Event: Walker Shield

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Opponent Rating Result
Clive J Le Baigue 1548 0 - 1
Adrian Tottenham 1450 1 - 0
Joshua Hayhoe 1060 1 - 0
Thomas E Simpson 1450 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1377 = (5508 + 400 * (2 - 2)) / 4)

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