Step-by-Step Solution

for Monday 31st March Fiendish

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

Single Position

For row 8, number 9 is only possible in cell (6,8)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

For column 5, Number 2 is only possible in cell (5,3)

Single Position

For row 3, number 9 is only possible in cell (4,3)

Single Position

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

Candidate Lines

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

Candidate Lines

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Position

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

Single Position

For box 9, Number 5 is only possible in cell (8,9)

Single Position

For box 7, candidates for 3 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

For blocks 1 and 7, candidates for 7 are all in the same two columns (2 and 3)

Double Pairs

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

Multiple Lines

Naked Pair for 1 and 2, can remove these as candidates from other cells.

Naked Pairs

Naked Pair for 1 and 2, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

Naked Triple for 5, 6 and 9, can remove these as candidates from other cells.

Naked Triples

For column 1, Number 6 is only possible in cell (1,1)

Single Position

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

Single Candidate

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

Single Position

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

Single Position

For row 2, number 4 is only possible in cell (7,2)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (8,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 3 is the only value possible in cell (4,9).

Single Candidate

Number 1 is the only value possible in cell (6,9).

Single Candidate

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

Single Candidate