Event: Hargreaves Shield

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Opponent Rating Result
Paul Ruffle 109 ½ - ½
Leon A Garfield 100 0 - 1
Graeme Boxall 99 1 - 0
Andrew M Haycock 87 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-1 = (395 + 400 * (1 - 2)) / 4)

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