Event: Div 4 - Athenaeum Cup

Opponent Rating Result
Chris B Halliwell 0 0 - 1
Ivan Basarab-Horwath 1489 ½ - ½
Mick Barker 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

496 = (1489 + 400 * (1 - 1)) / 3)

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