Event: Dave Welch 7200 League

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Opponent Rating Result
John P Williams 1995 0 - 1
Joel Bartlett 1942 ½ - ½
Michael I Connor 1786 0 - 1
Robert J Frith 1771 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1574 = (7494 + 400 * (0 - 3)) / 4)

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