Step-by-Step Solution

for Monday 2nd December Fiendish

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

Single Position

For column 5, Number 8 is only possible in cell (5,2)

Single Position

For row 3, number 8 is only possible in cell (9,3)

Single Position

For column 2, Number 5 is only possible in cell (2,3)

Single Position

For row 2, number 3 is only possible in cell (7,2)

Single Position

For row 6, number 3 is only possible in cell (2,6)

Single Position

For row 4, number 3 is only possible in cell (8,4)

Single Position

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

Single Position

For row 8, number 3 is only possible in cell (4,8)

Single Position

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

Single Position

Number 1 is the only value possible in cell (5,9).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For box 1, candidates for 9 are all in column 1, so you can remove candidates from other blocks.

Candidate Lines

For box 8, candidates for 9 are all in column 6, so you can remove candidates from other blocks.

Candidate Lines

For box 8, candidates for 2 are all in column 6, so you can remove candidates from other blocks.

Candidate Lines

For box 9, candidates for 6 are all in column 7, so you can remove candidates from other blocks.

Candidate Lines

Naked Pair for 1 and 7, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

Naked Pair for 2 and 9, can remove these as candidates from other cells.

Naked Pairs

Naked Pair for 1 and 9, can remove these as candidates from other cells.

Naked Pairs

For box 2, Number 1 is only possible in cell (6,3)

Single Position

Hidden Pair for 4 and 8, can remove other candidates from these cells.

Hidden Pairs

For column 3, Number 7 is only possible in cell (3,8)

Single Position

Number 6 is the only value possible in cell (1,9).

Single Candidate

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

Single Candidate

For row 5, number 7 is only possible in cell (8,5)

Single Position

Number 1 is the only value possible in cell (9,6).

Single Candidate

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

Single Candidate

For row 1, number 7 is only possible in cell (9,1)

Single Position

For row 8, number 6 is only possible in cell (7,8)

Single Position

For row 1, number 5 is only possible in cell (4,1)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (9,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (8,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (8,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate