Event: South Cheshire Shield

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Opponent	Rating	Result
Jon EW Blackburn	1661	1 - 0
Neville Layhe	1683	½ - ½
George Bowkett	1600	1 - 0

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

1915 = (4944 + 400 * (2 - 0)) / 3)