Step-by-Step Solution

for Tuesday 5th November Diabolical

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

Single Candidate

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

Single Candidate

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

Single Position

For box 9, Number 3 is only possible in cell (7,9)

Single Position

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

Single Position

For box 4, Number 2 is only possible in cell (1,5)

Single Position

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

Single Position

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

Single Position

For column 8, Number 1 is only possible in cell (8,7)

Single Position

For row 5, number 8 is only possible in cell (9,5)

Single Position

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

Single Position

For column 9, Number 5 is only possible in cell (9,1)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Position

For row 5, number 4 is only possible in cell (2,5)

Single Position

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

Single Position

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

Single Position

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

Single Position

For box 7, candidates for 8 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

Naked Pair for 8 and 9, can remove these as candidates from other cells.

Naked Pairs

Hidden Pair for 1 and 4, can remove other candidates from these cells.

Hidden Pairs

Either candidate for cell (1,2) forces 8 into cell (7,1).

Forcing Chains

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

Single Candidate

Either candidate for cell (1,2) forces 6 into cell (1,9).

Forcing Chains

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

Single Candidate

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

Single Position

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

Single Candidate

Number 9 is the only value possible in cell (3,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (4,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (8,6).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (4,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (5,8).

Single Candidate

Number 1 is the only value possible in cell (6,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate