Event: Dave Welch 7200 League

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Opponent	Rating	Result
Adam Stoddart	1694	0 - 1
Ian Paul Stephens	1768	1 - 0
David Eisen	1755	½ - ½

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

1739 = (5217 + 400 * (1 - 1)) / 3)