Event: Division 3

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Opponent Rating Result
Greg Thompson 1612 0 - 1
Emile Kosviner 1257 0 - 1
Mark Webb 1362 ½ - ½
Peter Jones 1200 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1258 = (5431 + 400 * (1 - 2)) / 4)

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