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Daily Sudoku Answer 



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Nov 16 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R3C1 can only be <6>

R5C4 can only be <1>

R7C1 can only be <5>

R3C9 can only be <2>

R3C5 can only be <1>

R2C8 can only be <6>

R5C6 can only be <9>

R5C5 can only be <3>

R7C5 can only be <4>

R7C9 can only be <1>

R2C3 is the only square in row 2 that can be <1>

R2C7 is the only square in row 2 that can be <9>

R4C7 is the only square in row 4 that can be <1>

R4C1 is the only square in row 4 that can be <9>

R8C6 is the only square in row 8 that can be <1>

R8C5 is the only square in row 8 that can be <9>

R8C1 is the only square in column 1 that can be <7>

R8C3 is the only square in row 8 that can be <8>

Squares R1C3 and R4C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C3 - removing <45> from <2456> leaving <26>

Squares R4C9 and R8C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C9 - removing <45> from <45678> leaving <678>

Intersection of row 8 with block 9. The values <24> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.

R9C7 - removing <2> from <23> leaving <3>

R9C3 can only be <6>

R5C3 can only be <2>

R8C2 can only be <3>

R5C8 can only be <5>

R6C3 can only be <3>

R5C2 can only be <6>

R8C8 can only be <2>

R4C9 can only be <4>

R6C1 can only be <8>

R2C2 can only be <5>

R8C7 can only be <4>

R2C5 can only be <2>

R1C3 can only be <4>

R9C5 can only be <5>

R4C3 can only be <5>

R8C9 can only be <5>

R6C7 can only be <2>

R6C9 can only be <6>

R5C1 can only be <4>

R8C4 can only be <6>

R9C4 can only be <7>

R1C5 can only be <6>

R1C6 can only be <7>

R2C1 can only be <3>

R1C7 can only be <8>

R2C6 can only be <4>

R9C6 can only be <2>

R2C4 can only be <8>

R1C4 can only be <5>

R5C7 can only be <7>

R2C9 can only be <7>

R5C9 can only be <8>



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