Event: Div4

Opponent Rating Result
David Short 103 ½ - ½
Leslie J Fancourt 107 0 - 1
Alex Abdullahi 0 ½ - ½
Matthew Caswell 107 1 - 0
John G Kelsall 139 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

171 = (456 + 400 * (2 - 1)) / 5)

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