Event: Silver Rook

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Opponent Rating Result
Roger N Winterburn 1510 0 - 1
David Callaghan 1071 1 - 0
Awen Gitay 1439 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1207 = (4020 + 400 * (1 - 2)) / 3)

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