Event: St Mary's Qualifier

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Opponent Rating Result
Alistair Craggs 1317 0 - 1
Michael Pearson 0 0 - 1
Sam Pickering 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

306 = (1317 + 400 * (1 - 2)) / 3)

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