Event: AG Sunderland

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Opponent Rating Result
John Grasham 1690 1 - 0
Harry Carter-Sykes 1533 0 - 1
Bryan Hesler 1770 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1531 = (4993 + 400 * (1 - 2)) / 3)

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