Event: League Division 3

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Opponent	Rating	Result
Pietro Convalle	1506	0 - 1
Steve A Spencer	1454	½ - ½
Stuart M Johnson	1552	1 - 0
RA (Bob) Maltby	1640	1 - 0
Chris Hare	1340	1 - 0
Duncan Stables	1607	0 - 1
Robert Dennington	1640	½ - ½

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

1591 = (10739 + 400 * (3 - 2)) / 7)