Event: NSDCA Division 4

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Opponent Rating Result
Neil Hankey 1165 0 - 1
Ernest Wilkinson 1401 ½ - ½
Andrew Crosby 1405 0 - 1
Ken Elinor 1200 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1193 = (5171 + 400 * (1 - 2)) / 4)

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