Step-by-Step Solution

for Thursday 12th February Fiendish

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

Single Position

For row 9, number 5 is only possible in cell (3,9)

Single Position

For row 2, number 5 is only possible in cell (9,2)

Single Position

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

Single Position

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 9, number 8 is only possible in cell (2,9)

Single Position

For row 6, number 8 is only possible in cell (1,6)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 8, number 1 is only possible in cell (3,8)

Single Position

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 6 and 9, can remove these as candidates from other cells.

Naked Pairs

Naked Pair for 3 and 9, can remove these as candidates from other cells.

Naked Pairs

X-Wing in columns for 9.

X-Wings

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (6,7).

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (4,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (8,1).

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (5,4).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (5,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (1,8).

Single Candidate

Number 2 is the only value possible in cell (7,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate