Step-by-Step Solution

for Sunday 20th July Fiendish

For column 6, Number 2 is only possible in cell (6,9)

Single Position

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

Single Position

For row 6, number 3 is only possible in cell (5,6)

Single Position

For box 7, Number 8 is only possible in cell (3,8)

Single Position

For box 6, candidates for 8 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

For box 3, candidates for 2 are all in row 2, 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

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

Candidate Lines

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

Candidate Lines

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

Candidate Lines

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

Naked Pairs

For column 8, Number 7 is only possible in cell (8,9)

Single Position

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

Single Position

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

Single Position

For box 8, Number 6 is only possible in cell (5,7)

Single Position

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

Single Position

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

Candidate Lines

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

Multiple Lines

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

Multiple Lines

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

Single Candidate

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

Single Candidate

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

Single Position

For column 2, Number 2 is only possible in cell (2,3)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Position

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

Single Position

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

Single Position

For box 4, candidates for 6 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 9 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.

Multiple Lines

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

Single Candidate

Number 7 is the only value possible in cell (6,4).

Single Candidate

Number 2 is the only value possible in cell (7,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (3,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (9,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate