Event: January Rapidplay

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Opponent Rating Result
John G Horton 1683 0 - 1
Dennis Patterson 1390 1 - 0
James Turner 1924 0 - 1
Alan Welsh 1785 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1596 = (6782 + 400 * (1 - 2)) / 4)

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