Step-by-Step Solution

for Thursday 2nd January Diabolical

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

Single Position

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

Single Position

For row 1, number 2 is only possible in cell (7,1)

Single Position

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

Single Position

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

Single Position

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

Single Position

For column 6, Number 2 is only possible in cell (6,9)

Single Position

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

Single Position

For row 5, number 8 is only possible in cell (6,5)

Single Position

For box 3, candidates for 1 are all in row 3, so you can remove candidates from other blocks.

Candidate Lines

For box 9, candidates for 7 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

For box 5, candidates for 6 are all in column 4, so you can remove candidates from other blocks.

Candidate Lines

For box 9, candidates for 6 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

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

Naked Pairs

Hidden Pair for 6 and 7, can remove other candidates from these cells.

Hidden Pairs

Hidden Pair for 3 and 6, can remove other candidates from these cells.

Hidden Pairs

Candidates for 4 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Multiple Lines

Candidates for 5 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Multiple Lines

Hidden Pair for 3 and 5, can remove other candidates from these cells.

Hidden Pairs

For column 1, Number 4 is only possible in cell (1,8)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (8,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (2,7).

Single Candidate

For row 4, number 9 is only possible in cell (2,4)

Single Position

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

Single Position

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

Single Position

Number 5 is the only value possible in cell (1,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (6,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (3,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (2,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate