Event: Division 5

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Opponent Rating Result
David Walshaw 1671 0 - 1
Naman Berry 1465 0 - 1
Martin D Brookes 1325 1 - 0
Steve Armstrong 1387 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1462 = (5848 + 400 * (2 - 2)) / 4)

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