Step-by-Step Solution

for Friday 4th April Diabolical

For row 3, number 9 is only possible in cell (7,3)

Single Position

For column 2, Number 9 is only possible in cell (2,4)

Single Position

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

Single Position

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

Single Position

For row 3, number 8 is only possible in cell (9,3)

Single Position

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

Single Position

For row 4, number 8 is only possible in cell (3,4)

Single Position

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

Single Position

For row 9, number 7 is only possible in cell (2,9)

Single Position

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

Single Position

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

Single Position

For row 4, number 7 is only possible in cell (5,4)

Single Position

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

Single Position

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

Single Position

For row 3, number 2 is only possible in cell (1,3)

Single Position

For row 7, number 2 is only possible in cell (9,7)

Single Position

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

Single Position

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

Single Position

For column 3, Number 6 is only possible in cell (3,2)

Single Position

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

Single Position

For column 3, Number 3 is only possible in cell (3,7)

Single Position

For box 9, candidates for 6 are all in column 8, so you can remove candidates from other blocks.

Candidate Lines

For box 1, candidates for 5 are all in row 1, so you can remove candidates from other blocks.

Candidate Lines

For box 7, candidates for 5 are all in row 8, so you can remove candidates from other blocks.

Candidate Lines

For box 4, candidates for 1 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

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

Multiple Lines

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

Single Position

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

For row 6, number 9 is only possible in cell (4,6)

Single Position

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

Single Position

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

Single Position

X-Wing in columns for 4.

X-Wings

Swordfish in rows for 3.

Swordfish

Either candidate for cell (4,2) forces 3 into cell (5,5).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate