Event: Derby & District Division 1

Opponent Rating Result
John M Potter 2153 ½ - ½
David Hatton 1791 1 - 0
John M Potter 2153 0 - 1
Anthony L Natt 1896 ½ - ½
Steve P Retout 2021 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2083 = (10014 + 400 * (2 - 1)) / 5)

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