Event: NSDCA Division 4

Opponent Rating Result
David S Johnson 1508 0 - 1
Rowan J Webb 1100 0 - 1
James Wolstenholme 1000 0 - 1
Ian Mullin 1200 0 - 1
Carl Thornhill 1243 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

810 = (6051 + 400 * (0 - 5)) / 5)

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