Event: Graded friendlies - rapidplay

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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)