Event: Division 2

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Opponent Rating Result
Tommy Wilkins 1774 0 - 1
Freddie Pick 1990 ½ - ½
A Clive Walley 1903 0 - 1
Chris M Strong 1806 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1768 = (7473 + 400 * (1 - 2)) / 4)

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