I just when through WSJT-X 2,2 User Guide and learn this about field day contacts using FT8.
The following is a contact.
CQ FD K1ABC FN42
K1ABC W9XYZ 6A WI
W9XYZ K1ABC R 2B EMA
K1ABC W9XYZ RR73
I lost about 5 contact because I was not getting a 73 reply and did not count them as contact.
Have to remember this next year,