Event: Hargreaves Shield

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Opponent Rating Result
Gary Hilleard 1692 ½ - ½
Harry J Sharples 1777 ½ - ½
Michael H Micklethwaite 1675 ½ - ½
Mats Nordgren 1605 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1587 = (6749 + 400 * (0 - 1)) / 4)

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