Event: Norman Ellis (Open)

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Opponent	Rating	Result
Luke Gostelow	1869	0 - 1
Neil Griffiths	1657	1 - 0
Rangarirai Ernest Karumazondo	2104	0 - 1

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

1743 = (5630 + 400 * (1 - 2)) / 3)