Event: Club Championship

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Opponent	Rating	Result
Tom Butterworth	1307	1 - 0
Tom Butterworth	1307	0 - 1
Chris J Beckett	2128	0 - 1

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

1447 = (4742 + 400 * (1 - 2)) / 3)