For row 8, number 9 is only possible in cell (7,8)

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

For row 9, number 3 is only possible in cell (5,9)

For column 7, Number 3 is only possible in cell (7,4)

For row 1, number 4 is only possible in cell (5,1)

For column 4, Number 5 is only possible in cell (4,7)

For column 8, Number 8 is only possible in cell (8,1)

For column 4, Number 8 is only possible in cell (4,5)

For row 5, number 3 is only possible in cell (1,5)

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

For row 6, number 3 is only possible in cell (4,6)

For row 3, number 5 is only possible in cell (9,3)

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

Number 5 is the only value possible in cell (7,9).

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

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

For row 2, number 6 is only possible in cell (4,2)

For row 1, number 6 is only possible in cell (1,1)

For row 9, number 6 is only possible in cell (9,9)

For column 9, Number 7 is only possible in cell (9,7)

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

Number 4 is the only value possible in cell (1,7).

Number 1 is the only value possible in cell (8,7).

Number 4 is the only value possible in cell (8,9).

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

For row 9, number 8 is only possible in cell (1,9)

For row 4, number 1 is only possible in cell (9,4)

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

For row 6, number 4 is only possible in cell (9,6)

Candidates for 7 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Either candidate for cell (4,1) forces 9 into cell (9,1).

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

Number 9 is the only value possible in cell (8,4).

Number 2 is the only value possible in cell (9,5).

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

Either candidate for cell (1,3) forces 7 into cell (1,4).

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

Number 7 is the only value possible in cell (4,1).

Number 9 is the only value possible in cell (5,2).

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

Number 2 is the only value possible in cell (5,3).

Number 9 is the only value possible in cell (1,3).

Number 2 is the only value possible in cell (1,6).

Number 5 is the only value possible in cell (2,6).

Number 2 is the only value possible in cell (2,1).

Number 5 is the only value possible in cell (3,1).

Number 9 is the only value possible in cell (3,6).

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

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

Number 1 is the only value possible in cell (2,8).

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

Number 7 is the only value possible in cell (2,9).

Number 2 is the only value possible in cell (3,9).

Number 1 is the only value possible in cell (6,9).