Event: Steele Cup

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Opponent	Rating	Result
Mark Towlson	1542	1 - 0
Jasper Jeffs	1602	1 - 0
Alan D Evans	1582	0 - 1
Robert Twigg	1403	0 - 1
Jasper Jeffs	1602	0 - 1

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

1466 = (7731 + 400 * (2 - 3)) / 5)