Event: Hargreaves Shield

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Opponent Rating Result
Richard A Clement 129 0 - 1
David Erwee 100 1 - 0
David Erwee 100 1 - 0
John R Couzens 118 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

112 = (447 + 400 * (2 - 2)) / 4)

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