Event: SCL Div 1

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Opponent	Rating	Result
Graham J Willetts	1868	½ - ½
Fraser N McLeod	1898	½ - ½
James I Chilton	1847	0 - 1
Keith DF Gregory	2015	0 - 1
Harry Smith	1817	1 - 0
Matthew Coldwell	1735	0 - 1
Thomas Philidor	1725	0 - 1

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

1672 = (12905 + 400 * (1 - 4)) / 7)