Step-by-Step Solution

for Saturday 2nd May Diabolical

For row 3, number 1 is only possible in cell (7,3)

Single Position

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

Single Position

Number 4 is the only value possible in cell (2,8).

Single Candidate

Number 7 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 5 is the only value possible in cell (4,8).

Single Candidate

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

Single Candidate

For row 5, number 9 is only possible in cell (4,5)

Single Position

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

Single Position

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

Single Position

For column 8, Number 7 is only possible in cell (8,1)

Single Position

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

Single Position

For row 1, number 5 is only possible in cell (6,1)

Single Position

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

Single Candidate

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

Single Candidate

For row 3, number 5 is only possible in cell (8,3)

Single Position

For row 7, number 5 is only possible in cell (3,7)

Single Position

For row 9, number 4 is only possible in cell (8,9)

Single Position

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

Single Position

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

Single Candidate

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

Single Position

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

Single Position

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

Single Position

For box 1, candidates for 2 are all in column 3, so you can remove candidates from other blocks.

Candidate Lines

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

Single Candidate

Naked Pair for 7 and 8, can remove these as candidates from other cells.

Naked Pairs

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

Candidate Lines

Candidates for 8 in boxes 1 and 4 force the candidates in box 7 to be in the remaining line.

Multiple Lines

Naked Pair for 2 and 3, can remove these as candidates from other cells.

Naked Pairs

Swordfish in rows for 6.

Swordfish

Either candidate for cell (8,2) forces 8 into cell (6,2).

Forcing Chains

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 6 is the only value possible in cell (1,7).

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (3,1).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 7 is the only value possible in cell (1,6).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (9,7).

Single Candidate

Number 8 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 1 is the only value possible in cell (4,9).

Single Candidate

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

Single Candidate

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

Single Candidate