Alec Warriner marked his 18th birthday by scoring the winning try in Bicester's 13-8 victory at home to Beaconsfield in Southern Counties North.
The promising replacement charged down a late Beaconsfield clearance before skilfully gathering and touching down the bouncing ball.
Bicester's scrum, in which prop Rob Thurlow was outstanding, shunted the visitors off their own ball on four occasions.
Ross Kenny, Anthony Lewis and Adam Spencer all staged try-saving tackles on lively Beaconsfield wing Lawrence Sargent.
Fly half James Alexander gave the visitors the lead with a 25th-minute penalty.
But Steve Risbridger equalised seven minutes later after missing his first two penalties.
In the second half, flanker Dan Spencer collected Risbridger's chip before plunging over wide out.
Beaconsfield equalised when Alexander charged down a clearamce to score.
But Warriner's dramatic late intervention prompted jubilant scenes on and off the field.
Chipping Norton were left hanging on for a 20-17 home win over Slough.
Chippy should have taken an early lead, but poor handling squandered a move set up by Adam Smith and Meryck Royce.
The visitors defence was found wanting several more times, with slick passing by the Chippy forwards as they found frequent holes, but they could not turn pressure into points.
With 15 minutes gone, Matt Dawson got the break to feed Smith, who put Robbie Naish in under the sticks for the opening score, Smith converting.
Chippy were now in the driving seat and turned down several penalty chances opting to run the ball instead, Jon Hickman, Barry Nutt and Tom Hall all going close.
Try No 2 came on the half hour as Smith and Royce combined again to put Malcolm Hohls in from ten metres out.
Smith added the extras and was on hand again moments later to slot a penalty, leaving Chippy 17-0 up at half time.
Chippy began the second half full of running, but yellow cards for Ben Millard, Lee Tustin and Naish turned the tide.
Two quick tries, one converted gave Slough hope before Smith slotted another penalty.
Chippy withstood some late pressure, only allowing Slough to score on the final whistle. Witney were left with much to ponder after losing 27-10 at home to Buckingham.
A Phil Gouldie try gave Witney a glimmer of hope before the visitors scored again late on to give them a deserved win.
After a magnificent match last weekend, flanker Carl Campbell had to leave the field after ten minutes with a rib injury and his phenomenal workrate and lineout presence were sorely missed.
A converted try and penalty put Buckingham 10-0 up, but a Henry Lamb penalty reduced the deficit.
Shortly before half-time, Buckingham scored again to make it 15-3.
With skipper Jez Hicks leading the way, Witney upped the tempo, but lacked cohesion.
Buckingham bagged a decisive third try before slick handling set up Gouldie for a cracking score that Henry Lamb converted.
Witney couldn't build on this and saw flanker Tim Muller yellow-carded before the visitors scored their fourth try.
Grove lost 31-25 at home to Milton Keynes.
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