Event: Division 2

Opponent Rating Result
David Griffiths 1649 0 - 1
Nick J London 1706 0 - 1
Neil Graham 1760 0 - 1
James W Goodhead 1743 0 - 1
D Philip Morgan 1734 ½ - ½
Simon Scott 1682 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1512 = (10274 + 400 * (1 - 4)) / 6)

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