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Sudoku’s XY-Wing uses three cells (XY, XZ, YZ) to eliminate Z—what’s the trickiest XY-Wing you applied (hidden cell positions, or multiple wings), and how did you link the three cells? Did you ever use an XY-Wing to solve a “very hard” Sudoku, and what’s the most advanced pattern-moment you had?
Posted : September 21, 2025 6:20 pm