Forum A were victims of a giant-killing in the third round of the Oxford & District League's Handicap Shield.
Haddenham emerged triumphant as their team of Rodney Browne, John Cripps and Simon Witney took full advantage of their 230 start to book a place in the semi-finals with a victory over the top Division 1 side.
With home advantage, Haddenham won by 105 points to send Forum packing without the need for the final doubles match.
Forum's Fraser Harris and Andrew Flint found it hard going, as only Karl Bushell managed to keep the Haddenham players in check.
He won his three matches by exactly the required margin, as if to demonstrate how tough the task was for Forum.
Bicester A overcame St James B by just 18 points to book their place in the semis.
Tony Gorman, Mark Penn and Sohail Caratella never looked troubled as they chipped away at the 240 start that St James were awarded.
Paul Oakley, Bob Ford and Tim Borrowdale could not make an impression on the talented Division 2 side Bicester A, who are looking like the team to beat this year.
Forum H, with a 105 start, had the closest win of the round over Bicester C, winning by just 15 points.
Nick Lacey, Steve Laird and Wendy Chapple put up a good fight for Bicester, but then ran into trouble as Glen Stiffle, Brian Rowles and Kyle Harris stepped up the pressure.
Lacey set up Bicester's last chance with a 21-5, 21-12 win over youngster Harris, but Stiffle then cancelled that out with a 21-19, 15-21 win over Laird.
Vikings C took the last spot in the semis with a comfortable win over Begbroke B.
Begbroke's 70-point start had all but gone after the first seven singles. James Hopkins, David Casey and Robin Whitehouse rarely troubled the Vikings team of Paul and Anne Borrowdale, and Steve Woolnough.
Paul Borrowdale did most of the damage for Vikings, but Woolnough excelled in beating Hopkins 21-3, 21-14, as Vikings ran out winners by 44 points.
In the semi-finals, Forum H are at home to Bicester A, with Forum given a huge 260-start. Haddenham travel to Vikings with a more modest handicap of 20.
HANDICAP SHIELD
3rd round: Begbroke B (+70) 373, Vikings C 417; Forum H (+105) 416, Bicester C 401; Haddenham (+230) 473, Forum A 368; Bicester A 420, St James B (+240) 402.
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