Event: Walker Shield

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Opponent Rating Result
Joshua Hayhoe 1060 1 - 0
Joseph Morris 1310 1 - 0
Kenneth Keeler 1447 ½ - ½
William Horsford 903 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1280 = (4720 + 400 * (2 - 1)) / 4)

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