Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Jim Davis	1922	0 - 1
Ken A McIntosh	1827	0 - 1
Andrew Birtwhistle	1752	½ - ½
Henry Withington	1906	½ - ½
Callum Brewerton	1709	1 - 0
Neil Todd	1745	½ - ½
Shamil Khadaev	1661	0 - 1

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

1675 = (12522 + 400 * (1 - 3)) / 7)