Event: Division 6

Opponent Rating Result
Sterling Gibson 1363 1 - 0
Tim Wrigley 1798 0 - 1
Alex Piercy 1500 0 - 1
William A Bill Penny 1605 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1567 = (6266 + 400 * (2 - 2)) / 4)

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