Event: Doncaster League

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Opponent	Rating	Result
Martin J Sheard	1889	0 - 1
Peter Catt	1777	0 - 1
A David Smart	1504	0 - 1

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

1323 = (5170 + 400 * (0 - 3)) / 3)