For row 8, number 6 is only possible in cell (1,8)

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

For column 4, Number 1 is only possible in cell (4,7)

For row 7, number 5 is only possible in cell (6,7)

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

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

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

Number 7 is the only value possible in cell (6,9).

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

For row 3, number 6 is only possible in cell (7,3)

For box 8, candidates for 9 are all in row 9, so you can remove candidates from other blocks.

For box 3, candidates for 2 are all in row 3, so you can remove candidates from other blocks.

Hidden Pair for 3 and 4, can remove other candidates from these cells.

Candidates for 2 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Naked Triple for 2, 5 and 7, can remove these as candidates from other cells.

For column 4, Number 7 is only possible in cell (4,1)

Either candidate for cell (5,1) forces 8 into cell (5,8).

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

Number 4 is the only value possible in cell (7,8).

Number 3 is the only value possible in cell (7,9).

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

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

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

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

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

For column 7, Number 5 is only possible in cell (7,6)

For box 8, candidates for 4 are all in row 9, so you can remove candidates from other blocks.

For box 6, candidates for 8 are all in column 9, so you can remove candidates from other blocks.

Naked Pair for 2 and 8, can remove these as candidates from other cells.

X-Wing in rows for 7.

Either candidate for cell (9,7) forces 7 into cell (2,4).

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

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

Number 4 is the only value possible in cell (3,1).

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

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

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

Number 7 is the only value possible in cell (1,2).

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

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

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

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

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

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

Number 9 is the only value possible in cell (7,4).

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

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

Number 8 is the only value possible in cell (3,6).

Number 7 is the only value possible in cell (9,6).

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

Number 8 is the only value possible in cell (2,7).

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

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

Number 2 is the only value possible in cell (8,7).

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

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

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

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

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