Event: Club Championship B Division

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Opponent Rating Result
Laura Holdforth 1181 1 - 0
Geoff Mann 1438 0 - 1
Ollie Walton 1378 ½ - ½
James Mann 1238 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1209 = (5235 + 400 * (1 - 2)) / 4)

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