Step-by-Step Solution

for Thursday 17th September Fiendish

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

Single Candidate

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

Single Position

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

Single Position

For column 4, Number 5 is only possible in cell (4,9)

Single Position

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

Single Position

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

Single Position

For box 3, candidates for 1 are all in row 2, so you can remove candidates from other blocks.

Candidate Lines

For box 9, candidates for 4 are all in row 8, so you can remove candidates from other blocks.

Candidate Lines

For box 8, candidates for 3 are all in column 6, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 2 in boxes 4 and 5 force the candidates in box 6 to be in the remaining line.

Multiple Lines

Naked Triple for 4, 6 and 8, can remove these as candidates from other cells.

Naked Triples

Hidden Pair for 2 and 4, can remove other candidates from these cells.

Hidden Pairs

For box 6, Number 8 is only possible in cell (9,5)

Single Position

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

Single Candidate

Number 1 is the only value possible in cell (9,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 5, number 7 is only possible in cell (1,5)

Single Position

For row 8, number 7 is only possible in cell (2,8)

Single Position

For row 8, number 5 is only possible in cell (3,8)

Single Position

For row 1, number 5 is only possible in cell (8,1)

Single Position

For row 2, number 5 is only possible in cell (2,2)

Single Position

For row 4, number 2 is only possible in cell (6,4)

Single Position

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

Single Position

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

Single Candidate

Number 8 is the only value possible in cell (2,6).

Single Candidate

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

Single Position

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

Single Position

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

Single Candidate

Number 4 is the only value possible in cell (7,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 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 8 is the only value possible in cell (3,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (8,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (2,7).

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (1,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate