Oyibo off as Bulls crash again.
Joshua Oyibo became the latest Hereford player to be red carded this season as Chippenham disposed of the Bulls with little difficulty.
Alex Ferguson ( not him!) scored the winner late on after Luke Williams had pushed the ball onto the post.
Bilal Yafai's deflected 30 yard attempt had earlier squared the game at 1-1 following Josh Beeden's opener.
Jon Taylor's team have now lost three in a week and will be desperate to get something from Saturday's game against Bideford with Corby and Cambridge coming up in the next two home games.
Hereford; Williams,Onyeike,Roberts,Oyibo,Gascoigne,Barrientos,Traore,Bobes-Gilroy,Fortnam-Tomlinson,Yafai,Hawker. subs; Akinde,O'Neill,Kone,Jivanda,O'Reilly.
Chippenham: Kuapinnen,McCormack,Beeden,Smith,Tindle,Preece,Jones,Roberts,Edwards,Pook,Guthrie. subs; Ferguson,Osman,Pauley,Ballinger,Rober.