DWG-101.4.12
Sudoku #12 · Expert
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About this puzzle
Sheet #12 starts with 28 givens. Our solver completes it in 60 forced placements, 88% of them singles. Hardest step: XYZ-Wing.
Beyond singles, the solution path uses Pointing pair ×4, Naked pair ×2, XYZ-Wing ×1.
The givens are spread unevenly: box 4 holds 5 of them, box 3 only 1 (boxes are counted left to right, top to bottom).
Digit 1 is given most often, 4 times; digit 8 only 2 times.
Row 2 starts completely empty.
Where to start
Like the XY-Wing, but the pivot holds all three candidates XYZ. Z can be removed from cells that see the pivot and both wings.