Step-by-Step Solution

for Friday 21st February Fiendish

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (3,5).

Single Candidate

For row 9, number 4 is only possible in cell (3,9)

Single Position

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

Single Position

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

Single Position

For box 1, candidates for 6 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

For box 2, candidates for 7 are all in row 2, so you can remove candidates from other blocks.

Candidate Lines

For box 3, candidates for 5 are all in row 2, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 9 in boxes 2 and 3 force the candidates in box 1 to be in the remaining line.

Multiple Lines

X-Wing in rows for 6.

X-Wings

For row 1, number 6 is only possible in cell (3,1)

Single Position

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

Single Position

For row 2, number 6 is only possible in cell (8,2)

Single Position

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

Single Position

For row 9, number 5 is only possible in cell (4,9)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (7,1).

Single Candidate

Number 2 is the only value possible in cell (6,1).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 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 (6,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (9,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (5,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (6,8).

Single Candidate

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

Single Candidate

For row 8, number 6 is only possible in cell (2,8)

Single Position

For column 2, Number 9 is only possible in cell (2,3)

Single Position

Number 7 is the only value possible in cell (1,3).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (8,7).

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (2,4).

Single Candidate

Number 7 is the only value possible in cell (3,4).

Single Candidate

Number 2 is the only value possible in cell (5,4).

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (3,6).

Single Candidate

Number 2 is the only value possible in cell (1,6).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (3,8).

Single Candidate

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

Single Candidate