Event: 9th South Cheshire Shield

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Opponent	Rating	Result
John R Day	130	0 - 1
Alberto Gissi	119	0 - 1
Julian Bulbeck	101	1 - 0

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

-17 = (350 + 400 * (1 - 2)) / 3)