Event: D&DCL Div 1

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Opponent	Rating	Result
John Potter	2109	0 - 1
Paul Madden	2106	0 - 1
John D Hoddy	1807	½ - ½
Kenneth GE Morrison	2025	1 - 0
Alex Webster	1880	0 - 1
Derek A Jarvis	1865	½ - ½
Ralph MA Allen	1828	½ - ½
D Martin Howard	2002	½ - ½
David JF Woodhouse	1630	1 - 0

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

1872 = (17252 + 400 * (2 - 3)) / 9)