Event: South Cheshire Shield

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Opponent	Rating	Result
J Graham Sands	1550	1 - 0
Jon EW Blackburn	1661	½ - ½
Alberto Gissi	1653	1 - 0

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

1888 = (4864 + 400 * (2 - 0)) / 3)