Event: Internal Standardplay

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Opponent Rating Result
John Slusar 1819 1 - 0
John Slusar 1774 0 - 1
Joseph Braithwaite 1582 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1725 = (5175 + 400 * (1 - 1)) / 3)

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