Event: B&DCL Div 2

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Opponent	Rating	Result
John Belinger	134	0 - 1
Brian Curran	149	½ - ½
Michael J Litchfield	137	1 - 0
Michael Jackson	147	½ - ½
John Belinger	134	½ - ½

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

140 = (701 + 400 * (1 - 1)) / 5)