Event: Bedfordshire Individual Championship

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Opponent	Rating	Result
Brian J Valentine	1910	0 - 1
Peter Taylor	1815	0 - 1
Robert Wilson	0	0 - 1
Mahmoud Dairi	0	1 - 0
David Webber	1541	1 - 0

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

973 = (5266 + 400 * (2 - 3)) / 5)