Event: League Division 2

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Opponent	Rating	Result
Stephen Burton	1495	0 - 1
Alex Howdle	1645	0 - 1
David Callaghan	1070	1 - 0

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

1270 = (4210 + 400 * (1 - 2)) / 3)