Step-by-Step Solution

for Friday 17th January Tricky

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

Single Position

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

Single Candidate

For row 1, number 2 is only possible in cell (5,1)

Single Position

For row 4, number 1 is only possible in cell (3,4)

Single Position

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

Single Position

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

Single Candidate

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

Single Position

For blocks 3 and 6, candidates for 3 are all in the same two columns (7 and 8)

Double Pairs

Candidates for 1 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.

Multiple Lines

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

Naked Pairs

Naked Pair for 1 and 8, can remove these as candidates from other cells.

Naked Pairs

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

Single Candidate

For row 7, number 4 is only possible in cell (3,7)

Single Position

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

Single Position

For row 3, number 6 is only possible in cell (4,3)

Single Position

For column 6, Number 1 is only possible in cell (6,2)

Single Position

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

Single Candidate

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

Single Position

For row 3, number 8 is only possible in cell (2,3)

Single Position

For column 2, Number 1 is only possible in cell (2,1)

Single Position

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

Single Candidate

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

Single Position

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (9,8).

Single Candidate

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

Single Candidate

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

Single Candidate

Number 4 is the only value possible in cell (1,3).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

Number 2 is the only value possible in cell (4,5).

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate

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

Single Candidate