Tasmania successfully defended their 261 as they gained a 28-run first-innings lead and extended their advantage over Western Australia to 59 after two days.
Steve Magoffin started the day on a high for the Warriors with a six-wicket haul, but there was no help from the batsmen as they were dismissed for 233.
The opener Liam Davis tried hard to keep the innings together with 67, but the Tasmania bowlers kept chipping away and were rewarded with two points and a jump over their opponents into
fourth spot. Western Australia's chase was going well at 2 for 110, but Michael Swart and Mitchell Marsh went in four overs and they were 7 for 157 after Davis, Luke Ronchi and Nathan Coulter-Nile departed in quick succession.
Luke Pomersbach was left to hold on and his 32 was supported by Magoffin's 20, but they both left with too much work to do, even with Michael Hogan's late blast of 24 off ten balls, including three sixes. The wickets were shared around, with Adam Griffith, Brendan Drew, Tim Macdonald and Xavier Doherty earning two apiece.
Tasmania had to face 18 overs before stumps and lost Rhett Lockyear for 18 on the way to 1 for 31. In the morning the Tigers added seven runs as Magoffin finished with an impressive 6 for 44. Macdonald and Tim Paine (31) were both caught behind in a quick finish to the innings.