Event: Hargreaves Shield

Opponent Rating Result
John Thorley 140 1 - 0
Peter LT Blundell 118 0 - 1
Peter LT Blundell 118 0 - 1
Richard A Clement 129 0 - 1
Gary Hilleard 118 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-115 = (623 + 400 * (1 - 4)) / 5)

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