Step-by-Step Solution

for Friday 18th July Diabolical

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

Single Position

For box 2, Number 1 is only possible in cell (5,3)

Single Position

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

Single Position

For row 9, number 8 is only possible in cell (4,9)

Single Position

For column 8, Number 8 is only possible in cell (8,5)

Single Position

For column 6, Number 3 is only possible in cell (6,1)

Single Position

For row 5, number 2 is only possible in cell (7,5)

Single Position

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

Single Position

For row 3, number 6 is only possible in cell (9,3)

Single Position

For box 3, Number 2 is only possible in cell (8,1)

Single Position

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

Candidate Lines

For box 2, candidates for 5 are all in column 4, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For column 7, Number 5 is only possible in cell (7,4)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (4,5).

Single Candidate

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

Single Candidate

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

Single Position

For column 4, Number 9 is only possible in cell (4,6)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 7, number 5 is only possible in cell (9,7)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

Candidates for 7 in boxes 2 and 3 force the candidates in box 1 to be in the remaining line.

Multiple Lines

Hidden Pair for 2 and 3, can remove other candidates from these cells.

Hidden Pairs

Either candidate for cell (1,1) forces 4 into cell (8,2).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (2,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (1,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate