Event: Division 2

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Opponent Rating Result
Stuart R Acton 1283 1 - 0
Kevin Stebbing 1524 0 - 1
Geoff Walker 1393 1 - 0
Kevin Stebbing 1623 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1456 = (5823 + 400 * (2 - 2)) / 4)

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