Step-by-Step Solution

for Saturday 19th July Diabolical

For row 4, number 1 is only possible in cell (2,4)

Single Position

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

Single Position

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

Single Position

For column 7, Number 8 is only possible in cell (7,9)

Single Position

For row 6, number 7 is only possible in cell (8,6)

Single Position

For row 8, number 7 is only possible in cell (5,8)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 3, number 7 is only possible in cell (4,3)

Single Position

For row 1, number 7 is only possible in cell (3,1)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

For column 9, Number 9 is only possible in cell (9,5)

Single Position

For row 3, number 4 is only possible in cell (5,3)

Single Position

For row 1, number 4 is only possible in cell (7,1)

Single Position

For row 7, number 4 is only possible in cell (3,7)

Single Position

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

Single Position

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

Single Position

For row 6, number 4 is only possible in cell (2,6)

Single Position

For column 2, Number 9 is only possible in cell (2,2)

Single Position

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

Single Position

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

Candidate Lines

For box 9, candidates for 5 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 2 in boxes 5 and 6 force the candidates in box 4 to be in the remaining line.

Multiple Lines

Either candidate for cell (3,2) forces 3 into cell (9,4).

Forcing Chains

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

Single Candidate

Number 3 is the only value possible in cell (7,8).

Single Candidate

For row 1, number 3 is only possible in cell (5,1)

Single Position

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

Single Position

Either candidate for cell (4,1) forces 8 into cell (3,4).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (9,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (2,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (1,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate