Event: Division 2

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Opponent Rating Result
Graham AG Williamson 1748 0 - 1
Gareth Ellis 1812 ½ - ½
John J Grady 1620 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1593 = (5180 + 400 * (0 - 1)) / 3)

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