Event: NSDCA Division 4

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Opponent	Rating	Result
Roger Coleman	1241	1 - 0
Neville S Jones	1508	½ - ½
Mario Scarpa	1329	½ - ½
Nicholas PA Wright	1437	1 - 0
Richard Fish	1524	1 - 0
Derek Whitehurst	1469	½ - ½
David S Johnson	1546	0 - 1

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

1551 = (10054 + 400 * (3 - 1)) / 7)