Step-by-Step Solution

for Sunday 12th January Diabolical

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 4, number 9 is only possible in cell (5,4)

Single Position

For box 1, Number 9 is only possible in cell (3,1)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Position

For box 4, candidates for 3 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

For box 2, candidates for 5 are all in row 3, so you can remove candidates from other blocks.

Candidate Lines

For box 2, candidates for 7 are all in row 3, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Candidates for 5 in boxes 5 and 6 force the candidates in box 4 to be in the remaining line.

Multiple Lines

Candidates for 2 in boxes 5 and 6 force the candidates in box 4 to be in the remaining line.

Multiple Lines

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

Single Candidate

Either candidate for cell (7,2) forces 2 into cell (8,5).

Forcing Chains

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

Single Candidate

Number 7 is the only value possible in cell (5,3).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (8,3).

Single Candidate

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

Single Candidate

Either candidate for cell (1,1) forces 3 into cell (3,8).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (2,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (7,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (5,9).

Single Candidate

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

Single Candidate

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

Single Candidate