Step-by-Step Solution

for Friday 15th May Fiendish

Number 3 is the only value possible in cell (7,1).

Single Candidate

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (7,3).

Single Candidate

Number 6 is the only value possible in cell (7,5).

Single Candidate

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

Single Candidate

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

Single Candidate

For column 9, Number 4 is only possible in cell (9,3)

Single Position

For column 8, Number 1 is only possible in cell (8,5)

Single Position

For column 8, Number 3 is only possible in cell (8,4)

Single Position

For box 4, candidates for 5 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

For box 4, candidates for 8 are all in row 5, so you can remove candidates from other blocks.

Candidate Lines

For box 8, candidates for 4 are all in column 6, so you can remove candidates from other blocks.

Candidate Lines

For box 2, candidates for 3 are all in column 5, so you can remove candidates from other blocks.

Candidate Lines

For box 2, candidates for 7 are all in column 5, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

Naked Pair for 1 and 6, can remove these as candidates from other cells.

Naked Pairs

Candidates for 1 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line.

Multiple Lines

Candidates for 6 in boxes 5 and 8 force the candidates in box 2 to be in the remaining line.

Multiple Lines

Hidden Pair for 1 and 6, can remove other candidates from these cells.

Hidden Pairs

For column 6, Number 3 is only possible in cell (6,5)

Single Position

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

Single Position

For row 5, number 7 is only possible in cell (9,5)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (2,6).

Single Candidate

Number 2 is the only value possible in cell (3,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (5,2).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (5,3).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (1,7).

Single Candidate

Number 1 is the only value possible in cell (3,7).

Single Candidate

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

Single Candidate

Number 9 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 2 is the only value possible in cell (6,9).

Single Candidate