Event: Division 1 - Open

Opponent Rating Result
James Schofield 1892 1 - 0
Joshua P Blackmore 1835 0 - 1
Andrew S Kinder 1828 ½ - ½
Catherine Black 1711 0 - 1
Ollie Main 1745 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1722 = (9011 + 400 * (1 - 2)) / 5)

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