Tasmania 331 (Silk 112, Abbott 6-99, Dwarshuis 3-77) and 81 for 1 (Weatherald 63*) lead New South Wales 186 (Dwarshuis 40*, Webster 5-44, Meredith 3-43) by 226 runs
Halfway through their pink-ball clash, the home side was 81 for 1 in its second innings, boasting an overall lead of 226.
Third-placed NSW must beat Tasmania, who are last, in the final round to leapfrog Queensland and face South Australia (SA) in the final.
NSW struggled in the middle session of the day-night game on day two and were rolled for 186 in their first innings, as Webster and Meredith excelled with the ball.
Weatherald then ended the day with an unbeaten 63 and his dismissal early on Monday will be a priority for the NSW attack.
Bowling with significant pace, Meredith took two wickets in an over as the visitors were put on the back foot in their first innings. Test opener Sam Konstas only made 5 and while Kurtis Patterson (33), Josh Philippe (25) and Abbott (30) made starts, NSW lost 3 for 0 to stagger to 134 for 8.
But Dwarshuis ensured Tasmania would bat again on Sunday, belting 40 from 31 balls, with six fours and two sixes, to help take NSW past the follow-on target.
Webster, the Test allrounder, took 5 for 44 and Meredit claimed 3 for 43.
Jackson Bird dismissed Nivethan Radhakrishnan for 6 to give NSW the early breakthrough they needed in Tasmania’s second innings. Weatherald and Tim Ward (11 not out) then batted through to stumps, turning the screws tighter on NSW.
