Event: Division 2

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Opponent Rating Result
Peter Smith 1451 0 - 1
Peter Kukiewicz 1332 0 - 1
Mark Oakden 1603 1 - 0
Michael Harrison 1344 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1333 = (5730 + 400 * (1 - 2)) / 4)

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