Event: Division 3

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Opponent Rating Result
Susan E Chadwick 1574 ½ - ½
Derek Cosens 1599 0 - 1
Ian Goodyer 1585 0 - 1
Philip Crompton 1474 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1258 = (6232 + 400 * (0 - 3)) / 4)

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