Event: John Newsome Cup: Beginner to 1199

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Opponent	Rating	Result
Oliver George	0	1 - 0
Eric Walker	1176	0 - 1
Ahmed Haseeb	1124	0 - 1

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

633 = (2300 + 400 * (1 - 2)) / 3)