Event: Atkinson Cup

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Opponent	Rating	Result
David Stothard	1746	1 - 0
John Scotter	1558	1 - 0
Steve R Hodge	2046	0 - 1

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

1917 = (5350 + 400 * (2 - 1)) / 3)