Event: Division 1

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Opponent	Rating	Result
Rick Purcell	1855	1 - 0
David N Clark	1939	0 - 1
John J Carleton	2078	½ - ½

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

1957 = (5872 + 400 * (1 - 1)) / 3)