Event: Division 2

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Opponent Rating Result
Rob Hearne 1948 0 - 1
David C Egginton 1705 ½ - ½
David C Osborne 1970 0 - 1
James Guest 1734 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1739 = (7357 + 400 * (1 - 2)) / 4)

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