Step-by-Step Solution

for Friday 2nd January Diabolical

Number 2 is the only value possible in cell (1,5).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (3,5).

Single Candidate

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

Single Candidate

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

Single Candidate

For row 2, number 1 is only possible in cell (7,2)

Single Position

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

Single Candidate

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

Single Candidate

For row 9, number 1 is only possible in cell (2,9)

Single Position

For row 7, number 1 is only possible in cell (6,7)

Single Position

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

Single Position

For row 6, number 8 is only possible in cell (4,6)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 4, number 7 is only possible in cell (9,4)

Single Position

Number 4 is the only value possible in cell (9,1).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (1,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

For row 2, number 8 is only possible in cell (5,2)

Single Position

X-Wing in rows for 9.

X-Wings

Either candidate for cell (2,7) forces 3 into cell (6,8).

Forcing Chains

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

Naked Pairs

Candidates for 2 in boxes 2 and 5 force the candidates in box 8 to be in the remaining line.

Multiple Lines

Either candidate for cell (2,3) forces 9 into cell (6,4).

Forcing Chains

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

Single Candidate

Either candidate for cell (8,7) forces 2 into cell (5,9).

Forcing Chains

Either candidate for cell (2,7) forces 5 into cell (8,9).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (6,2).

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (4,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (5,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate