Event: Division 3

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Opponent Rating Result
Jake Williamson 1226 1 - 0
Adrian Hall 1318 0 - 1
Peter Jones 1200 ½ - ½
Christian Mills 1350 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1174 = (5094 + 400 * (1 - 2)) / 4)

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