Event: Div1

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Opponent	Rating	Result
David Latham	190	½ - ½
D Martin Howard	173	½ - ½
Simon N Gilmore	188	½ - ½
Paul Madden	193	1 - 0
David Latham	190	1 - 0
Ray J Forey	170	0 - 1
Simon N Gilmore	188	0 - 1

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

185 = (1292 + 400 * (2 - 2)) / 7)