Day two half centuries from Marcus Trescothick, Jim Allenby and Lewis Gregory put Somerset further in control of this Specsavers County Championship Division One match at Headingley.
Ryan Sidebottom returned season-best figures of five for 51 but the 38-year-old seamer could do little to release Somerset’s tight grip on the game.
Resuming the day on 107 for one, Somerset were bowled out in the evening session for 390, which gave them a first innings lead of 245, and in 22 overs to the close Yorkshire stumbled to 57 for three, still trailing by 188. Yorkshire’s bowlers were more disciplined than on the previous day but the only one to blow as hot as the weather was Sidebottom and he earned a standing ovation when he returned to the dressing room at the fall of Somerset’s last wicket.
Marcus Trescothick set out on 45 and Chris Rogers 58 and when the Australian had moved on to 63 and his partner 52 it meant that the pair had accumulated a total of 50,000 first class runs during their respective careers. Before he could add to his score, Rogers was held at second slip by Adam Lyth off Sidebottom who in the same over swung one in so much that James Hildreth offered no stroke to a ball which clattered into his off-stump.
These two blows left Somerset vulnerable on 125 for three but Yorkshire could not find anyone to give Sidebottom the necessary support and Trescothick had carefully made his way to 73 from 142 balls with 12 fours when he played on to Liam Plunkett.
Jim Allenby and Peter Trego made sensible progress in a 64 run stand but when Sidebottom re-appeared he extracted extra bounce outside off-stump to have Trego edging to wicketkeeper, Andrew Hodd, for 46. During that innings the man from Weston-super-Mare passed the 1000 first class run mark in 2016.
Allenby, having completed a solid 50 from 90 balls with eight fours, fell lbw to Adil Rashid, but Gregory and Craig Overton now increased the tempo at just the right time, Overton on-driving Adil Rashid for the first of his two sixes off the leg-spinner who trapped him lbw for 38 in the over before tea.
Gregory at the interval was unbeaten on 69 which equalled his career-best score, made against Yorkshire at Taunton in 2014, and he kept his wicket intact while Sidebottom helped to get rid of the tail, finishing on 73 with a dozen boundaries.
Then it was Gregory who struck first as Alex Lees edged him to first slip and with the ball starting to zip around under high cloud, Yorkshire were reduced to 37 for three, Gary Ballance and Andrew Gale both driving at Tim Groenewald and losing their off-stumps.
Jake Lehmann smacked three of his first five balls from Groenewald to the boundary but eased up to see out the day with Lyth who ended with 27 to the Australian’s 15.
After the match Trego, who completed 1,000 first class runs for the first time in his career, said: “This was a Championship performance with both bat and ball. It was outstanding and certainly they have been the best two days I have ever had on this ground. To be in the dominant position at the end of Day two is a great position to be in.”
“You can often get a backlash at some stage from a quality team and that might happen tomorrow but we are right in the box seat and it is our game to lose.
“It feels good to complete 1,000 runs for the first time and I have felt under some pressure to score a batsman’s amount of runs this season and I would like to score a couple more hundred runs yet. I think I have come up trumps this season on days that were tough and I want to be a very heavy run-scorer for Somerset over the next few years.”