Event: Silver Rook

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Opponent Rating Result
David Halpin 0 1 - 0
Edward Adams 0 1 - 0
John M Rose 0 0 - 1
John W McHugh 87 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

122 = (87 + 400 * (2 - 1)) / 4)

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