Event: Belper Club Championships

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Opponent	Rating	Result
Jaime Castro	1818	0 - 1
Ian R Morrell	1143	0 - 1
James Flint	0	1 - 0
Edward Brown	1540	1 - 0
Sebastian Castro	0	0 - 1

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

820 = (4501 + 400 * (2 - 3)) / 5)