Event: Division 3

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Opponent Rating Result
Lawrence F Hayden 1647 ½ - ½
Julian Tarwid 1650 0 - 1
Anthony D Robinson 1473 ½ - ½
Michael A snr Garland 1510 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1470 = (6280 + 400 * (0 - 1)) / 4)

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