Step-by-Step Solution

for Friday 6th March Fiendish

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

Single Position

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

Single Position

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

Single Position

For row 5, number 2 is only possible in cell (3,5)

Single Position

For row 8, number 2 is only possible in cell (6,8)

Single Position

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

Single Position

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

Candidate Lines

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

Candidate Lines

For row 6, number 8 is only possible in cell (1,6)

Single Position

For box 3, candidates for 3 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

For blocks 3 and 6, candidates for 9 are all in the same two columns (8 and 9)

Double Pairs

Naked Pair for 5 and 6, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Single Position

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

Candidate Lines

Candidates for 7 in boxes 5 and 6 force the candidates in box 4 to be in the remaining line.

Multiple Lines

For column 2, Number 7 is only possible in cell (2,8)

Single Position

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

Multiple Lines

Naked Pair for 4 and 8, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

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

Multiple Lines

Candidates for 5 in boxes 4 and 7 force the candidates in box 1 to be in the remaining line.

Multiple Lines

Naked Pair for 5 and 6, can remove these as candidates from other cells.

Naked Pairs

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

Single Position

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

Single Position

Candidates for 4 in boxes 2 and 8 force the candidates in box 5 to be in the remaining line.

Multiple Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (9,1).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (3,2).

Single Candidate

Number 1 is the only value possible in cell (9,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (1,4).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (7,9).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 1 is the only value possible in cell (2,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (9,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate