REPORT: 10-man Tulips pull off a stunning win
A goal down at the Dog & Duck at half-time the Tulips looked destined for defeat when Neal Spafford was sent off 10 minutes into the second half after committing a second cautionable offence.
But new boss Chris Rawlinson threw caution to the wind with positive changes and substitute Jenk Acar equalised from the penalty spot on 66 minutes before Leon Mattem won the game with a terrific 20-yard strike direct from a free kick seven minutes later.
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Hide AdIt was the first win this season for Spalding over a serous promotion rival.
Spalding remain second in the table, just three points behind leaders Shaw Lane, but the top dogs have five games in hand.
Only the champions are promoted with the next four teams entering the end of season play-offs.
Spalding are 10 points clear of sixth-placed Basford.