Event: A Division

Opponent Rating Result
Daniel T Lee 2096 0 - 1
Andrew I Wilson 2026 0 - 1
Philip Armstrong 1995 0 - 1
Roger G Williamson 2184 ½ - ½
Joshua Pink 2068 0 - 1
Mitchell R Burke 2070 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1807 = (12439 + 400 * (0 - 4)) / 6)

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