Step-by-Step Solution

for Sunday 13th July Diabolical

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 1, number 5 is only possible in cell (9,1)

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 9, number 1 is only possible in cell (7,9)

Single Position

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

Single Position

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

Single Position

For row 1, number 8 is only possible in cell (7,1)

Single Position

For column 9, Number 8 is only possible in cell (9,6)

Single Position

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

Single Position

Number 1 is the only value possible in cell (4,3).

Single Candidate

For row 5, number 6 is only possible in cell (7,5)

Single Position

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

Single Position

For row 3, number 6 is only possible in cell (8,3)

Single Position

For box 6, Number 3 is only possible in cell (9,5)

Single Position

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

Single Position

For box 3, candidates for 9 are all in row 2, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

Naked Pair for 2 and 9, can remove these as candidates from other cells.

Naked Pairs

Naked Pair for 2 and 7, can remove these as candidates from other cells.

Naked Pairs

Hidden Pair for 3 and 5, can remove other candidates from these cells.

Hidden Pairs

Naked Triple for 2, 6 and 7, can remove these as candidates from other cells.

Naked Triples

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

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (6,3).

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (6,4).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (2,4).

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (3,6).

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (1,4).

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (4,6).

Single Candidate

Number 3 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate