Sean Ervine was left to rue some important dropped catches that could have made a good day for Hampshire even better at Somerset.
The Rose Bowl outfit dominated their old foes for the third day running.
But they may harbour a tinge of regret that the game isn’t over already, with the home side still 157 runs behind Hampshire having just three wickets in hand.
Ervine, who hit 98 with the bat in Hampshire’s mighty 627 for nine declared, failed to hang on to a tough chance at short leg from Imran Tahir’s bowling as Alfonso Thomas survived his first ball.
Thomas went on to hit an unbeaten 79 in a frustrating partnership but Hampshire should still have enough to close out the match today.
Ervine said: ‘It was another good day.
‘Obviously, we would have liked to have taken a few more catches but we would have taken that definitely.
‘My dropped catch was included in that.
‘It was a tough chance but I’m pretty harsh on myself and I should have taken it.
‘You can’t do anything about it once it’s gone – you’ve just got to go on and do the best you can.
‘You don’t really keep thinking back to it – you can’t really.’
Adams, who resumed his innings on 204 with the visitors on 480 for four overnight, fell early as he added just three more runs to his total.
But Ervine then led the charge and was unlucky to fall just two runs short of his century.
He said: ‘It was pleasing but a shame I didn’t get 100.
‘I didn’t feel in great rhythm but if someone offers you 98, you would take it.’
Hampshire then looked well on course to complete victory with Somerset reduced to 132 for six before Thomas and Craig Meschede (53) put on 134 for the seventh wicket.
Dimi Mascarenhas removed Meschede in the final over of the day and the final three wickets should be a formality if there is a full day’s play.
Ervine said: ‘We batted well in the morning and then came out after lunch, used the new ball very well and took a lot of wickets up front, which was crucial.
‘At tea, it looked like we could win in three days.
‘But as soon as the new ball wore off, the wicket is good to bat on and it’s always tough.
‘Alfonso batted really well but we got a wicket at the end.
‘It was frustrating but we kept our discipline.
‘At some point there was always going to be a partnership.
‘There’s a possibility it may rain but you have to play with the cards.’