Event: Rolls Royce Championship

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Opponent	Rating	Result
Stephen G Wootton	0	0 - 1
Michael D Boreham	0	0 - 1
J Martin Gibson	0	1 - 0
Daniel Blumenow	0	½ - ½
Owen Dale	0	0 - 1

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

-160 = (0 + 400 * (1 - 3)) / 5)