Event: Dave Welch 7200 League

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Opponent	Rating	Result
Danylo Laba	1681	½ - ½
Ben Graham	1600	1 - 0
James Clarke	1783	½ - ½

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

1821 = (5064 + 400 * (1 - 0)) / 3)