Event: Division 2

Opponent Rating Result
Gareth Cullen 1711 ½ - ½
Mark G Jones 1989 ½ - ½
Robbie Thornhill 1543 ½ - ½
Lynda Smith 1814 0 - 1
Paul Spiller 1939 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1719 = (8996 + 400 * (0 - 1)) / 5)

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