Fieldside moved back to the top of the Premier Division thanks to a 5-1 win against New Club A.
Ian Gee beat Mick Bennett in the opening frame for New Club, but from then on Fieldside took control.
Bennett won frame two, while Karl Walker beat Justin Shepherd and Bob Chivers beat Alan Mander.
That result and an upheld match claim means that Fieldside are now four points clear of Witney A, who have two games in hand.
Witney beat Riley D 4-2.
At the other end of the table, Riley C have been well adrift all season and will be relegated, along with either New Club A or Riley B.
Witney C have secured promotion from Division 1 after a hard-fought draw against a tenacious Woodstock A, who are still in the hunt, with Oracle A and Green Road Club A, for the second promotion place.
Oracle lie second after a 4-2 win against Thame A.
Paul Evans won the opening frame for Thame, but Matty Bramall then levelled and steady play from Dave Noake against Andy Maguire saw Oracle go 3-1 up. Toby Todd won the fifth frame for Thame, but a break of 58 in the last helped Kevin Higgs wrap up the match.
Witney D secured promotion from Division Three with a 3-3 draw against Thame C.
RESULTS Premier Division: Fieldside A 5, New Club A 1; New Club A 3, Riley D 3; Riley D 5, Riley C 1; Witney A 4, Riley D 2.
Division 1: Green Road A 4, Thame A 2; Riley E 4, Abingdon Con A 2; Thame A 2, Oracle A 4; Woodstock A 3, Witney C 3.
Division 2: Thame B 2, Cowley Con A 4; Witney B 4, Thame B 2.
Division 3: Cowley Con B 3, Headington RBL A 3; Eynsham B 4, Littlemore RBL A 2; Witney D 3, Thame C 3; Witney E 4, Morris Motors B 2.
Division 4:East Ox Con B 3, Oracle B 3; Morris Motors C 2, Cowley Workers A 4; New Club B 5, House Club A 1.
Division 5: Cowley Con C 2, East Ox Con A 4; East Ox Con A 3, Littlemore RBL B 3; Littlemore RBL B 4, Eynsham C 2; Littlemore RBL 3, Yarnton RBL A 3; Littlemore RBL B 2, East Ox Con A 4
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