They beat the 2019 winners by 56 runs and so pile the pressure on Parley, who will probably have to win at both Havant (August 7) and at leaders Sway a fortnight later to fulfil their double dreams.
Bournemouth, now fourth in the log, batted consistently up top with fit-again Tom Robinson (39) building on the solid start by Sam Collins (35) and Martin Miller (24), and Sarang Urankar (42) chipping in later to ease Jonny Coombs’s lions to 180-5.
Turning out against his old Parley club, where he enjoyed a lot of past success, Collins was playing his first match since dislocating a finger.
Teenager Marcus Bragginton (29) caught the eye for Parley, but the evergreen Paul Garlick (3-20) and spinner Conor Smith (4-36) proved too much for the visitors, who slipped to 124 all out and a first defeat in eight.
The remaining games for the top three, separated by 14 points, are –
Sway: Andover II (h), Winton (a), Alton II (a), Parley (h).
Havant II: Alton II (a), Parley (h), Longparish (h), Easton & Martyr Worthy (a).
Parley: Portsmouth II (h), Havant (a), Sway (a), Alton II (a).
Early season pace setters Old Basing continue to slide down the table, Compton & Chandlers Ford chasing down a reduced target to win by four wickets at the Memorial Ground.
Andy Gorty was MVP for CCF, following up his 4-25 return with the ball by making a key 34 with the willow.
Old Basing fell from 65-1 to 129 all out but then had Compton in a pickle. Chasing a rain reduced target they plunged to 47-5 before Gorty and Scott Spearing got CCF home with 16 balls to spare.
Alton's Mike Salmon, with a miserly 3-8 off eight overs, and Nathan Vincent (3-22) shared six Portsmouth II wickets to leave the Southsea club wobbling at 110-7 before Paul Hungerford (36) gave the bowlers some defence.
Alton lost three for 21, but Michael Heffernan hit an unbeaten 74 and, aided by Ben Weatherall (25) and Salmon (25), secured the 21 point that lifted the Brewers to eighth place.
Lymington strengthened their second team with leading Premier League bowler Matt Metcalfe and left-hand opener Terry Crabb at bottom side Easton & Martyr Worthy.
The visitors made 162 – Liam McCrory (33 and Ollie Elliott (26) top scored – and dismissed Easton for 138 (Will Wickham 46), Crabb’s spin earning a 3-26 reward and Metcalfe 2-29.
The win inched Lymington out of the immediate danger zone, but Andover II are deep in it despite Thanura Watta Wadnge’s 70 against Winton, who chased down 187-7, with Joe May (46) adding the icing to earlier knocks by Sean Wienand (41) and former Bashley (Rydal) and Dorset spinner Sam Thomson (32), who earlier took 3-20.
So, going into tomorrow’s round 13 matches, Andover and Easton & MW occupy the bottom two places, with Burridge II sitting precariously above them.
With Bedhampton’s place to be filled, three will go up from Division 2, where Bramshaw are currently undefeated, but (Ryde apart) still have Bishop’s Waltham, Ferndown Wayfarers and second placed Odiham & Greywell still to play. Ryde are third with a posse of clubs in heir wake.