Step-by-Step Solution

for Thursday 3rd September Fiendish

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

Single Position

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

Single Candidate

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

Single Position

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

Single Position

For row 6, number 2 is only possible in cell (8,6)

Single Position

For row 6, number 4 is only possible in cell (1,6)

Single Position

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

Single Position

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

Single Position

For row 3, number 2 is only possible in cell (5,3)

Single Position

For row 3, number 1 is only possible in cell (4,3)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For row 9, number 4 is only possible in cell (6,9)

Single Position

For row 9, number 2 is only possible in cell (1,9)

Single Position

For row 7, number 2 is only possible in cell (6,7)

Single Position

For column 5, Number 7 is only possible in cell (5,2)

Single Position

For box 8, Number 6 is only possible in cell (4,9)

Single Position

For column 4, Number 5 is only possible in cell (4,8)

Single Position

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

Candidate Lines

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

Multiple Lines

Naked Pair for 3 and 9, can remove these as candidates from other cells.

Naked Pairs

Hidden Pair for 5 and 7, can remove other candidates from these cells.

Hidden Pairs

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

Number 7 is the only value possible in cell (3,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (8,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate