Event: Championship 2019

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Opponent	Rating	Result
Keith J Riach	125	0 - 1
Tom Devlin	105	0 - 1
Rashpal S Potiwal	71	0 - 1
Rob Letton	139	0 - 1
S Neil Bolton	83	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-135 = (523 + 400 * (1 - 4)) / 5)