Clifton College fly half Ioan Lloyd kept his cool to seal his team a memorable success in the SOCS Daily Mail Schools Trophy.
Lloyd landed two late kicks to help Clifton pip Marlborough College 30-29 in the oldest fixture between school teams in the calendar dating back to 1864.
Marlborough had led 26-13 going into the last 15 minutes only for Clifton to dominate the closing stages.
Clifton College fly half Ioan Lloyd kicks the match-winning penalty (left) and celebrates (right)
However, Clifton were still nine points adrift with four minutes left and needed a try, which started in a move from their own half, by wing Rob Clarke plus Lloyd's touchline conversion and, finally, his match-winning penalty.
Victory gives Clifton a third win from four games in this season's Trophy which is a national competition sponsored by the school management system, SOCS.
Bedford turned to a famous old boy in former England captain Budge Rogers for a pre-match pep talk before a 27-8 win over Dulwich.
The words of Rogers helped produce Bedford's best play of the season especially in the first half which ended in a try-saving tackle by flanker Joe Wallace.
Clifton College wing Rob Clarke scores a late try against Marlborough College
Bedford needed some more good defence towards the end but by then a try from captain Alfie Orchard, following a kick and chase, had put them clear.
Next up for Bedford is a tilt on Saturday at champions Wellington who are unbeaten in six games, the latest a 39-17 win over Warwick.
A summer tour to Japan has helped Stamford to be undefeated in four games including success over local rivals Oakham, Oundle and Uppingham.
This year's Daily Mail Schools Rugby Trophy is well underway.
Flanker Dave Koelman, who forms an effective back row alongside captain Monty Toseland and Ed Cox, scored four tries in the win over Oakham. Tom Charsley-Evans is becoming an accurate kicker.
Canford are another school team on the up having added the good scalp of Hampton to an earlier win over Millfield.
A first win at Hampton, 36-22, included a debut performance at fly half for fifth former Thomas Sykes. Full-back James Elwood contributed one of the six tries and landed three conversions.
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