Event: Division 3

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Opponent	Rating	Result
David Griffiths	1585	½ - ½
Keith W Roper	1710	1 - 0
Vincent B Naan	1690	½ - ½
Ronald Watson	1399	1 - 0
Benjamin Humphreys	1588	½ - ½
Jim Wellington	1543	0 - 1
Jim Wellington	1543	½ - ½
Malcolm Jackson	1448	0 - 1
Eddie Jones	1290	½ - ½

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

1533 = (13796 + 400 * (2 - 2)) / 9)