Division Two leaders Osbaldwick suffered their first home defeat in 11 games as they lost 5-2 to in-form Tadcaster despite twice taking the lead.
Mike Horner hit Osso's first and Nick Lawrie the second but Tad hit back with goals from Darren Wilson, Dave Shaw (2) Mathew Howgate and Tom Deighton to extend their unbeaten run to eight games.
Post Office are the new leaders after beating New Earswick 2-0, the highlight being a 30-yard volley from Simon Wade, his first goal since 2001. Julian Olive added the second.
Civil Service crashed 3-0 to Fulford whose goals came from Mark Ratcliffe, Joe Konarski and an own goal.
John Patrick hit both Moor Lane's goals in their 3-2 defeat at Selby RSSC for whom Matty Williams scored twice after Andy Jones had hit their opener. Steve Milner hit Hemingbrough's equaliser at White Horse after Alex Sykes had given Horse the lead.
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