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Daily Sudoku Answer 



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Feb 01 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C7 can only be <7>

R7C7 can only be <6>

R2C7 can only be <2>

R9C7 can only be <8>

R9C9 can only be <1>

R8C8 can only be <9>

R3C7 can only be <5>

R3C9 can only be <7>

R5C7 can only be <4>

R1C8 can only be <1>

R8C6 can only be <1>

R1C6 is the only square in row 1 that can be <7>

R7C3 is the only square in row 7 that can be <7>

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

R9C4 is the only square in row 9 that can be <7>

R2C2 is the only square in column 2 that can be <9>

R2C4 can only be <1>

R2C5 can only be <6>

R2C9 can only be <3>

R2C3 can only be <4>

R1C9 can only be <6>

R4C5 is the only square in row 4 that can be <1>

R5C3 is the only square in row 5 that can be <1>

R6C6 is the only square in row 6 that can be <6>

Intersection of column 3 with block 1. The value <8> only appears in one or more of squares R1C3, R2C3 and R3C3 of column 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C1 - removing <8> from <238> leaving <23>

Intersection of column 4 with block 5. The values <35> 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 these values.

R6C5 - removing <3> from <2348> leaving <248>

Intersection of column 6 with block 5. The value <8> only appears in one or more of squares R4C6, R5C6 and R6C6 of column 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R6C5 - removing <8> from <248> leaving <24>

R6C1 is the only square in row 6 that can be <8>

R5C1 can only be <3>

R1C1 can only be <2>

R1C5 can only be <8>

R8C1 can only be <5>

R3C3 can only be <8>

R1C3 can only be <3>

R8C5 can only be <3>

R7C1 can only be <4>

R8C3 can only be <2>

R9C5 can only be <4>

R9C2 can only be <3>

R6C5 can only be <2>

R7C6 can only be <9>

R6C4 can only be <3>

R6C8 can only be <7>

R3C5 can only be <9>

R4C4 can only be <5>

R6C2 can only be <4>

R4C8 can only be <2>

R7C5 can only be <5>

R5C6 can only be <8>

R3C4 can only be <2>

R4C9 can only be <8>

R5C4 can only be <9>

R4C6 can only be <4>

R5C9 can only be <5>

R4C2 can only be <7>



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