Event: Five Counties Div 1

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Opponent	Rating	Result
Brian E Foster	1541	0 - 1
Samuel Knight	1312	0 - 1
Aashna Patel	1101	1 - 0
James Knight	0	0 - 1

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

789 = (3954 + 400 * (1 - 3)) / 4)