Step-by-Step Solution

for Tuesday 13th May Fiendish

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

Single Position

For column 7, Number 2 is only possible in cell (7,2)

Single Position

For column 7, Number 9 is only possible in cell (7,6)

Single Position

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

Single Position

For row 5, number 3 is only possible in cell (4,5)

Single Position

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

Single Position

For row 3, number 8 is only possible in cell (1,3)

Single Position

Candidates for 9 in boxes 1 and 2 force the candidates in box 3 to be in the remaining line.

Multiple Lines

Candidates for 5 in boxes 1 and 2 force the candidates in box 3 to be in the remaining line.

Multiple Lines

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

Naked Pairs

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

Single Position

For row 2, number 9 is only possible in cell (6,2)

Single Position

For row 1, number 8 is only possible in cell (5,1)

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 5, number 6 is only possible in cell (3,5)

Single Position

For box 4, candidates for 8 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

For box 2, candidates for 7 are all in row 2, 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 8 and 9, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Candidate

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

Single Position

For row 2, number 1 is only possible in cell (8,2)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

Number 5 is the only value possible in cell (6,9).

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (1,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

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 (4,7).

Single Candidate

Number 4 is the only value possible in cell (9,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (3,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 8 is the only value possible in cell (7,9).

Single Candidate

Number 6 is the only value possible in cell (8,9).

Single Candidate

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

Single Candidate