Event: Division 4

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Opponent Rating Result
William B Drennan 1790 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1790 = (1790 + 400 * (0 - 0)) / 1)

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Opponent Rating Result
David M Rogers 1776 1 - 0
Bertrand A Barlow 1905 0 - 1
WK (Bill) Osborne 1677 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1919 = (5358 + 400 * (2 - 1)) / 3)