Event: Bottom Half A&B Division

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Opponent Rating Result
Dave Frank 1516 1 - 0
Joseph Thomas Machin 1526 1 - 0
Michael J Creaney 1595 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1679 = (4637 + 400 * (2 - 1)) / 3)

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