Event: First Mike Duck Online Tournament

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Opponent	Rating	Result
John Eve	0	1 - 0
John Harvey	0	0 - 1
Ivon S Asquith	0	½ - ½
Dhruv Lakhani	0	1 - 0
Graham Cluley	0	½ - ½

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

80 = (0 + 400 * (2 - 1)) / 5)