Step-by-Step Solution

for Thursday 17th July Fiendish

Number 6 is the only value possible in cell (7,1).

Single Candidate

For column 1, Number 3 is only possible in cell (1,7)

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 9, number 3 is only possible in cell (9,9)

Single Position

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

Single Position

For box 2, candidates for 8 are all in row 3, so you can remove candidates from other blocks.

Candidate Lines

For box 6, candidates for 2 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

For box 6, candidates for 5 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

For box 7, candidates for 1 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

Naked Pair for 1 and 6, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Position

For column 9, Number 6 is only possible in cell (9,7)

Single Position

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

Single Candidate

For box 8, candidates for 4 are all in column 5, so you can remove candidates from other blocks.

Candidate Lines

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

For row 1, number 2 is only possible in cell (8,1)

Single Position

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

Single Position

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

Candidate Lines

Candidates for 4 in boxes 2 and 3 force the candidates in box 1 to be in the remaining line.

Multiple Lines

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

Multiple Lines

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (5,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (5,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate