Event: A&B Division

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Opponent Rating Result
Bernard Price 1843 0 - 1
Andrew G French 1581 ½ - ½
Paul Weightman 1569 ½ - ½
Ray Pallister 1608 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1650 = (6601 + 400 * (1 - 1)) / 4)

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