Event: NSDCA Division 2

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Opponent	Rating	Result
Stanislaw Wojtas	1809	0 - 1
James Richard Hanlon	1695	1 - 0
James Richard Hanlon	1695	0 - 1
Sean Tavener	1786	0 - 1
George Bulbeck	1599	0 - 1
Caroline L Mountford	1568	0 - 1
Nicholas PA Wright	1437	1 - 0
Stephen J Emmerton	1615	0 - 1
Chinenye Basil-Nwachuku	1600	1 - 0
Isaac Stanley	1441	½ - ½
Caroline L Mountford	1568	0 - 1

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

1474 = (17813 + 400 * (3 - 7)) / 11)