Event: South Cheshire Shield

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Opponent	Rating	Result
David Lambton	1729	0 - 1
Harry Gardiner	1858	0 - 1
John R Booth	1829	½ - ½

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

1539 = (5416 + 400 * (0 - 2)) / 3)