Event: Dave Welch 7200 League

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Opponent Rating Result
Kevin A Sartain 1778 ½ - ½
Graham AG Williamson 1748 0 - 1
Adam Stoddart 1694 ½ - ½
Shay Hanlon 1707 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1732 = (6927 + 400 * (1 - 1)) / 4)

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