Two tries from replacement Ben Farr helped Chinnor to a 29-7 home victory over Coney Hill.
The bonus-point win, which kept Chinnor in the chasing pack, began with a tenth-minute try from returning centre Sam Stoop.
Wing James Serrano fielded a loose clearance and off-loaded to Stoop, who sprinted in, fly half James Cathcart converting.
Chinnor’s second try came from a superb Cathcart pass, but centre Matt Goode still had to beat three defenders before sprinting in to give the former an easy conversion.
Stoop and full back Richard Williams had to be replaced either side of half-time, with flanker Adam Hastings moving to partner Goode.
Farr’s pace saw him score in the corner on 49 minutes, while Coney Hill hit back with a try from wing Paddy Knight, converted by Rory Baker.
On 68 minutes, scrum half Toby Prescott’s cross kick fell invitingly for wing Baz Corpe, who slipped in Farr for his second.
Prescott went close to a dazzling solo score, before he and Farr created try No 5 for Corpe.
Oxford Harlequins were undone by a last-gasp try and conversion in a 24-22 defeat at Redingensians.
Having battled back from 14-3 down, Quins looked to have won the game.
But with the final play, home prop Jim Baker scrambled over and fly half Spike Chandler converted.
Weak tackling allowed Redingensians full back Jevon Marsh to score a second-minute try, converted by Chandler.
Quins replied with a penalty from fly half Jeff Stewart, but on 19 minutes, wing Craig Clements sped over for the hosts, Chandler converting.
The visitors replied with a cracking try that saw scrum half Alasdair Maspero throw Stewart a long scoring pass and the latter converted.
Chandler’s penalty made it 17-10, but Redingensians had flanker Andy Amor sin-binned before half-time.
A line-out catch from Quins’ Alan Purchase set up a driven try for fellow lock Andy Boyle.
Quins led when wing Xavier Andre finished a sweeping move and Stewart converted from the touchline.
But the hosts snatched victory at the death.
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