Tag Archives: Extremely Hard v.10

Closing With the Hidden Dublex

This closing post adds two examples of a fierce looking line marking being de-fanged by hidden dublex on the over abundant X values A double line exclusion, or dublex, is one of the primary moves of Basic sudoku, in which … Continue reading

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Colorful Trials for Bean’s Extremely Hard v.10

This post calls on pattern directed coloring trials to solve IV-24, a puzzle in Rebecca Bean’s Extremely Hard, vol. 10. This one that seems to defy almost all advanced methods, and therefore, to deserve the rank of “extreme”. This also … Continue reading

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