Event: D&DCL Div 2

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Opponent	Rating	Result
Isaac Cheale	1660	0 - 1
Peter Rose	1499	½ - ½
George K Heath	1901	½ - ½
George K Heath	1593	1 - 0
Joshua Sawyer	1495	½ - ½
Justin Smith	1724	½ - ½
Michael D Boreham	1559	1 - 0

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

1690 = (11431 + 400 * (2 - 1)) / 7)