Step-by-Step Solution

for Tuesday 30th September Fiendish

For box 5, Number 1 is only possible in cell (6,6)

Single Position

For row 1, number 3 is only possible in cell (7,1)

Single Position

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

Single Position

For box 9, candidates for 8 are all in column 7, so you can remove candidates from other blocks.

Candidate Lines

For box 5, candidates for 3 are all in column 5, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Candidates for 7 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line.

Multiple Lines

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

Naked Pairs

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

Hidden Pairs

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

Candidate Lines

For box 4, candidates for 5 are all in column 1, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (1,3).

Single Candidate

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

Single Candidate

For row 3, number 1 is only possible in cell (8,3)

Single Position

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

Single Candidate

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

Single Candidate

For row 3, number 7 is only possible in cell (6,3)

Single Position

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

Single Position

For row 6, number 7 is only possible in cell (1,6)

Single Position

For row 4, number 7 is only possible in cell (8,4)

Single Position

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

Single Position

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

Single Position

For row 9, number 1 is only possible in cell (4,9)

Single Position

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

Single Position

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

Single Candidate

Number 4 is the only value possible in cell (8,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 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 (2,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (5,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate