Event: Division 2

Opponent Rating Result
Andrew Hargreaves 1807 ½ - ½
Dave S Almond 1703 ½ - ½
Jonathan Howarth 1565 0 - 1
Neil Taylor 1591 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1567 = (6666 + 400 * (0 - 1)) / 4)

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