Event: Division 2

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Opponent Rating Result
Peter Harrington 1535 1 - 0
Steven M Flaherty 1608 0 - 1
George Fishwick 1725 0 - 1
Natalie Haydock 1386 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1564 = (6254 + 400 * (2 - 2)) / 4)

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