Event: Walker Shield

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Opponent Rating Result
Robert Cronin 1405 0 - 1
John Scott 1450 1 - 0
Paul Verrall 1369 0 - 1
John Scott 1389 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1403 = (5613 + 400 * (2 - 2)) / 4)

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