Event: Division 3

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Opponent Rating Result
Michael J Morgan 1899 0 - 1
Iain Reeve 1709 1 - 0
Edward Hargreaves 1651 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1620 = (5259 + 400 * (1 - 2)) / 3)

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