Event: Walker Shield

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Opponent Rating Result
Robert Cronin 1405 0 - 1
David Erwee 1436 0 - 1
Harrison Pitchford 1200 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1080 = (4041 + 400 * (0 - 2)) / 3)

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