In a tie I thought the final race decided on who wins, but this isn't the case. What is the rule that is used?
A8.1 If there is a series score tie between two or more boats, each boat’s race scores shall be listed in order of best to worst, and at
the first point(s) where there is a difference the tie shall be broken in favour of the boat(s) with the best score(s). No excluded
scores shall be used.
A8.2 If a tie still remains between two or more boats, they shall be ranked in order of their scores in the last race. Any remaining ties
shall be broken by using the tied boats’ scores in the next-to-last race and so on until all ties are broken. These scores shall be
used even if some of them are excluded scores.
Rules Reference