Event: Division 2

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Opponent Rating Result
Graham Robertson 1611 1 - 0
Dejan Lekic 1670 1 - 0
Andrew G Gibson 1722 0 - 1
Julie L Denning 1590 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1748 = (6593 + 400 * (2 - 1)) / 4)

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