Expert Sudoku
Expert Sudoku is sparse enough that single-cell deductions dry up early. Progress comes from chaining eliminations across a row and a box together, and from trusting notes you wrote twenty moves ago.
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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