Talk:Pet Arena/@comment-1827303-20130306144232

Judging by the image, I'd say it works like this:

Round 1: A1 vs. A2; B1 vs. B2; C1 vs. C2

Round 2: A vs. B; B vs. C

Round 3: A/B vs. B/C

If B were to win the second round twice, it would make it fight itself.