EBBERSTON 2nds need only five points from their final game of the season, at fellow promotion-chasers Oriel, to secure the title - and promotion to division C of the Beckett League.
The leaders are 16 points clear of second-placed Ravenscar after easing to a nine-wicket win at home to relegated Sherburn 2nds.
Martin Marflitt struck a defiant 38 for the visitors but could not halt their slide to 74 all out, Eddie Swiers bagging 5-24 and Simon Pickering 3-6.
Frankie Beal, 31no, and James Wingrove, 28, steered Ebberston to the win.
Ravenscar, who end the season at Sherburn 2nds on Saturday, kept their promotion challenge on the right track with a 47-run success at home to rivals Oriel.
Dinesh Swamiwathan, 32, and Jees Varghese, 32no, helped Ravenscar to a steady 135-67, slow bowler Paul Greenhough taking 3-39 to boost Oriel’s hopes.
The visitors missed out on a chance to boost their own promotion bid, collapsing to 88 all out in reply, Joe Bayes weighing in with match-winning figures of 4-10.
Heslerton 2nds are still in with a shout in the promotion battle, as they are third, only two points behind Ravenscar and four ahead of Oriel, after hammering Brompton 2nds by 152 runs.
James Almond struck a magnificent 107 to help Heslerton post 221-5, Matthew Webster adding a forceful 68 for the home side.
Ross Triffitt top-scored wtih 38 for the visitors in reply, while Webster followed up his batting heroics with an outstanding return of 4-38.
Mark Dring also took 3-21 as Brompton were shot out for 69.
With only one team being relegated - due to the resignation of Hunmanby in division B in the Beckett League - Whitby 3rds are safe from the drop despite finishing second-from-bottom after a defeat at home to Fylingdales 2nds.
Bill Estill struck an unbeaten 37 to help the visitors to 117-8, and in reply, Whitby sank to 53 all out, Estill taking 3-3 and Andy Fewster 3-11.
Leighton Bailey’s unbeaten 59 helped Forge Valley 3rds to an easy eight-wicket win at Muston.
Sean Pinder, 4-28, had earlier shone as Muston sank to 94 all out.