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

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

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

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

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

For row 2, number 3 is only possible in cell (1,2)

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

For row 5, number 3 is only possible in cell (8,5)

For box 6, Number 7 is only possible in cell (9,5)

For row 6, number 5 is only possible in cell (4,6)

For box 2, Number 4 is only possible in cell (6,3)

For column 6, Number 5 is only possible in cell (6,1)

For box 3, candidates for 8 are all in column 8, so you can remove candidates from other blocks.

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

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

For box 3, candidates for 6 are all in column 9, so you can remove candidates from other blocks.

For box 6, candidates for 4 are all in row 6, so you can remove candidates from other blocks.

Naked Pair for 1 and 7, can remove these as candidates from other cells.

X-Wing in columns for 6.

X-Wing in rows for 1.

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

For row 5, number 1 is only possible in cell (6,5)

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

Either candidate for cell (3,3) forces 1 into cell (9,3).

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

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

Number 7 is the only value possible in cell (5,2).

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

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

Number 1 is the only value possible in cell (5,8).

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

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

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

Number 1 is the only value possible in cell (2,9).

For row 8, number 6 is only possible in cell (7,8)

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

X-Wing in rows for 2.

Either candidate for cell (1,5) forces 6 into cell (3,3).

Number 8 is the only value possible in cell (2,3).

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

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

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

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

Number 8 is the only value possible in cell (1,4).

Number 2 is the only value possible in cell (5,4).

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

Number 2 is the only value possible in cell (1,5).

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

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

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

Number 8 is the only value possible in cell (5,6).

Number 4 is the only value possible in cell (7,6).

Number 5 is the only value possible in cell (7,2).

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

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

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

Number 5 is the only value possible in cell (2,7).

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

Number 2 is the only value possible in cell (3,8).

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