Event: Division 4

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Opponent Rating Result
Wojciech Slupski 1446 0 - 1
John Wilson 1000 0 - 1
Michael Wheeler 1290 1 - 0
David Collinson 1362 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1075 = (5098 + 400 * (1 - 3)) / 4)

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