Event: Division 2

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Opponent	Rating	Result
James N Miller	1780	0 - 1
Barrie D Cooper	1608	1 - 0
Stuart Dawkins	1600	½ - ½

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

1663 = (4988 + 400 * (1 - 1)) / 3)