Event: Morpeth Rated Rapidplay

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Opponent	Rating	Result
Phil Eastlake	1784	1 - 0
John G Horton	1903	0 - 1
Jack Gibson	0	1 - 0
Dennis Patterson	1453	1 - 0
Alan Welsh	1724	0 - 1

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

1453 = (6864 + 400 * (3 - 2)) / 5)