Event: D&DCL Div 2

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Opponent	Rating	Result
Roger W Walker	1655	1 - 0
Neil Cameron	1688	0 - 1
David Smith	1848	0 - 1
David Williams	1870	0 - 1
Roger W Walker	1655	0 - 1
Brian Homewood	1653	1 - 0
Brian Lever	1522	½ - ½
Peter M Collins	1676	½ - ½
George K Heath	1313	½ - ½

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

1564 = (14880 + 400 * (2 - 4)) / 9)