Event: Spring Swiss

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Opponent	Rating	Result
Paul J Coppard	1211	1 - 0
Martin Griffin	1528	1 - 0
Carl Purkiss	1565	0 - 1

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

1568 = (4304 + 400 * (2 - 1)) / 3)