Event: Division 2

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Opponent Rating Result
Stephen M Williams 1808 ½ - ½
Brent Perrin 1953 0 - 1
Stuart P Iles 1790 0 - 1
Samson Main 1724 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1719 = (7275 + 400 * (1 - 2)) / 4)

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