Event: B Division

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Opponent	Rating	Result
Garry J Hewitt	1638	½ - ½
Peter Harker	1758	0 - 1
Mike Pointon	1660	0 - 1
Jim A Rogers	1648	0 - 1
Paul Weightman	1548	0 - 1
Peter Harker	1732	0 - 1
Peter R Archer	1509	½ - ½

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

1356 = (11493 + 400 * (0 - 5)) / 7)