Step-by-Step Solution

for Tuesday 14th January Fiendish

For row 5, number 1 is only possible in cell (6,5)

Single Position

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

Single Position

For column 1, Number 4 is only possible in cell (1,5)

Single Position

For column 3, Number 2 is only possible in cell (3,9)

Single Position

For box 6, candidates for 7 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

For blocks 2 and 5, candidates for 4 are all in the same two columns (4 and 5)

Double Pairs

Naked Triple for 5, 7 and 9, can remove these as candidates from other cells.

Naked Triples

For box 8, candidates for 9 are all in column 5, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (1,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 4, number 6 is only possible in cell (2,4)

Single Position

For row 3, number 6 is only possible in cell (1,3)

Single Position

For row 1, number 6 is only possible in cell (7,1)

Single Position

For row 7, number 4 is only possible in cell (8,7)

Single Position

For row 4, number 8 is only possible in cell (9,4)

Single Position

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

Single Position

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

Single Position

For row 4, number 9 is only possible in cell (7,4)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (4,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (4,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate