A half-century from Ben Slater has left Derbyshire still in the hunt - requiring 117 more runs with six wickets left - after Day Three at Taunton.
Tony Palladino (3-57) and David Wainwright (3-105) claimed three apiece to dismiss Somerset for 438 during the afternoon session.
The visitors opened with a 49-run stand – before two quick wickets from Jack Leach meant Karl Krikken's side slipped to 53-2. But 57 from Slater and an unbeaten 20 from Chanderpaul helped Derbyshire close on 127-4 at stumps.
Resuming on 231-4, Somerset enjoyed the better of the morning session as Nick Compton – who top scored with 95 – and Alex Barrow (36) added 63 runs before the first wicket finally fell after an hour’s play.
With new ball in hand, Palladino (3-57) picked up his first wicket in his fourth over of the morning clean bowling Compton to reduce the hosts to 294-5.
The paceman struck again shortly after, as Barrow was caught by a diving Wayne Madsen after Shivnarine Chanderpaul had parried at first slip.
Somerset, however, continued to score freely with Piyush Chawla (16), Craig Meschede (33) and Jack Leach (19 not out) all hitting useful scores to extend the hosts’ lead over 200.
Lewis Gregory (52) – who compiled his maiden first-class half century – was finally the last man out with Somerset on 438, setting Derbyshire 244 to win.
A 49-run opening stand got the visitors off to a solid start, before Leach (2-23) removed Paul Borrington (16) and Captain Wayne Madsen (7) in quick succession to fall to 53-2.
Slater and Chanderpaul added 64 runs to move the visitors past 100, but the former was the third man out for 59 off 117 balls, including 10 fours.
Tony Palladino was sent as night-watchman, but he was dismissed in the final over for 1, as Derbyshire closed on 127-4, requiring 117 more to win on Day Four.
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