Step-by-Step Solution

for Friday 3rd July Diabolical

For column 7, Number 6 is only possible in cell (7,5)

Single Position

For column 2, Number 6 is only possible in cell (2,6)

Single Position

For column 3, Number 6 is only possible in cell (3,8)

Single Position

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

Single Position

For row 6, number 4 is only possible in cell (9,6)

Single Position

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

Single Position

For column 7, Number 9 is only possible in cell (7,4)

Single Position

For column 8, Number 9 is only possible in cell (8,1)

Single Position

For column 7, Number 5 is only possible in cell (7,9)

Single Position

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

Single Position

For box 3, Number 3 is only possible in cell (7,2)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

For box 7, candidates for 1 are all in column 1, so you can remove candidates from other blocks.

Candidate Lines

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

Single Position

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

Multiple Lines

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (5,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For row 4, number 7 is only possible in cell (8,4)

Single Position

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

Hidden Pairs

X-Wing in rows for 8.

X-Wings

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

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (6,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate