DWG-101.4.01
Sudoku #1 · Expert
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About this puzzle
Sheet #1 starts with 26 givens. Our solver completes it in 64 forced placements, 86% of them singles. Hardest step: XY-Wing.
Beyond singles, the solution path uses Pointing pair ×4, Naked pair ×4, XY-Wing ×1.
The givens are spread unevenly: box 3 holds 4 of them, box 1 only 1 (boxes are counted left to right, top to bottom).
Digit 2 is given most often, 4 times; digit 1 only 2 times.
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.