Chippenham conceded a penalty in the second minute and never recovered on a testing day for the Wiltshire club.
They were two down within ten minutes and the hosts added a third early in the second half to kill the game off.
Kye Holly limped off with an injury while Pratt, Lye and Allison also had to receive treatment.
Chippenham now need to win all suix of their remaining games to have a chance of reaching the play-offs. That begins Tuesday night at Yate Town.
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