Event: Bremridge league

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Opponent Rating Result
Oliver E Wensley 172 1 - 0
John E Allen 134 1 - 0
Joshua P Blackmore 143 1 - 0
Oliver E Wensley 172 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

455 = (621 + 400 * (3 - 0)) / 4)

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