Event: St Mary's Qualifier

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Opponent Rating Result
Sam Pickering 0 1 - 0
Philip Blakeman 1057 0 - 1
Alistair Craggs 1317 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

658 = (2374 + 400 * (1 - 2)) / 3)

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