Event: Division 2

Opponent Rating Result
Daniel Wright 0 1 - 0
Robert McDonald 1790 ½ - ½
William F Tracey 1555 1 - 0
Michael R Elgin 1485 1 - 0
Adrian DP Waldock 1675 ½ - ½
David Simpkins 1390 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1583 = (7895 + 400 * (4 - 0)) / 6)

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