Event: Super League

Opponent Rating Result
Richard Freeman 1998 ½ - ½
Richard Freeman 1956 ½ - ½
Rob E Wilden 1743 1 - 0
A Clive Walley 1926 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1906 = (7623 + 400 * (1 - 1)) / 4)

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