Dog Sudoku Level 166 Hint
Find a bone with only two or three available neighboring cells, then test those cells against the row count, column count, and no-touch rule.
Dog Sudoku Level 166 Strategy
Hard Level 166 uses a 9x9 board with 10 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 166 Solution
Solution dog cells: R1C2, R2C8, R3C1, R3C6, R5C4, R6C2, R7C5, R7C9, R8C2, R9C7.