Step-by-Step Solution

for Thursday 4th September Diabolical

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

Single Candidate

For column 3, Number 6 is only possible in cell (3,6)

Single Position

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

Single Position

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

Single Position

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

Single Position

For column 4, Number 9 is only possible in cell (4,4)

Single Position

For row 6, number 7 is only possible in cell (2,6)

Single Position

For row 6, number 1 is only possible in cell (8,6)

Single Position

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

Candidate Lines

For box 5, candidates for 2 are all in row 6, so you can remove candidates from other blocks.

Candidate Lines

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

Single Candidate

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

Single Candidate

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

Candidate Lines

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

Multiple Lines

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

Multiple Lines

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

Hidden Pairs

For column 8, Number 3 is only possible in cell (8,3)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

X-Wing in rows for 7.

X-Wings

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

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 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 6 is the only value possible in cell (7,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 1, number 5 is only possible in cell (4,1)

Single Position

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

Single Position

X-Wing in rows for 1.

X-Wings

Either candidate for cell (2,1) forces 5 into cell (3,5).

Forcing Chains

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (1,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (4,9).

Single Candidate

Number 7 is the only value possible in cell (6,9).

Single Candidate