DWG-101.4.04
Sudoku #4 · Expert
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About this puzzle
Sheet #4 starts with 28 givens. Our solver completes it in 57 forced placements, 93% of them singles. Hardest step: XYZ-Wing.
Beyond singles, the solution path uses Pointing pair ×2, XY-Wing ×1, XYZ-Wing ×1.
The givens are spread unevenly: box 5 holds 6 of them, box 2 only 2 (boxes are counted left to right, top to bottom).
Digit 4 is given most often, 5 times; digit 6 only once.
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.