Event: Ipswich Club Championship

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Opponent	Rating	Result
Adam Wilson	0	1 - 0
Piotr Dolewka	0	½ - ½
Thomas Sheat	0	1 - 0
Ken Lunn	0	1 - 0
Tom Gordon	0	1 - 0
Angus Irving	0	½ - ½

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

267 = (0 + 400 * (4 - 0)) / 6)