Step-by-Step Solution

for Friday 15th November Fiendish

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

Single Candidate

For row 3, number 5 is only possible in cell (7,3)

Single Position

For row 6, number 5 is only possible in cell (9,6)

Single Position

For column 9, Number 7 is only possible in cell (9,4)

Single Position

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

Single Position

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

Single Position

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

Candidate Lines

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

Candidate Lines

For box 1, candidates for 9 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

For blocks 4 and 5, candidates for 4 are all in the same two rows (4 and 6)

Double Pairs

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

Naked Pairs

Candidates for 3 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Multiple Lines

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

Multiple Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 1, number 7 is only possible in cell (4,1)

Single Position

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

Single Position

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

Single Position

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

Candidate Lines

For blocks 5 and 8, candidates for 6 are all in the same two columns (5 and 6)

Double Pairs

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (8,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (6,4).

Single Candidate

Number 2 is the only value possible in cell (8,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (3,7).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (5,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 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 1 is the only value possible in cell (6,9).

Single Candidate

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

Single Candidate

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

Single Candidate