Event: Division 2

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Opponent	Rating	Result
Peter Ackland	1477	1 - 0
Thomas Ash	1700	0 - 1
Robert P Radford	1728	1 - 0

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

1768 = (4905 + 400 * (2 - 1)) / 3)