Step-by-Step Solution

for Friday 18th September Fiendish

For row 5, number 5 is only possible in cell (9,5)

Single Position

For row 2, number 1 is only possible in cell (3,2)

Single Position

For row 4, number 6 is only possible in cell (5,4)

Single Position

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

Single Position

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

Single Position

For column 3, Number 4 is only possible in cell (3,8)

Single Position

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

Candidate Lines

For box 1, candidates for 5 are all in row 3, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

For column 1, Number 4 is only possible in cell (1,6)

Single Position

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

Candidate Lines

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

Candidate Lines

For box 9, candidates for 6 are all in row 7, so you can remove candidates from other blocks.

Candidate Lines

For box 1, candidates for 7 are all in row 3, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Candidates for 7 in boxes 4 and 5 force the candidates in box 6 to be in the remaining line.

Multiple Lines

Naked Pair for 2 and 7, can remove these as candidates from other cells.

Naked Pairs

For blocks 2 and 8, candidates for 7 are all in the same two columns (4 and 6)

Double Pairs

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

Multiple Lines

Naked Pair for 8 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

Naked Pair for 5 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (3,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (4,2).

Single Candidate

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

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate