Event: Croydon Shield

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Opponent	Rating	Result
Samuel Barlerin	1941	1 - 0
James MG Toon	0	0 - 1
David A Varley	1783	1 - 0

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

1375 = (3724 + 400 * (2 - 1)) / 3)