Chester Jets reached the BBL play-offs final after Brighton threw away a 17-point third-quarter lead in Birmingham. A succession of three-pointers from Yorick Williams, Randy Duck and Michael Brown had put the Bears ahead after the Jets dominated the first half.
Still trailing 79-72 with two minutes left, Calvin Davis and John McCord helped reduce the deficit to a point.
Ryan Huntley sunk a couple of free throws and Brighton missed three shots in their last offence.
"We always felt we were still in the game," said Huntley.
"We've got veterans on our team and we've got confidence. When it came to those last two free throws, all I was thinking about was hitting them - nothing else."