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Sittingbourne captain Anthony Hogg stretches for the ball Picture: Andy Payton
Folkestone Invicta secured fourth place in Ryman League Division 1 South and a play-off spot after a 4-1 win at Chipstead in their final game of the season.
Frankie Chappell opened the scoring seven minutes before the break and Stuart King added a second-half hat-trick to go joint-top of the division's scoring charts with 24 for the season. Andrew Dalhouse briefly brought the hosts back to 2-1.
Maidstone United striker Shaun Welford needs a final-day hat-trick to secure a share of the Golden Boot, but his 21st of the season was in vain as 10-man Walton Casuals came from behind to beat the Stones 3-2.
Welford put United ahead but Josh Gallagher and Nathan Abery turned it around before the break. Baff Addae drew the visitors level from the penalty spot after Jon Boswell was red-carded for the Casuals on 52 minutes, but Abery's second ensured the points.
Maidstone now need to win at Bognor Regis Town, who need a win to try and claim the title, to have any chance of a play-off place next Saturday.
Sittingbourne were unable to do their tenants a favour as they went down 3-1 at home to Godalming Town, who went fifth, and need just a point to confirm the final play-off place.
Adam Foulser and Dan Read scored in a four-minute burst just before the break and Read had made the game safe on 66 minutes before Elie Kayembe's free-kick gave Bourne a late consolation.
Hythe Town ended Worthing's hopes of the making the play-offs with a 3-1 win at Reachfields.
Dave Cook put Town ahead early-on and though Ryan McBride levelled before the break, Brendon Cass and Jimmy Dryden made the points safe for Town.
Faversham Town allowed a surprise 1-0 lead at title-chasing Dulwich Hamlet slip to a 3-1 defeat.
Adrian Stone put the Lilywhites ahead after just six minutes, and Town's lead continued until seven minutes into the second half when Kevin James levelled.
Omarr Lawson put Dulwich ahead 16 minutes from time and James added his second in stoppage-time.
Whitstable Town suffered a 1-0 defeat at home to bottom side Burgess Hill.
Pat Harding's goal 22 minutes from time took Hill off the bottom and two points clear of Whyteleafe, who Town face in their season finale next weekend.
In Ryman League Division 1 North Chatham Town lost their third straight game with a 2-0 home defeat to Needham Market, which left them 15th.
Lee McGlone opened the scoring nine minutes into the second half and although the Chats went close to an equaliser, Angelo Harrop added a late second.
Thamesmead Town were edged out by Harlow in a five-goal thriller.
Theo Fairweather-Johnson cancelled out an early Reece Dobson goal but Daniel Elmes scored twice to make it 3-1 before the break meaning Ashley Probets' second-half penalty was a mere consolation for 10th-placed Mead.
Cray Wanderers play-off hopes in Ryman League Premier Division were dealt a blow after being held to a 1-1 draw at Bury Town.
Wands are ninth and five points outside fifth-place, though with two games remaining after Lewis Perkins cancelled out a first-half Lee Smith opener.
Margate led 2-0 against Billericay but were pegged back, having to settle for a point which secured the title for the Essex side.
Dan Stubbs converted a penalty after six minutes and followed-up with the rebound after another spot-kick was saved five minutes into the second half.
However Ricay snatched a draw with another penalty from Glenn Poole 15 minutes from time and Rob Swaine's goal on 85 minutes.