For row 1, number 7 is only possible in cell (6,1)

For row 3, number 7 is only possible in cell (2,3)

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

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

For row 2, number 9 is only possible in cell (3,2)

For row 1, number 9 is only possible in cell (5,1)

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

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

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

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

For box 3, Number 6 is only possible in cell (7,1)

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

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

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

For row 4, number 3 is only possible in cell (1,4)

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

For row 5, number 3 is only possible in cell (7,5)

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

For box 1, candidates for 2 are all in column 1, so you can remove candidates from other blocks.

For blocks 4 and 6, candidates for 2 are all in the same two rows (5 and 6)

For blocks 3 and 6, candidates for 1 are all in the same two columns (9 and 8)

X-Wing in rows for 8.

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

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

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

Number 5 is the only value possible in cell (3,4).

Number 6 is the only value possible in cell (3,5).

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

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

Number 4 is the only value possible in cell (6,2).

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

Number 6 is the only value possible in cell (1,3).

Number 5 is the only value possible in cell (4,3).

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

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

Number 2 is the only value possible in cell (6,4).

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

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

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

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

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (7,6).

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

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

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

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

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

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

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

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