Event: D&DCL Div 2

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Opponent	Rating	Result
Jerome Redhead	1579	0 - 1
George Burdell	1729	½ - ½
Roger W Walker	1655	1 - 0
Mike P Maher	1699	1 - 0
Brian Lever	1522	½ - ½
David Hatton	1553	½ - ½
George K Heath	1313	1 - 0
Stuart Marshall	1800	1 - 0
David JF Woodhouse	1630	0 - 1
Ray Sawyer	1603	0 - 1
Stephen G Wootton	1638	½ - ½

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

1647 = (17721 + 400 * (4 - 3)) / 11)