Event: Div 4 - Athenaeum Cup

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Opponent	Rating	Result
Alfie Bramhall	1482	0 - 1
Benjamin Layton	1226	0 - 1
Ethan Ball	1222	0 - 1
Steve Daykin	1380	0 - 1
Kirin Harrington	0	0 - 1

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

662 = (5310 + 400 * (0 - 5)) / 5)