Event: B&DCL Div 5

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Opponent	Rating	Result
Manuela M S Alves	1450	0 - 1
Harshal Kulkarni	1510	1 - 0
Barry MS Jolly	1601	½ - ½
Roger D Howell	1463	0 - 1
Tim Joyce	1661	0 - 1
Harshal Kulkarni	1510	0 - 1
Azhar Ghose	1391	1 - 0

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

1398 = (10586 + 400 * (2 - 4)) / 7)