Event: Dave Welch 7200 League

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Opponent	Rating	Result
Mark S Wadsworth	1744	1 - 0
Bob Amos	1600	1 - 0
Ewan Herd	1622	0 - 1

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

1789 = (4966 + 400 * (2 - 1)) / 3)