Event: D&DCL Div 1

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Opponent	Rating	Result
John Potter	2109	0 - 1
Paul Madden	2106	0 - 1
Benjamin I Nevett-Farman	1950	½ - ½
Andrew Robins	1750	1 - 0
Peter JE Ackley	2107	½ - ½
Martin Pettinger	1819	0 - 1
John Potter	2109	0 - 1

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

1821 = (13950 + 400 * (1 - 4)) / 7)