Event: Walker Shield

Opponent Rating Result
Frank Usher 1473 0 - 1
John L Clarke 1333 0 - 1
Darren Coker 1090 0 - 1
John L Clarke 1333 0 - 1
Martin Jordan 1300 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1066 = (6529 + 400 * (1 - 4)) / 5)

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