Event: Division 2

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Opponent Rating Result
Thomas Keetch 0 1 - 0
Keith Melling 1367 1 - 0
Roy Bywater 1400 1 - 0
Donna Chadwick 1245 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1203 = (4012 + 400 * (3 - 1)) / 4)

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Opponent Rating Result
Natalie Haydock 1378 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1778 = (1378 + 400 * (1 - 0)) / 1)