Event: SCL Div 3

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Opponent	Rating	Result
David Kinsler	0	0 - 1
Petar L Minchev	0	0 - 1
Stephen Nelson-Smith	0	1 - 0
John E Davis	0	½ - ½
Alan Dyos	0	0 - 1

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

-160 = (0 + 400 * (1 - 3)) / 5)