BBC Somerset's Stephen Lamb at Taunton:
"Somerset extended their first-innings lead to 184 in the middle session of day two at Taunton, for the loss of their two openers.
"Tom Abell, after reaching his maiden first-class century, eventually fell lbw to Gareth Berg for 131, while Marcus Trescothick continued to reach 153, his highest score of the season, before losing his off stump to Fidel Edwards with the new ball.
"But Tom Cooper maintained the momentum set up by the two openers, and reached the tea interval unbeaten on 82.
"Somerset also enhanced their chances of avoiding relegation by taking the maximum of eight bonus points."