Medium Sudoku
Medium Sudoku still yields to scanning for the first half, then slows down. This is where writing candidates into cells starts to pay off, and where the last-remaining-cell rule does a lot of the work for you.
Strategy1 min read
X-Wing and Swordfish, explained without the jargon
Two pattern-based Sudoku techniques that unstick expert grids — what they are, how to spot them, and when they are worth the effort.
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