Event: Dave Welch 7200 League

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Opponent Rating Result
Sanjoy K Banerjee 1733 ½ - ½
Peter Mellor 1750 1 - 0
Shay Hanlon 1707 0 - 1
Graeme R Solomon 1701 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1823 = (6891 + 400 * (2 - 1)) / 4)

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