King's Lynn Town beat York City in a huge top-of-the-table clash at The Walks.
A second-half goal from Adam Marriott settled the issue in front of a massive crowd of 4,019.
It leaves the Linnets four points ahead of York, with two games in hand.
It's a scenario that would have been unlikely at the start of the season - York were considered among the favourites for promotion, with promoted Lynn expected to struggle. But Lynn have defied all expectations, with an unbeaten home record and just two defeats all season, the last one at York back in September.
Marriott may have scored the goal, but there was an impressive debut performance by Simon Power, signed on loan from Norwich City two days earlier. He played a part in the goal, in the 67th minute, firing a shot which keeper Pete Jameson dropped, Marriott nipping in to poke home from close range.
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