Event: Division 4

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Opponent Rating Result
Stefan Winman 1421 0 - 1
Stefan Winman 1421 0 - 1
David J Stuart 1383 ½ - ½
Ben Jarvis 1050 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1219 = (5275 + 400 * (1 - 2)) / 4)

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