looks set to share the points.