Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Tim Humphries	1850	0 - 1
Andrew Birtwhistle	1781	1 - 0
Edouardos Ter Gevorkian	1940	0 - 1
Oliver Brennan	1775	½ - ½
Ewan Kershaw	1991	1 - 0
Jim Davis	1971	0 - 1

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

1818 = (11308 + 400 * (2 - 3)) / 6)