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

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

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

Number 1 is the only value possible in cell (9,4).

Number 6 is the only value possible in cell (3,4).

Number 8 is the only value possible in cell (2,5).

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

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

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

Number 4 is the only value possible in cell (1,5).

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

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

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

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

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

For row 9, number 7 is only possible in cell (1,9)

For row 9, number 6 is only possible in cell (5,9)

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

For row 3, number 6 is only possible in cell (1,3)

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

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

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

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

For row 1, number 5 is only possible in cell (7,1)

For row 2, number 5 is only possible in cell (3,2)

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

For row 8, number 2 is only possible in cell (1,8)

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

Either candidate for cell (6,8) forces 8 into cell (4,6).

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

Either candidate for cell (6,3) forces 9 into cell (9,8).

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

Number 9 is the only value possible in cell (5,1).

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

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

Number 1 is the only value possible in cell (8,3).

For row 7, number 1 is only possible in cell (3,7)

X-Wing in rows for 8.

Either candidate for cell (4,2) forces 4 into cell (9,3).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 4 is the only value possible in cell (3,9).

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