Event: B&DCL Div 3

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Opponent	Rating	Result
Graham Hillman	1690	½ - ½
Robert Halse	1855	0 - 1
Paolo Mostardi	1750	0 - 1
Robert Powell	1700	½ - ½
David Arorash	1578	½ - ½

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

1555 = (8573 + 400 * (0 - 2)) / 5)