In every RR tournament with a tie that I've looked at, the person who takes 1st is the one who beat the person they were tied with. So, if player A and player B both have 7 wins and 1 loss, and player A lost to player C and player B lost to player A, player A would be 1st and player B would be second.
I can't confirm that this is how it always is, but it's how it's been in the tournaments I've looked at.
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