Event: Silver Rook

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Opponent Rating Result
Neil R Lowther 1895 ½ - ½
Bernie T Hare 1810 ½ - ½
Robert Mitchell 1691 0 - 1
Mohammad Abdulhamid 1758 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1789 = (7154 + 400 * (1 - 1)) / 4)

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