Event: Hammersmith Sledgehammer Cup

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Opponent	Rating	Result
Todd Sandler	1648	0 - 1
Andrew Kirk	0	0 - 1
Peter Hessey	0	½ - ½
Peter Rose	1496	0 - 1
Cian Ward	1754	0 - 1

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

660 = (4898 + 400 * (0 - 4)) / 5)