Step-by-Step Solution

for Wednesday 3rd September Diabolical

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

Single Candidate

For column 8, Number 9 is only possible in cell (8,7)

Single Position

For row 1, number 6 is only possible in cell (5,1)

Single Position

For row 4, number 6 is only possible in cell (9,4)

Single Position

For row 5, number 6 is only possible in cell (1,5)

Single Position

For box 9, Number 5 is only possible in cell (7,8)

Single Position

For column 2, Number 4 is only possible in cell (2,3)

Single Position

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

Single Candidate

For column 2, Number 5 is only possible in cell (2,9)

Single Position

For column 3, Number 5 is only possible in cell (3,2)

Single Position

For box 2, Number 8 is only possible in cell (6,1)

Single Position

For column 6, Number 9 is only possible in cell (6,5)

Single Position

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

Single Position

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

Single Position

For box 4, candidates for 8 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

For column 8, Number 8 is only possible in cell (8,6)

Single Position

For column 7, Number 8 is only possible in cell (7,2)

Single Position

For box 9, candidates for 4 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Number 7 is the only value possible in cell (1,8).

Single Candidate

For box 9, candidates for 3 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

For column 6, Number 7 is only possible in cell (6,9)

Single Position

X-Wing in rows for 2.

X-Wings

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

Single Candidate

Either candidate for cell (2,4) forces 7 into cell (8,4).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (4,2).

Single Candidate

Number 5 is the only value possible in cell (4,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 5, number 7 is only possible in cell (3,5)

Single Position

For row 5, number 8 is only possible in cell (2,5)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Candidate

Number 1 is the only value possible in cell (9,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (1,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 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 8 is the only value possible in cell (9,7).

Single Candidate

Number 1 is the only value possible in cell (3,7).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (9,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate