Event: Division 1 - Open

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Opponent Rating Result
Richard Brenton 1574 ½ - ½
Joshua P Blackmore 1865 0 - 1
Joshua P Blackmore 1865 1 - 0
Richard Brenton 1574 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1620 = (6878 + 400 * (1 - 2)) / 4)

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