Event: A Division

Opponent Rating Result
Nikolay Milchev 2241 ½ - ½
John S Reed 1932 ½ - ½
Robert A Newton 1965 ½ - ½
Dale R James 2064 0 - 1
Jeff Mason 1748 1 - 0
Lorand Sakic 1990 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2057 = (11940 + 400 * (2 - 1)) / 6)

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