Event: Division 3

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Opponent Rating Result
Graham J Gibson 1637 0 - 1
Gavin Dow 1432 0 - 1
Paul D Rees 1565 0 - 1
Eddie Jones 1290 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1281 = (5924 + 400 * (1 - 3)) / 4)

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