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Daily Sudoku Answer 



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Nov 10 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C9 is the only square in row 2 that can be <1>

R3C9 is the only square in row 3 that can be <9>

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

R2C4 is the only square in row 2 that can be <9>

R8C7 is the only square in row 8 that can be <9>

R8C1 is the only square in row 8 that can be <7>

R5C3 is the only square in row 5 that can be <7>

R9C5 is the only square in row 9 that can be <6>

R2C6 is the only square in row 2 that can be <6>

R9C7 is the only square in row 9 that can be <7>

R5C1 is the only square in column 1 that can be <6>

R6C8 is the only square in column 8 that can be <5>

R6C9 is the only square in row 6 that can be <6>

R1C8 is the only square in row 1 that can be <6>

R6C4 is the only square in row 6 that can be <8>

R5C9 is the only square in column 9 that can be <4>

R5C7 is the only square in row 5 that can be <3>

R1C7 can only be <8>

R4C7 can only be <1>

R4C8 can only be <8>

R2C3 is the only square in column 3 that can be <8>

R7C1 is the only square in column 1 that can be <8>

R4C6 is the only square in block 5 that can be <4>

Squares R2C2 and R4C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R7C2 - removing <3> from <135> leaving <15>

R9C2 - removing <3> from <1345> leaving <145>

Intersection of row 8 with block 8. The values <48> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R9C4 - removing <4> from <2345> leaving <235>

R8C4 is the only square in column 4 that can be <4>

Intersection of column 4 with block 8. The value <3> only appears in one or more of squares R7C4, R8C4 and R9C4 of column 4. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R7C5 - removing <3> from <1235> leaving <125>

R8C5 - removing <3> from <138> leaving <18>

R8C8 is the only square in row 8 that can be <3>

R3C8 can only be <2>

R7C9 can only be <2>

R3C6 can only be <8>

R9C8 can only be <1>

R1C9 can only be <3>

R1C3 can only be <4>

R8C6 can only be <1>

R8C5 can only be <8>

R7C5 can only be <5>

R6C3 can only be <1>

R9C3 can only be <3>

R3C1 can only be <3>

R3C5 can only be <4>

R4C1 can only be <2>

R9C1 can only be <4>

R2C2 can only be <2>

R4C2 can only be <3>

R6C2 can only be <4>

R7C2 can only be <1>

R7C4 can only be <3>

R1C5 can only be <2>

R9C2 can only be <5>

R9C4 can only be <2>

R5C4 can only be <5>

R1C6 can only be <5>

R2C5 can only be <3>

R5C5 can only be <1>

R5C6 can only be <2>



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