Twin brothers Jamie and Craig Overton produced a scintillating last-wicket stand of 76 off 35 balls to put Somerset in the driving seat on the third day of the LV=County Championship match with Yorkshire at Taunton.
The pair came together at 409 for nine when Tom Cooper fell one short of a maiden century for the hosts, and went boundary crazy, Jamie smashing an 18-ball half-century, with 7 fours and 3 sixes, while Craig finished 31 not out, with 6 fours, in a total of 485. Steven Patterson claimed five for 70.
That gave Somerset an unlikely lead of 47 and soon Craig Overton was piling on the pressure with the ball, claiming three for 21 from a seven-over spell as Yorkshire slipped to 117-5 before closing on 171-5, Jack Leaning having added 52 to his first innings century.
Somerset began the day on 309 for four, with Cooper unbeaten on 55. Only two runs had been added when nightwatchman Alfonso Thomas was bowled by Liam Plunkett for four.
Jim Allenby hit a solid 31 to help combat the second new ball before having his off stump clipped by Patterson, who followed up by bowling Peter Trego for ten to make it 387 for seven.
Alex Barrow fell for a duck, strangled down the leg-side by Patterson. But Cooper saw Somerset to maximum batting points before suffering the same fate off Plunkett, having faced 157 balls and hit 18 fours.
It was an undeserved moment of misfortune for the Australian, who had looked largely untroubled in making his first major impact since joining Somerset. But just when Yorkshire were looking at a first innings lead, the Overtons combined to turn the game.
Yorkshire’s Jonny Bairstow (33) and Adil Rashid (23) were unbeaten at the close.
Craig smashed four successive fours off Patterson, while Jamie blasted four boundaries in an over off Rashid before completing a swashbuckling half-century with successive sixes off the leg-spinnner, who gained belated revenge when having him caught at slip for 50.
The momentum was with Somerset as lunch was taken and they built on it soon after the interval when Trego had Alex Lees caught behind for a single.
Will Rhodes and Leaning batted sensibly to take Yorkshire into the lead, but when Rhodes was caught at slip off the occasional off-spin of Johann Myburgh for 40 the advantage was only 35.
It was 96 for two at tea after which Craig Overton struck a purple patch, sending back Leaning, Andrew Gale and Glenn Maxwell in quick succession.
With the lead just 70, Bairstow and Rashid, who makes a habit of scoring runs against Somerset, shouldered major responsibility for digging Yorkshire out of a hole.
Both played solidly. Bairstow was unbeaten on 33 at stumps, with Rashid 23 not out, the lead 124, and a fascinating final day in prospect.