Step-by-Step Solution

for Wednesday 24th December Fiendish

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 8, number 9 is only possible in cell (5,8)

Single Position

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

Single Position

For row 9, number 6 is only possible in cell (8,9)

Single Position

For row 7, number 6 is only possible in cell (4,7)

Single Position

For column 6, Number 2 is only possible in cell (6,3)

Single Position

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

Single Position

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

Candidate Lines

For box 2, candidates for 7 are all in column 4, so you can remove candidates from other blocks.

Candidate Lines

For box 8, candidates for 4 are all in column 6, so you can remove candidates from other blocks.

Candidate Lines

Naked Pair for 3 and 8, can remove these as candidates from other cells.

Naked Pairs

For column 5, Number 8 is only possible in cell (5,4)

Single Position

For box 4, candidates for 8 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Naked Pair for 2 and 3, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

Naked Pair for 2 and 3, can remove these as candidates from other cells.

Naked Pairs

Candidates for 2 in boxes 4 and 7 force the candidates in box 1 to be in the remaining line.

Multiple Lines

For row 2, number 2 is only possible in cell (3,2)

Single Position

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

Single Candidate

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

Single Candidate

For row 2, number 6 is only possible in cell (1,2)

Single Position

For row 6, number 6 is only possible in cell (9,6)

Single Position

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

Single Position

For row 5, number 1 is only possible in cell (9,5)

Single Position

For row 3, number 7 is only possible in cell (4,3)

Single Position

For column 1, Number 5 is only possible in cell (1,3)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (7,9).

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

For row 8, number 7 is only possible in cell (1,8)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (9,8).

Single Candidate