Pocklington maintained second place with a hard-earned 14-10 home verdict over Doncaster Phoenix.
Pocklington went 8-0 ahead at half-time with a penalty by Nick Bennett and a try by winger Charlie Allen.
Despite starting the second half with 14 men after a player was yellow carded at the end of the first, Doncaster came back with a try by centre Mick Sykes between the posts, Ben Millar converting.
Bennett and Millar exchanged penalties and Bennett made sure of the win with his third penalty seven minutes from the end.
West Leeds closed in on their rivals with a 36-29 win at Skipton.
The sides turned round level at 17-17, and the score was 29-29 until Leeds winger Dan Thorpe raced over for a stoppage-time try. Centre Sam Neave had scored two for the visitors.
Barnsley moved ahead of their rivals after twice coming from behind for a 38-23 victory at Ripon.
After an early penalty by Patrick Jensen for Barnsley, Ripon took the lead when centre Rick Harrison crossed for a try and Patrick Whitaker converted.
Jensen added a second penalty and converted a try by winger James Colman to put the visitors 13-7 ahead, but Ripon turned round 17-13 in front after Whitaker kicked another penalty and converted a penalty try.
Barnsley took control in the second half when Colman completed a hat-trick of tries and there were others from centre Andrew Buckingham and scrum-half Chris Beck.
Stand-off James Swift converted all six tries and added a penalty to help Huddersfield YMCA to a 45-6 win over hosts Old Rishworthians.