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Event: Major

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Opponent Rating Result
Andrew P McCumiskey 192 ½ - ½
Rafe Martyn 233 0 - 1
Roman C Mitra 201 1 - 0
Henry G Duncanson 201 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

307 = (827 + 400 * (2 - 1)) / 4)

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