Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Norman A Wragg	1679	½ - ½
Andrew Allen	1785	½ - ½
Mick McManus	1640	½ - ½
Andrew Allen	1785	0 - 1
Nripesh Niketan	0	½ - ½

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

1298 = (6889 + 400 * (0 - 1)) / 5)