Event: Graded friendlies - rapidplay

Opponent Rating Result
Keith Allen 1986 0 - 1
Henrik Fabri 2000 ½ - ½
Henrik Fabri 1978 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1855 = (5964 + 400 * (0 - 1)) / 3)

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