Event: Belper Club Championships

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Opponent	Rating	Result
Matthew Bubis	1773	0 - 1
Roger Moors	0	0 - 1
Ronald S Harrison	1540	0 - 1
Allan Doyle	1398	1 - 0
Alan Holden	1420	1 - 0

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

1146 = (6131 + 400 * (2 - 3)) / 5)