Event: Division 1

Opponent Rating Result
Andrew A Clarkson 1987 ½ - ½
John Whitfield 1815 ½ - ½
Kenneth Hoadley 2062 0 - 1
Cliff H Rutlidge 1857 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1730 = (7721 + 400 * (0 - 2)) / 4)

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