Event: R Division

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Opponent Rating Result
James Marshall 1289 ½ - ½
Leon McGuigan-Lazo 1200 1 - 0
James Marshall 1289 0 - 1
Leon McGuigan-Lazo 1200 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1345 = (4978 + 400 * (2 - 1)) / 4)

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