Event: Division B

Opponent Rating Result
Peter Harrington 1542 0 - 1
Brian Davies 1254 1 - 0
Matthew Poon 1581 0 - 1
Natalie Haydock 1450 1 - 0
Brian Davies 1254 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1496 = (7081 + 400 * (3 - 2)) / 5)

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