Step-by-Step Solution

for Tuesday 22nd April Diabolical

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For column 1, Number 9 is only possible in cell (1,4)

Single Position

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

Single Position

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

Single Position

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

Single Position

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

Single Position

For row 6, number 4 is only possible in cell (5,6)

Single Position

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

Single Position

For row 8, number 4 is only possible in cell (1,8)

Single Position

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

Single Position

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

Single Candidate

For box 6, Number 7 is only possible in cell (9,5)

Single Position

For blocks 5 and 8, candidates for 2 are all in the same two columns (4 and 5)

Double Pairs

Hidden Pair for 5 and 9, can remove other candidates from these cells.

Hidden Pairs

Either candidate for cell (8,7) forces 1 into cell (8,6).

Forcing Chains

Either candidate for cell (2,8) forces 9 into cell (7,1).

Forcing Chains

Either candidate for cell (2,8) forces 2 into cell (2,1).

Forcing Chains

For row 3, number 2 is only possible in cell (7,3)

Single Position

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

Single Candidate

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

Single Candidate

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

Single Position

For box 3, candidates for 1 are all in column 9, so you can remove candidates from other blocks.

Candidate Lines

Candidates for 7 in boxes 2 and 5 force the candidates in box 8 to be in the remaining line.

Multiple Lines

Naked Pair for 1 and 7, can remove these as candidates from other cells.

Naked Pairs

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

Single Position

Number 8 is the only value possible in cell (1,7).

Single Candidate

Number 3 is the only value possible in cell (8,7).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 5 is the only value possible in cell (4,8).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate