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

For column 1, Number 2 is only possible in cell (1,7)

For row 1, number 8 is only possible in cell (7,1)

For column 7, Number 1 is only possible in cell (7,3)

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

For column 6, Number 6 is only possible in cell (6,4)

Candidates for 5 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Number 8 is the only value possible in cell (2,4).

Naked Pair for 4 and 5, can remove these as candidates from other cells.

X-Wing in rows for 9.

X-Wing in columns for 4.

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

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

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

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

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

Number 6 is the only value possible in cell (7,5).

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

For row 3, number 7 is only possible in cell (9,3)

For row 4, number 7 is only possible in cell (4,4)

For row 2, number 6 is only possible in cell (3,2)

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

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

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

For column 8, Number 3 is only possible in cell (8,1)

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

For row 9, number 4 is only possible in cell (3,9)

Number 5 is the only value possible in cell (3,8).

Number 2 is the only value possible in cell (3,1).

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

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

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

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

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

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

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

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

Number 5 is the only value possible in cell (7,4).

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

Number 2 is the only value possible in cell (9,4).

Number 5 is the only value possible in cell (1,6).

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

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

Number 1 is the only value possible in cell (5,6).

Number 9 is the only value possible in cell (8,6).

Number 4 is the only value possible in cell (9,6).

Number 8 is the only value possible in cell (3,7).

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

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

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

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

Number 2 is the only value possible in cell (4,8).

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

Number 9 is the only value possible in cell (7,8).

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

Number 5 is the only value possible in cell (4,9).

Number 8 is the only value possible in cell (5,9).