Event: Division Four

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Opponent Rating Result
Waleed Tahir 1745 0 - 1
Sean Doherty 1495 1 - 0
Mark E Tallis 1620 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1620 = (4860 + 400 * (1 - 1)) / 3)

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