Event: Division 1

Opponent Rating Result
Dave Patrick 1808 ½ - ½
Peter D Rooney 2049 1 - 0
Callum Welsh 1927 ½ - ½
Robert Dennington 1626 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1953 = (7410 + 400 * (1 - 0)) / 4)

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