Event: Christmas Rapidplay

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Opponent Rating Result
Andrew Salter 1305 1 - 0
Joseph Machin 1469 0 - 1
James Mann 1237 0 - 1
Malcolm Goldspink 1236 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1112 = (5247 + 400 * (1 - 3)) / 4)

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