Event: Walker Shield

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Opponent Rating Result
Graeme Boxall 1435 1 - 0
Adrian Tottenham 1421 0 - 1
Don Richards 1402 0 - 1
I Redmond 1315 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1393 = (5573 + 400 * (2 - 2)) / 4)

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