Event: Division 4

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Opponent Rating Result
Robin Lee 1461 ½ - ½
Alistair T Morton 1562 0 - 1
Tom McMahon 1384 0 - 1
Vladimir Chtym 1513 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1380 = (5920 + 400 * (1 - 2)) / 4)

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