Step-by-Step Solution

for Saturday 31st October Fiendish

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

Single Candidate

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

Single Candidate

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

Single Position

For row 5, number 1 is only possible in cell (2,5)

Single Position

For row 9, number 1 is only possible in cell (8,9)

Single Position

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

Single Position

For column 1, Number 2 is only possible in cell (1,1)

Single Position

For row 2, number 6 is only possible in cell (7,2)

Single Position

For box 7, Number 6 is only possible in cell (1,9)

Single Position

For row 5, number 6 is only possible in cell (8,5)

Single Position

For box 7, candidates for 4 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

For box 1, candidates for 4 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

For box 9, candidates for 3 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

For box 1, candidates for 7 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

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

Single Candidate

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

Single Position

For column 1, Number 3 is only possible in cell (1,7)

Single Position

Candidates for 8 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Multiple Lines

Naked Pair for 7 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

Naked Pair for 5 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 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 3 is the only value possible in cell (6,2).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (1,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate