Event: Open

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Opponent Rating Result
David Thomson 1945 1 - 0
Ray Hall 1660 0 - 1
David Thomson 1945 0 - 1
Ray Hall 1660 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1603 = (7210 + 400 * (1 - 3)) / 4)

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