Event: Atkinson Cup

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Opponent	Rating	Result
Mark Robinson	1200	1 - 0
Richard Atkinson	1563	0 - 1
Edward S Oxley	1758	0 - 1

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

1374 = (4521 + 400 * (1 - 2)) / 3)