Event: Norman Ellis (Open)

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Opponent	Rating	Result
Mike Bramson	1978	0 - 1
Matt Jones	1724	0 - 1
Neil Griffiths	1657	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1520 = (5359 + 400 * (0 - 2)) / 3)