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

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

For row 4, number 7 is only possible in cell (6,4)

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

For column 5, Number 7 is only possible in cell (5,3)

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

For row 2, number 3 is only possible in cell (4,2)

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

For column 8, Number 3 is only possible in cell (8,4)

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

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

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

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

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

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

For column 8, Number 8 is only possible in cell (8,5)

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

Number 2 is the only value possible in cell (3,4).

Either candidate for cell (1,1) forces 8 into cell (2,6).

Number 7 is the only value possible in cell (1,6).

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

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

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

For blocks 6 and 9, candidates for 1 are all in the same two columns (7 and 9)

Either candidate for cell (5,7) forces 2 into cell (1,7).

For column 2, Number 2 is only possible in cell (2,1)

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

For row 7, number 4 is only possible in cell (6,7)

Number 9 is the only value possible in cell (6,8).

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

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

Number 6 is the only value possible in cell (5,1).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Number 2 is the only value possible in cell (9,8).

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

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

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

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

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