Step-by-Step Solution

for Saturday 12th July Diabolical

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

Single Candidate

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

Single Candidate

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

Single Candidate

For column 4, Number 6 is only possible in cell (4,3)

Single Position

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

Single Position

For column 1, Number 5 is only possible in cell (1,4)

Single Position

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

Single Position

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

Single Position

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

Single Candidate

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

Single Position

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

Candidate Lines

For box 4, candidates for 8 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

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

Candidate Lines

For box 2, candidates for 7 are all in column 5, so you can remove candidates from other blocks.

Candidate Lines

Hidden Triple for 3, 8 and 9, can remove other candidates from these cells.

Hidden Triples

X-Wing in rows for 6.

X-Wings

Either candidate for cell (6,1) forces 1 into cell (9,1).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

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

Single Position

For row 8, number 9 is only possible in cell (3,8)

Single Position

For row 8, number 4 is only possible in cell (2,8)

Single Position

For column 3, Number 4 is only possible in cell (3,5)

Single Position

For column 2, Number 1 is only possible in cell (2,7)

Single Position

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

Single Position

For box 4, candidates for 7 are all in row 6, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 2 in boxes 1 and 2 force the candidates in box 3 to be in the remaining line.

Multiple Lines

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

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (2,9).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (2,5).

Single Candidate

Number 2 is the only value possible in cell (8,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate