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Daily Sudoku Answer 



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Nov 19 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C2 is the only square in row 1 that can be <9>

R2C9 is the only square in row 2 that can be <7>

R3C7 is the only square in row 3 that can be <1>

R4C5 is the only square in row 4 that can be <9>

R4C6 is the only square in row 4 that can be <6>

R5C9 is the only square in row 5 that can be <9>

R5C7 is the only square in row 5 that can be <6>

R7C8 is the only square in row 7 that can be <9>

R8C1 is the only square in row 8 that can be <2>

R9C1 is the only square in column 1 that can be <1>

R9C2 is the only square in block 7 that can be <6>

R2C1 is the only square in row 2 that can be <6>

Intersection of row 2 with block 1. The value <4> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. 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 <4> from <3458> leaving <358>

Intersection of row 4 with block 4. The value <7> only appears in one or more of squares R4C1, R4C2 and R4C3 of row 4. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R5C3 - removing <7> from <2478> leaving <248>

Intersection of row 5 with block 5. The values <17> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. 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 <7> from <23478> leaving <2348>

R6C6 - removing <7> from <3578> leaving <358>

Intersection of row 6 with block 5. The values <345> only appears in one or more of squares R6C4, R6C5 and R6C6 of row 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.

R4C4 - removing <3> from <238> leaving <28>

R5C4 - removing <4> from <1248> leaving <128>

R5C5 - removing <4> from <2478> leaving <278>

Intersection of block 6 with row 6. The values <278> only appears in one or more of squares R6C7, R6C8 and R6C9 of block 6. These squares are the ones that intersect with row 6. Thus, the other (non-intersecting) squares of row 6 cannot contain these values.

R6C4 - removing <28> from <23458> leaving <345>

R6C5 - removing <28> from <2348> leaving <34>

R6C6 - removing <8> from <358> leaving <35>

Squares R2C6 and R6C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C6 - removing <35> from <358> leaving <8>

R8C6 - removing <3> from <137> leaving <17>

R3C3 is the only square in row 3 that can be <8>

R3C8 is the only square in row 3 that can be <5>

R1C7 can only be <3>

R1C1 can only be <5>

R8C7 can only be <7>

R8C6 can only be <1>

R6C7 can only be <8>

R9C8 can only be <4>

R8C8 can only be <6>

R6C9 can only be <2>

R7C7 can only be <5>

R6C8 can only be <7>

R3C9 can only be <6>

R5C6 can only be <7>

R8C9 can only be <3>

R1C8 can only be <2>

R8C4 can only be <4>

R9C9 can only be <8>

R9C4 can only be <3>

R1C5 can only be <6>

R1C9 can only be <4>

R9C5 can only be <7>

R6C4 can only be <5>

R9C3 can only be <5>

R7C5 can only be <8>

R6C6 can only be <3>

R2C4 can only be <2>

R6C5 can only be <4>

R2C6 can only be <5>

R5C5 can only be <2>

R4C4 can only be <8>

R3C5 can only be <3>

R3C2 can only be <2>

R4C1 can only be <3>

R5C4 can only be <1>

R5C3 can only be <4>

R4C2 can only be <7>

R7C1 can only be <4>

R4C3 can only be <2>

R5C1 can only be <8>

R2C3 can only be <3>

R7C2 can only be <3>

R7C3 can only be <7>

R2C2 can only be <4>



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