Event: OTB "Friendly" Matches

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Opponent Rating Result
Peter W Rose 1835 ½ - ½
John S Marshall 1628 1 - 0
Mark Rivlin 1705 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1989 = (5168 + 400 * (2 - 0)) / 3)

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