Event: Division 4

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Opponent Rating Result
John R Day 130 ½ - ½
Neville Layhe 137 1 - 0
Karol Grzybowski 137 0 - 1
David S Johnson 113 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

229 = (517 + 400 * (2 - 1)) / 4)

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