DWG-101.4.05
Sudoku #5 · Expert
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About this puzzle
Sheet #5 starts with 28 givens. Our solver completes it in 57 forced placements, 93% of them singles. Hardest step: XY-Wing.
Beyond singles, the solution path uses Naked pair ×2, X-Wing ×1, XY-Wing ×1.
The givens are spread unevenly: box 4 holds 5 of them, box 5 only 0 (boxes are counted left to right, top to bottom).
Digit 1 is given most often, 5 times; digit 9 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.