I think this is Chesterfield's first visit to Boston for a competitive fixture. The only competitive match against their first team I have in my archive is a 3-1 defeat at Chesterfield in the
FA Cup in 1974. They are currently mid-table in the National League.
My Computer only does predictions for League games, but I reckon it would probably predict a draw at the end of normal time, so I'm going for:
Boston United 2-2 Chesterfield (25)