Step-by-Step Solution

for Tuesday 28th July Fiendish

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

Single Position

For row 1, number 2 is only possible in cell (4,1)

Single Position

For column 8, Number 4 is only possible in cell (8,2)

Single Position

For row 3, number 4 is only possible in cell (2,3)

Single Position

For row 6, number 9 is only possible in cell (3,6)

Single Position

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

Candidate Lines

For box 4, candidates for 2 are all in column 1, so you can remove candidates from other blocks.

Candidate Lines

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

Single Position

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

Single Position

Naked Pair for 3 and 6, can remove these as candidates from other cells.

Naked Pairs

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

Single Position

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

Multiple Lines

Hidden Pair for 2 and 3, can remove other candidates from these cells.

Hidden Pairs

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

Single Position

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

Single Position

For row 1, number 5 is only possible in cell (3,1)

Single Position

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

Single Candidate

For row 5, number 8 is only possible in cell (4,5)

Single Position

For column 5, Number 8 is only possible in cell (5,9)

Single Position

For row 2, number 5 is only possible in cell (6,2)

Single Position

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

Single Position

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

Single Position

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

Single Position

For box 8, Number 9 is only possible in cell (5,7)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (1,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (8,5).

Single Candidate

Number 4 is the only value possible in cell (5,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 9 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 1 is the only value possible in cell (6,9).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate