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Tag Archives: hidden unique rectangle
Only Extreme 304 is AIC Level
This post and the next update Castillo’s Only Extreme Sudoku review with a solution of OnEx 304 without trials. Most of the solution path is in AIC building, the most challenging level of Sysudoku Advanced. The only move prior to … Continue reading
Beyond the Rectangle
The alternative deadly uniqueness formations of the Sudocue Guide are detailed in this post. Also, there is a UR checkpoint on Sheldon’s Master Class # 3 that goes beyond the UR cases surveyed in recent posts. I can’t leave the … Continue reading
Posted in Advanced Solving
Tagged avoidable UR, bi-value grave, hidden unique rectangle, hidden UR, NUR, unique rectangle, UR
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Stuart’s Hidden UR
In Logic of Sudoku, Andrew Stuart describes a unique rectangle with only one bv corner. The tell-tale naked pair is not there. Stuart calls this formation a hidden UR, with good reason. You have to find the bv candidates in … Continue reading
Posted in Advanced Solving, Expert Reviews, Stuart
Tagged hidden unique rectangle, hidden UR, unique rectangle, UR
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