DWG-101.4.09
Sudoku #9 · Expert
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About this puzzle
Sheet #9 starts with 28 givens. Our solver completes it in 60 forced placements, 88% of them singles. Hardest step: XY-Wing.
Beyond singles, the solution path uses Pointing pair ×3, Box–line reduction ×1, Naked pair ×1, Hidden pair ×1, XY-Wing ×1.
The givens are spread unevenly: box 4 holds 4 of them, box 5 only 2 (boxes are counted left to right, top to bottom).
Digit 3 is given most often, 4 times; digit 2 only once.
Where to start
Find a pivot cell with candidates XY that sees one cell with XZ and another with YZ. Any cell that sees both wings cannot be Z.