Forum A comprehensively beat Lord Nuffield A 8-2 to secure a sixth successive Oxford & District League Division 1 title - and still have three matches in hand.
Karl Bushell led the assault with a maximum, Greg Boone and Fraser Harris followed up with two-apiece, both losing to Nigel Taylor.
Forum B beat a strong Rutherford side 6-4, despite a maximum for Chris Rowlatt.
Vikings B demolished bottom side Witney A 9-1 to make it virtually certain they will end the season as champions of Division 2.
Roel Dullens and Paul Borrowdale both hit maximums, but Maurice Chambers saved Witney from a whitewash by beating substitute John Birkin 12-10 in the decider.
In Division 3, three wins for Sam Harrison, and two for Paul Woodward saw Forum E beat Bicester B 6-4 - ending Bicester's promotion hopes.
Vikings C look assured of a promotion place after beating St James B 7-3, with maximums for Ricki Whiteaway and Ken Rae.
Champions Vikings D suffered their first defeat of the season at the hands of Begbroke B.
Turning up with just a two-man team, they went down 7-3.
Division 4 champions Forum F effectively ended Holton's hopes of promotion by beating them 8-2.
RESULTS Division 1: Lord Nuffield A 2, Forum A 8 (K Bushell 3); RAL 4 (C Rowlatt 3), Forum B 6.
Division 2: Haddenham A 6, Forum C 4 (C Williams 3); Vikings B 9 (R Dullens 3, P Borrowdale 3), Witney A 1.
Division 3: St James B 3, Vikings C 7 (R Whiteaway 3, K Rae 3); Witney B 2, Bicester C 8 (D Bignell 3); Bicester B 4, Forum E 6 (S Harrison 3); Begbroke B 7, Vikings D 3 (M Aistrop 3).
Division 4: Holton 2, Forum F 8 (L Christer 3).
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