Event: Division 1

Opponent Rating Result
Peter E Chaplin 1986 ½ - ½
John M Guilfoyle 1912 ½ - ½
Elmira Walker 1722 ½ - ½
David Peters 1819 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1860 = (7439 + 400 * (0 - 0)) / 4)

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