Event: Dave Welch 7200 League

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Opponent Rating Result
Shay Hanlon 1707 0 - 1
Steve J Burge 1694 ½ - ½
John J Grady 1620 1 - 0
Ben Graham 1600 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1755 = (6621 + 400 * (2 - 1)) / 4)

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