Altrincham have dropped to the Blue Square Bet North after losing to already-relegated Eastbourne.
Jamie Taylor hit a quick-fire brace for the visitors before Steve Brinkhurst's 25-yarder made it 3-0 at the break.
Mark Beesley pulled one back from close range, Nicky Clee notched a stunning curling effort and Beesley scored from the edge of the box to level at 3-3.
Sports' George Purcell grabbed a sensational last-minute winner with a long-range thunderbolt.
Tamworth's win over Forest Green means that a win would have seen Altrincham survive.
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