Step-by-Step Solution

for Tuesday 13th October Fiendish

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

Single Candidate

For row 6, number 2 is only possible in cell (9,6)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For row 3, number 2 is only possible in cell (4,3)

Single Position

For row 3, number 8 is only possible in cell (6,3)

Single Position

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

Single Position

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

Single Position

Naked Pair for 3 and 6, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

Number 3 is the only value possible in cell (6,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (4,6).

Single Candidate

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

Single Position

For row 9, number 7 is only possible in cell (8,9)

Single Position

For column 5, Number 3 is only possible in cell (5,8)

Single Position

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

Multiple Lines

Naked Pair for 4 and 5, can remove these as candidates from other cells.

Naked Pairs

For box 9, candidates for 5 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

Hidden Pair for 2 and 8, can remove other candidates from these cells.

Hidden Pairs

Candidates for 6 in boxes 1 and 7 force the candidates in box 4 to be in the remaining line.

Multiple Lines

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (3,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (3,9).

Single Candidate

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

Single Candidate