Event: Walker Shield

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Opponent Rating Result
Paul Verrall 1421 1 - 0
Toby Budd 950 1 - 0
Charles EASTON 1428 1 - 0
Don Richards 1347 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1687 = (5146 + 400 * (4 - 0)) / 4)

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