Event: Division 3

Opponent Rating Result
Mark Gowers 1678 1 - 0
Jo Carthew 1664 0 - 1
Julian Clark 1808 0 - 1
Nick Warren 1801 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1738 = (6951 + 400 * (2 - 2)) / 4)

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