Event: South Cheshire Shield

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Opponent Rating Result
Martin J Chadwick 1323 1 - 0
Andrew Crosby 1447 1 - 0
Sandra G Blackburn 1562 ½ - ½
Nigel Gardner 1499 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1658 = (5831 + 400 * (2 - 0)) / 4)

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