Beaconsfield defeated Swindon 25-18 to get the better of Saturday's mid-table Southern Counties North encounter.
Swindon started strongly and soon pushed Beaconsfield into committing a penalty.
Neil Maycock easily slotted the kick to put Swindon into an early lead.
Beaconsfield attacked from the restart and soon after came the turning point of the first half.
Beaconsfield won a lineout just inside Swindon's half, their fly-half chipped the on-rushing Swindon defenders and collided with one of them.
The referee blew up and, strangely, sent two Swindon players to the sin bin Paul Daniels and Ian Reynolds.
The decision changed the game and soon after Beaconsfield scored a converted try.
Swindon had to up their workrate to stay in the game, and the game lost another two players to the bin after a fracas Beaconsfield's No 8 amd Swindon's Mark Scarrott.
With Swindon now down to 12 players the front five still managed to hold their own, and another Maycock penalty closed the gap to 7-6.
Beaconsfield, though, scored a try and also slotted two penalties to extend their lead to 18-6.
Not long after Daniels and Reynolds returned, Swindon scrum-half Jimmer Courtney picked up and scored the try of the game from just outside the Beaconsfield 22.
Courtney was tap-tackled just short of the line, but his momentum allowed him to slide over, Maycock adding the conversion to cut the deficit to 18-13 at half-time.
In the second half Swindon's forward power was too much for the home side but in worsening weather conditions, handling errors foiled all their good work.
Swindon eventually levelled when, from a scrummage, Reynolds picked up and drove, the ball was recycled and Andrew Prowse dived over to score.
It was not to be though and with 10 minutes remaining, there was still time for Beaconsfield to respond and claim victory.
Fielding a long clearance kick, Swindon's full-back was caught by four Beaconsfield players, the No 8 coming away with the ball to score under the posts, the conversion taking them further away.
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