Chichester dug deep to win the first-versus-second battle at Oaklands Park, toppling Gravesend 19-15.
The Blues - roared on by a huge crowd in the warm spring sunshine - trailed 9-0 in the first half, led 12-9 at half-time but fell 15-12 behind before going over for what proved the winning try.
It puts them four points clear of Gravesend with two games left - although the Kent side do have an extra game to play. That means wins in their final two games, away to Brighton and Wimbledon, are imperative for Chichester.
Watch our video highlights (above) and see full coverage of the win in the Observer, out on Thursday.