Event: Norman Ellis (Open)

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Opponent	Rating	Result
Paul Howden	1771	1 - 0
Paul May	1833	½ - ½
Warren B Dennison	1953	1 - 0
Luke Gostelow	1869	0 - 1
Ben Strutt	1876	0 - 1

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

1860 = (9302 + 400 * (2 - 2)) / 5)