Event: Doncaster League

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Opponent	Rating	Result
Ismet Berisha	135	0 - 1
Tim Prosser	136	0 - 1
Peter Catt	137	0 - 1

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

-264 = (408 + 400 * (0 - 3)) / 3)