Event: Armstrong Cup

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Opponent Rating Result
Richard Oxnard 1565 0 - 1
John S Clarke 1807 ½ - ½
Paul Edwards 1930 1 - 0
Steve Burnell 1809 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1778 = (7111 + 400 * (1 - 1)) / 4)

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