Event: Division 1

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Opponent	Rating	Result
Simon D Arnold	1872	0 - 1
M John Cawston	1802	0 - 1
A Jon Griffith	1782	1 - 0

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

1685 = (5456 + 400 * (1 - 2)) / 3)