Step-by-Step Solution

for Sunday 28th September Fiendish

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

Single Candidate

Number 7 is the only value possible in cell (1,9).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

For row 1, number 2 is only possible in cell (6,1)

Single Position

For row 7, number 3 is only possible in cell (2,7)

Single Position

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

Candidate Lines

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

Single Position

Candidates for 8 in boxes 1 and 2 force the candidates in box 3 to be in the remaining line.

Multiple Lines

For column 9, Number 8 is only possible in cell (9,1)

Single Position

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

Naked Pairs

Hidden Pair for 3 and 5, can remove other candidates from these cells.

Hidden Pairs

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

Single Position

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

Single Candidate

Number 3 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 is the only value possible in cell (8,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (3,6).

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (2,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (8,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (4,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (3,9).

Single Candidate

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

Single Candidate