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Daily Sudoku Answer 



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Jan 19 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C2 can only be <7>

R6C8 can only be <3>

R4C2 can only be <5>

R6C4 can only be <9>

R6C6 can only be <4>

R5C7 can only be <2>

R5C3 can only be <6>

R5C1 can only be <4>

R6C5 can only be <6>

R1C9 is the only square in row 1 that can be <6>

R1C7 is the only square in row 1 that can be <9>

R2C6 is the only square in row 2 that can be <2>

R4C6 can only be <8>

R1C3 is the only square in row 1 that can be <2>

R1C1 is the only square in row 1 that can be <8>

R3C9 is the only square in row 3 that can be <8>

R2C4 is the only square in row 2 that can be <8>

R4C5 is the only square in row 4 that can be <2>

R7C9 is the only square in row 7 that can be <9>

R8C9 is the only square in row 8 that can be <2>

R9C1 is the only square in row 9 that can be <6>

R9C3 is the only square in row 9 that can be <8>

Squares R3C5 and R3C7 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C1 - removing <3> from <357> leaving <57>

Squares R1C5 and R3C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C5 - removing <3> from <1357> leaving <157>

R7C5 - removing <3> from <1357> leaving <157>

R9C5 - removing <3> from <1357> leaving <157>

Intersection of column 4 with block 5. The value <1> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R5C5 - removing <1> from <157> leaving <57>

Intersection of block 8 with row 8. The value <3> only appears in one or more of squares R8C4, R8C5 and R8C6 of block 8. These squares are the ones that intersect with row 8. Thus, the other (non-intersecting) squares of row 8 cannot contain this value.

R8C1 - removing <3> from <357> leaving <57>

Squares R3C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R7C1 - removing <57> from <1357> leaving <13>

Intersection of block 9 with row 9. The values <47> only appears in one or more of squares R9C7, R9C8 and R9C9 of block 9. These squares are the ones that intersect with row 9. Thus, the other (non-intersecting) squares of row 9 cannot contain these values.

R9C5 - removing <7> from <157> leaving <15>

Squares R2C9 and R9C2 form a remote naked pair. <13> can be removed from any square that is common to their groups.

R9C9 - removing <3> from <37> leaving <7>

R9C8 can only be <4>

R5C9 can only be <1>

R2C9 can only be <3>

R4C8 can only be <7>

R1C8 can only be <1>

R1C2 can only be <3>

R2C1 can only be <1>

R3C7 can only be <4>

R3C5 can only be <3>

R4C4 can only be <1>

R1C5 can only be <4>

R9C2 can only be <1>

R7C1 can only be <3>

R7C7 can only be <5>

R7C3 can only be <7>

R9C7 can only be <3>

R9C5 can only be <5>

R5C5 can only be <7>

R8C6 can only be <3>

R5C4 can only be <3>

R7C5 can only be <1>

R3C3 can only be <5>

R8C1 can only be <5>

R3C1 can only be <7>

R8C4 can only be <7>

R5C6 can only be <5>



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