Riley A took full advantage of their game in hand, thumping CCC B 3-0 to go three points clear at the top of Division 1.
Malcolm Bough (+50) beat Ken Olive (+70) 150-75, before Matthew Challen (+30) crushed Brian Mabbutt (+20) 200-87.
Gary Bough (+70) made it a clean sweep by beating Neil Kirby (+110) 150-112.
A shock saw Division 2 basement boys Eynsham beat leaders Ashton 2-1.
Keith Maskens (+50) put Ashton ahead by inching past Dean Watson (+40) 200-198.
But Eynsham took the next two games through Mick McCluskey (+90) and veteran Roy Gascoyne (+110).
Oracle ended a sequence of five successive losses by beating Headington Conservative Club A 2-1.
Results CCC B 0, Riley A 3; HCC A 1, Oracle 2; Eynsham 2, Ashton 1; Riley B v CC A pp; Fieldside v New Club pp.
l NIGEL Bossom (Thame) bids to defend his Arthur Cook Cup title when he takes on Alan Mander (New Club) at Eynsham Sports & Social Club on Tuesday (7.15pm).
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