Expert sudoku 4

An expert nine by nine, at the bottom of the range for given numbers. It asks for the techniques with names — the ones you either know or look up — and it was graded by solving it with those techniques and nothing else: no guessing was needed to build it, so none is needed to finish it.

3796598485952917374683439
Show the answer key
837519246625734891491286735742853619153697428986421573378945162269178354514362987

What is on this sheet

Given numbers
25
Difficulty
Expert
Hardest step needed
Y-wing
Grid
9 × 9

About this puzzle

Expert means 22 to 26 given numbers, the smallest count on the site, and more than one hard step on the way through. It is still a logical puzzle from start to finish — every grid here was proved solvable by technique alone before being published — and the one answer prints on the second page.

This particular grid starts with 25 of the 81 numbers already printed, and the hardest technique it asks for is: Y-wing.

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