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Daily Sudoku Answer 



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Jan 19 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C9 can only be <3>

R2C8 is the only square in row 2 that can be <7>

R3C4 is the only square in row 3 that can be <9>

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

R8C2 is the only square in block 7 that can be <7>

Squares R6C2 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C1 - removing <4> from <47> leaving <7>

R6C3 - removing <9> from <2389> leaving <238>

R6C7 - removing <49> from <23489> leaving <238>

R6C9 - removing <4> from <478> leaving <78>

R6C9 can only be <8>

R4C9 is the only square in row 4 that can be <7>

R5C3 is the only square in row 5 that can be <8>

R5C7 is the only square in row 5 that can be <2>

R6C7 can only be <3>

R6C3 can only be <2>

R4C3 is the only square in row 4 that can be <3>

Squares R5C6 and R9C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C6 - removing <4> from <4568> leaving <568>

R2C6 - removing <4> from <24568> leaving <2568>

R8C6 - removing <4> from <456> leaving <56>

Intersection of column 7 with block 9. The value <9> only appears in one or more of squares R7C7, R8C7 and R9C7 of column 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R8C8 - removing <9> from <149> leaving <14>

Intersection of block 5 with row 5. The values <347> 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.

R5C1 - removing <4> from <1456> leaving <156>

R5C2 - removing <4> from <1459> leaving <159>

R5C8 - removing <4> from <1469> leaving <169>

R5C9 - removing <4> from <45> leaving <5>

R3C9 can only be <4>

R3C1 can only be <5>

R7C1 can only be <1>

R1C3 can only be <6>

R7C4 can only be <2>

R5C1 can only be <6>

R9C3 can only be <9>

R7C6 can only be <5>

R8C6 can only be <6>

R1C6 can only be <8>

R8C3 can only be <5>

R1C4 can only be <4>

R2C3 can only be <1>

R2C4 can only be <6>

R2C5 can only be <5>

R1C7 can only be <5>

R2C6 can only be <2>

R2C7 can only be <8>

R2C2 can only be <4>

R4C1 can only be <4>

R6C2 can only be <9>

R4C7 can only be <1>

R4C2 can only be <5>

R4C8 can only be <6>

R9C7 can only be <4>

R5C8 can only be <9>

R5C2 can only be <1>

R6C8 can only be <4>

R8C8 can only be <1>

R8C4 can only be <3>

R9C6 can only be <7>

R8C7 can only be <9>

R8C5 can only be <4>

R5C4 can only be <7>

R5C5 can only be <3>

R9C4 can only be <1>

R5C6 can only be <4>



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