Tough Sudoku #311961 | Peak Sudoku

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81 leftNo cell selected

Puzzle: #311961
Difficulty: Tough(70/100)SE 4.1
Clues: 26
Symmetry: Vertical mirror

1–9 writes into the selected cells.

Techniques in this puzzle7

Naked Single×11 Hidden Single×6 Pointing Pair×3 Claiming×2 Naked Pair×1 Naked Quad×1 XY-Chain×1

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Tough Sudoku #311961 | Peak Sudoku