Event: 400 League

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Opponent	Rating	Result
Robert Black	80	½ - ½
John HT Eddershaw	96	1 - 0
Martin Wilkes	80	1 - 0
Robert Black	126	1 - 0
John HT Eddershaw	96	½ - ½
Mick Wombell	80	1 - 0
Steven Harrison	80	½ - ½
Robert Black	80	0 - 1

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

240 = (718 + 400 * (4 - 1)) / 8)