Event: Gordon Nobbs League

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Opponent	Rating	Result
Daniel H Jervis	134	0 - 1
Michael H Stinton-Brownbridge	153	0 - 1
Michael H Stinton-Brownbridge	153	0 - 1
Graham A Mill-Wilson	105	1 - 0
Graham A Mill-Wilson	105	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-110 = (650 + 400 * (1 - 4)) / 5)