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Daily Sudoku Answer 



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Jan 09 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C1 is the only square in row 5 that can be <5>

R4C7 is the only square in row 4 that can be <5>

R9C4 is the only square in row 9 that can be <5>

R7C1 is the only square in column 1 that can be <1>

R3C4 is the only square in column 4 that can be <1>

R3C6 is the only square in row 3 that can be <4>

R3C3 is the only square in row 3 that can be <2>

R3C7 is the only square in row 3 that can be <9>

R1C6 is the only square in row 1 that can be <9>

R9C6 is the only square in column 6 that can be <1>

R7C9 is the only square in column 9 that can be <3>

R8C8 can only be <7>

R2C8 can only be <3>

R9C7 can only be <2>

R7C7 can only be <6>

R7C6 can only be <2>

R2C5 is the only square in row 2 that can be <2>

R8C6 is the only square in column 6 that can be <3>

R1C4 is the only square in column 4 that can be <3>

R1C3 is the only square in block 1 that can be <6>

Squares R1C5 and R9C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C5 - removing <8> from <13468> leaving <1346>

R5C5 - removing <8> from <468> leaving <46>

R6C5 - removing <8> from <13468> leaving <1346>

R8C5 - removing <8> from <468> leaving <46>

Squares R5C5 and R8C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C5 - removing <46> from <1346> leaving <13>

R6C5 - removing <46> from <1346> leaving <13>

Intersection of block 5 with row 5. The values <468> only appears in one or more of squares R5C4, R5C5 and R5C6 of block 5. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain these values.

R5C2 - removing <48> from <24789> leaving <279>

R5C9 - removing <468> from <4678> leaving <7>

R3C9 can only be <8>

R6C7 can only be <8>

R1C7 can only be <7>

R1C5 can only be <8>

R3C1 can only be <7>

R9C5 can only be <7>

R2C6 can only be <6>

R2C4 can only be <7>

R5C6 can only be <8>

R6C1 can only be <6>

R2C2 can only be <8>

R6C9 can only be <4>

R4C1 can only be <8>

R4C9 can only be <6>

R9C3 can only be <8>

R7C4 can only be <4>

R8C2 can only be <4>

R7C3 can only be <7>

R5C4 can only be <6>

R8C5 can only be <6>

R4C2 can only be <2>

R8C4 can only be <8>

R5C5 can only be <4>

R4C8 can only be <1>

R5C2 can only be <9>

R4C5 can only be <3>

R6C8 can only be <9>

R5C8 can only be <2>

R6C2 can only be <7>

R6C3 can only be <3>

R6C5 can only be <1>

R4C3 can only be <4>



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