For column 3, Number 9 is only possible in cell (3,6)

For column 4, Number 9 is only possible in cell (4,8)

For row 1, number 1 is only possible in cell (5,1)

For column 9, Number 1 is only possible in cell (9,6)

For column 4, Number 1 is only possible in cell (4,4)

For row 2, number 2 is only possible in cell (8,2)

For row 6, number 2 is only possible in cell (7,6)

For row 4, number 2 is only possible in cell (3,4)

For row 8, number 2 is only possible in cell (5,8)

For column 3, Number 3 is only possible in cell (3,9)

For row 8, number 3 is only possible in cell (6,8)

For column 6, Number 1 is only possible in cell (6,7)

For box 3, Number 3 is only possible in cell (7,3)

For row 1, number 4 is only possible in cell (2,1)

For row 3, number 4 is only possible in cell (5,3)

For row 9, number 4 is only possible in cell (8,9)

For row 4, number 4 is only possible in cell (6,4)

For row 5, number 4 is only possible in cell (9,5)

For row 5, number 9 is only possible in cell (8,5)

For row 7, number 9 is only possible in cell (7,7)

For row 1, number 9 is only possible in cell (9,1)

For box 6, Number 8 is only possible in cell (7,4)

Number 5 is the only value possible in cell (7,1).

Number 8 is the only value possible in cell (3,1).

For column 8, Number 5 is only possible in cell (8,7)

For box 7, candidates for 8 are all in column 1, so you can remove candidates from other blocks.

Number 5 is the only value possible in cell (1,5).

For row 6, number 5 is only possible in cell (6,6)

Number 8 is the only value possible in cell (6,2).

Number 6 is the only value possible in cell (9,2).

Number 7 is the only value possible in cell (4,3).

Number 3 is the only value possible in cell (4,2).

Number 5 is the only value possible in cell (5,2).

Number 7 is the only value possible in cell (3,2).

Number 8 is the only value possible in cell (9,3).

Number 8 is the only value possible in cell (4,6).

Number 3 is the only value possible in cell (5,5).

Number 8 is the only value possible in cell (2,5).

Number 6 is the only value possible in cell (3,7).

Number 5 is the only value possible in cell (3,3).

Number 6 is the only value possible in cell (2,3).

Number 3 is the only value possible in cell (2,6).

Number 7 is the only value possible in cell (2,4).

Number 6 is the only value possible in cell (1,4).

Number 3 is the only value possible in cell (8,4).

Number 6 is the only value possible in cell (8,6).

Number 8 is the only value possible in cell (5,7).

Number 7 is the only value possible in cell (1,7).

Number 1 is the only value possible in cell (1,8).

Number 5 is the only value possible in cell (2,8).

Number 6 is the only value possible in cell (7,8).

Number 8 is the only value possible in cell (1,9).

Number 6 is the only value possible in cell (5,9).

Number 1 is the only value possible in cell (7,9).