Event: D Division

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Opponent Rating Result
Hunain Malik 1689 ½ - ½
Hunain Malik 1689 0 - 1
Peter Horwell 1612 1 - 0
David Kilmartin 1433 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1606 = (6423 + 400 * (1 - 1)) / 4)

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