Step-by-Step Solution

for Tuesday 19th November Diabolical

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

Single Candidate

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

Single Position

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

Single Position

For row 6, number 9 is only possible in cell (5,6)

Single Position

For column 9, Number 2 is only possible in cell (9,1)

Single Position

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

Single Position

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

Single Position

For row 1, number 3 is only possible in cell (5,1)

Single Position

For row 2, number 3 is only possible in cell (8,2)

Single Position

For column 5, Number 5 is only possible in cell (5,4)

Single Position

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

Single Position

For column 1, Number 8 is only possible in cell (1,9)

Single Position

For column 2, Number 8 is only possible in cell (2,1)

Single Position

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

Candidate Lines

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

Candidate Lines

For box 4, candidates for 3 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

For box 4, candidates for 6 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 7 in boxes 5 and 6 force the candidates in box 4 to be in the remaining line.

Multiple Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (2,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (7,2).

Single Candidate

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

Single Candidate

For row 9, number 4 is only possible in cell (3,9)

Single Position

Hidden Pair for 1 and 3, can remove other candidates from these cells.

Hidden Pairs

Either candidate for cell (5,7) forces 2 into cell (5,9).

Forcing Chains

Either candidate for cell (7,7) forces 8 into cell (6,7).

Forcing Chains

Number 2 is the only value possible in cell (6,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (4,8).

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (8,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate