Event: Division 1 - Open

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Opponent Rating Result
Charles V Howard 1877 0 - 1
Mark V Abbott 1897 1 - 0
Joshua P Blackmore 1835 ½ - ½
Piotr Ruszelak 1784 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1748 = (7393 + 400 * (1 - 2)) / 4)

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