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

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

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

For row 1, number 2 is only possible in cell (6,1)

For row 9, number 2 is only possible in cell (1,9)

For column 2, Number 2 is only possible in cell (2,6)

For row 1, number 8 is only possible in cell (4,1)

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

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

For row 3, number 8 is only possible in cell (1,3)

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

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

For row 4, number 8 is only possible in cell (5,4)

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

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

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

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

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

For box 4, candidates for 9 are all in column 1, so you can remove candidates from other blocks.

For box 4, candidates for 4 are all in column 1, so you can remove candidates from other blocks.

Naked Triple for 3, 4 and 6, can remove these as candidates from other cells.

Swordfish in columns for 6.

Either candidate for cell (4,7) forces 2 into cell (8,8).

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

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

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

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

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

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

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

Number 4 is the only value possible in cell (1,6).

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

Number 6 is the only value possible in cell (8,7).

Number 5 is the only value possible in cell (1,7).

Number 6 is the only value possible in cell (1,2).

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

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

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

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

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

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

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

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

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

Number 9 is the only value possible in cell (5,6).

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

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

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

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

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

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

Number 6 is the only value possible in cell (3,9).

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

Number 3 is the only value possible in cell (6,9).

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