Step-by-Step Solution

for Tuesday 3rd February Fiendish

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (3,1).

Single Candidate

For row 2, number 8 is only possible in cell (4,2)

Single Position

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

Single Position

For row 9, number 8 is only possible in cell (1,9)

Single Position

For column 4, Number 7 is only possible in cell (4,5)

Single Position

For row 9, number 2 is only possible in cell (4,9)

Single Position

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

Single Position

For column 3, Number 2 is only possible in cell (3,4)

Single Position

For column 6, Number 2 is only possible in cell (6,5)

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 6, number 2 is only possible in cell (7,6)

Single Position

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

Single Position

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

Single Position

For box 4, candidates for 3 are all in column 2, so you can remove candidates from other blocks.

Candidate Lines

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

Candidate Lines

Candidates for 3 in boxes 4 and 5 force the candidates in box 6 to be in the remaining line.

Multiple Lines

Hidden Pair for 6 and 9, can remove other candidates from these cells.

Hidden Pairs

Hidden Pair for 4 and 7, can remove other candidates from these cells.

Hidden Pairs

For row 7, number 1 is only possible in cell (4,7)

Single Position

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

Single Candidate

Number 6 is the only value possible in cell (9,4).

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (5,4).

Single Candidate

Number 5 is the only value possible in cell (2,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 7, number 9 is only possible in cell (2,7)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (6,2).

Single Candidate

Number 1 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 1 is the only value possible in cell (2,3).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (5,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate