Step-by-Step Solution

for Sunday 27th July Diabolical

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (8,5).

Single Candidate

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

Single Candidate

For row 7, number 8 is only possible in cell (9,7)

Single Position

For row 3, number 8 is only possible in cell (7,3)

Single Position

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

Single Position

For row 6, number 2 is only possible in cell (9,6)

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 9, number 2 is only possible in cell (6,9)

Single Position

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

Candidate Lines

For box 4, candidates for 1 are all in column 1, so you can remove candidates from other blocks.

Candidate Lines

Hidden Pair for 6 and 8, can remove other candidates from these cells.

Hidden Pairs

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

Candidate Lines

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

Single Position

Candidates for 4 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Multiple Lines

Naked Triple for 1, 4 and 7, can remove these as candidates from other cells.

Naked Triples

Naked Pair for 3 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (2,7).

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (2,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 3, number 4 is only possible in cell (1,3)

Single Position

For column 1, Number 3 is only possible in cell (1,2)

Single Position

Hidden Pair for 1 and 7, can remove other candidates from these cells.

Hidden Pairs

X-Wing in rows for 3.

X-Wings

Either candidate for cell (3,1) forces 5 into cell (4,1).

Forcing Chains

Number 7 is the only value possible in cell (2,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (5,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate