Event: Open

Opponent Rating Result
Tim A Lane 1915 0 - 1
John E Crump 1983 0 - 1
David R Thomas 1863 1 - 0
Tim A Lane 1915 1 - 0
John E Crump 1983 ½ - ½
David R Thomas 1863 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1854 = (11522 + 400 * (2 - 3)) / 6)

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