Step-by-Step Solution

for Saturday 24th January Fiendish

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For row 3, number 9 is only possible in cell (1,3)

Single Position

For row 5, number 8 is only possible in cell (1,5)

Single Position

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

Candidate Lines

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

Candidate Lines

For box 4, candidates for 2 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

For box 9, candidates for 7 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

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

Naked Pairs

Candidates for 9 in boxes 4 and 6 force the candidates in box 5 to be in the remaining line.

Multiple Lines

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

Multiple Lines

Naked Pair for 1 and 2, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

For column 6, Number 1 is only possible in cell (6,7)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (8,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (2,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (8,3).

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (9,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (9,7).

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (9,2).

Single Candidate

Number 2 is the only value possible in cell (4,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (1,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (6,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (5,9).

Single Candidate

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

Single Candidate