Event: A Division

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Opponent Rating Result
Francis Batchelor 2067 1 - 0
Stephen W Dauber 2036 ½ - ½
Joe McGinnis 1608 1 - 0
Virgil Szekely 2172 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2171 = (7883 + 400 * (2 - 0)) / 4)

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