Somerset, who won none of their first five matches in the Championship, moved into the top half of the First Division table with a second consecutive victory after Warwickshire collapsed at Taunton, where Murali Kartik finished with 6-61.
In his second Championship match for the county, the Indian left-arm spinner took five wickets in the space of 21 balls as Warwickshire, who were 111-3 overnight, subsided to 207 all out. It left Somerset needing 45 to complete the win. They reached the target inside 11 overs, their only casualty being captain Marcus Trescothick.
Yorkshire will not want to take any risks with any last-day declaration at the Rose Bowl, where they lead by 216 following an unbroken second-wicket stand of 116 between Adam Lyth and Anthony McGrath.
A pitch panel convened to investigate why 17 wickets fell on the second day at Grace Road declared the pitch "above average", which came as no surprise after Glamorgan scored 198 without loss in 33 and a half overs yesterday, beating Leicestershire by 10 wickets. Leicestershire have lost four in a row, their gloom compounded by the news that Andrew McDonald has been selected to represent Australia A against Sri Lanka A next month, ruling him out of 10 Twenty20 matches.