Event: Div 1 - Davy Trophy

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Opponent	Rating	Result
Tom Key	1563	½ - ½
Steven J Burke	1935	½ - ½
John A Clark	1771	0 - 1
Miles T Hemingway	1692	½ - ½
W (Bill) Ward	1701	1 - 0
David Moore	1517	½ - ½
Craig Chatterton	1578	½ - ½

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

1680 = (11757 + 400 * (1 - 1)) / 7)