DWG-101.4.07
Sudoku #7 · Expert
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About this puzzle
Sheet #7 starts with 30 givens. Our solver completes it in 60 forced placements, 85% of them singles. Hardest step: XY-Wing.
Beyond singles, the solution path uses Pointing pair ×4, Naked pair ×2, Hidden pair ×1, XY-Wing ×2.
The givens are spread unevenly: box 5 holds 6 of them, box 3 only 1 (boxes are counted left to right, top to bottom).
Digit 5 is given most often, 5 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.