DWG-101.3.05
Sudoku #5 · Hard
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About this puzzle
Sheet #5 starts with 28 givens. Our solver completes it in 54 forced placements, 98% of them singles. Hardest step: Pointing pair.
Beyond singles, the solution path uses Pointing pair ×1.
The givens are spread unevenly: box 1 holds 5 of them, box 3 only 1 (boxes are counted left to right, top to bottom).
Digit 1 is given most often, 5 times; digit 3 only 2 times.
Where to start
Somewhere a digit is confined to one row or column inside a box. Use that to clear the digit from the rest of the line.