Event: Armstrong Cup

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Opponent Rating Result
John S Clarke 1820 ½ - ½
J Dave H Hair 1723 0 - 1
Steve Burnell 1858 0 - 1
Steve Burnell 1827 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1607 = (7228 + 400 * (0 - 2)) / 4)

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