Event: Walker Shield

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Opponent Rating Result
John Dickie 1375 0 - 1
Joshua Hayhoe 1072 1 - 0
Darren Coker 1102 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1316 = (3549 + 400 * (2 - 1)) / 3)

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