A pulsating 30-13 home victory over Maidenhead gave Chinnor the South West 1 title on Saturday, and promotion to the National League.
But this was nowhere near as comfortable as the scoreline suggests.
Maidenhead had already beaten Chinnor once this season and looked a good bet to complete the double when leading 13-0 after 55 minutes.
They used the wind well to dominate the first half.
But just as they had done at Weston-super-Mare two weeks earlier, Chinnor never let their heads drop and responded magnificently in the final quarter.
Richard Williams had come off the bench to kick the winning penalty at Weston, and this time he was on hand to score the decisive try.
Chinnor had clawed their way back to 13-13, but it was not until the 76th minute that Williams found space to cross on the left.
Chinnor may have started the brighter, but were 6-0 down inside 20 minutes after two penalties from visiting winger Dan Walton.
Their strong-running centre Simon Cripps had looked threatening from the start and he proved too hot to handle on 28 minutes when he powered over on the left.
Walton added the conversion and even the most ardent Chinnor supporters were starting to have doubts.
Lock Matt Hutchins was sin-binned in first-half stoppage time, but Chinnor held on to the break.
Chinnor finally got a foothold when full back James Hewitt calmly slotted a penalty on 55 minutes.
And they got lucky seven minutes later when Maidenhead full back Joe Plamus fumbled a bouncing ball on his own 22.
They quickly spun the ball wide from the resulting scrum, Rewi Tolich found Eric Brown on the left wing and he had more than enough pace to score.
Hewitt converted the try and equalised with his second penalty on 73 minutes.
Williams had given the hosts an extra attacking dimension and notched the crucial try, which Hewitt converted, after Maxwell had broken through in midfield.
His dramatic swallow-dive finish said it all there was no stopping Chinnor now.
After battling well, Maidenhead ran out of steam at the end as Hewitt kicked a third penalty and converted a second Brown try that brought his league total to 20.
The final whistle was the cue for champagne and celebrations.
Oxford Harlequins produced a fine second-half display to defeat Penryn 34-15 and ensure their status in the division.
Leading only 17-15 after a disjointed opening period, they clicked into top gear after the break.
Andy Henley and Andy Noyce scored first-half tries for Quins, with fly half Ben Cottenden adding a penalty and two conversions.
The hosts rang the changes at half-time, with Louis Eggar and Tom Chapman replacing Alex Dyer and Simon Chadbone in the pack.
And a minute later, Cottenden scored an excellent try.
Paddy Soper and Chapman also went over, with Cottenden converting one.
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