Event: The Friendly League

Opponent Rating Result
Phil M Taylor 1870 1 - 0
Andrew Hargreaves 1810 0 - 1
Jonathan Howarth 0 1 - 0
Steven M Flaherty 1588 ½ - ½
John Moxham 0 1 - 0
Regan Topham 1450 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1186 = (6718 + 400 * (3 - 2)) / 6)

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