Event: Silver Rook

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Opponent Rating Result
Alan S Metcalfe 1637 1 - 0
John Grasham 1645 1 - 0
Charlie Woodbridge 1751 0 - 1
Eli Maunder 1439 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1618 = (6472 + 400 * (2 - 2)) / 4)

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