Event: Walker Shield

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Opponent Rating Result
Sean Duffy 1235 0 - 1
Joshua Hayhoe 1218 1 - 0
Mike Jenkinson 1308 0 - 1
Sean Duffy 1235 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1249 = (4996 + 400 * (2 - 2)) / 4)

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