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Daily Sudoku Answer 



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Dec 11 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C8 can only be <2>

R2C8 can only be <6>

R3C9 can only be <1>

R3C7 can only be <3>

R2C9 can only be <4>

R1C5 is the only square in row 1 that can be <4>

R3C6 is the only square in row 3 that can be <2>

R3C5 is the only square in row 3 that can be <9>

R4C7 is the only square in row 4 that can be <7>

R7C4 is the only square in row 7 that can be <3>

R1C1 is the only square in row 1 that can be <3>

R2C6 is the only square in row 2 that can be <3>

R5C2 is the only square in row 5 that can be <3>

R7C5 is the only square in row 7 that can be <8>

R8C1 is the only square in row 8 that can be <4>

R8C4 is the only square in column 4 that can be <2>

R9C2 is the only square in column 2 that can be <2>

R2C5 is the only square in block 2 that can be <5>

Squares R8C2 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C5 - removing <1> from <167> leaving <67>

R8C8 - removing <5> from <59> leaving <9>

R8C9 - removing <5> from <5679> leaving <679>

R5C8 can only be <8>

R6C8 can only be <5>

R6C6 is the only square in row 6 that can be <8>

R4C6 can only be <4>

Squares R5C1 and R5C5 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C3 - removing <16> from <1469> leaving <49>

R5C7 - removing <6> from <246> leaving <24>

R5C9 - removing <6> from <269> leaving <29>

Squares R1C4 and R2C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C4 - removing <1> from <169> leaving <69>

R6C3 is the only square in row 6 that can be <1>

R1C3 can only be <7>

R5C1 can only be <6>

R1C4 can only be <1>

R7C3 can only be <5>

R2C4 can only be <7>

R5C5 can only be <1>

R3C1 can only be <5>

R3C3 can only be <6>

R4C3 can only be <9>

R8C2 can only be <1>

R8C6 can only be <5>

R2C2 can only be <8>

R7C1 can only be <7>

R9C6 can only be <1>

R9C7 can only be <6>

R9C5 can only be <7>

R6C7 can only be <4>

R8C9 can only be <7>

R2C1 can only be <1>

R4C2 can only be <5>

R4C1 can only be <8>

R4C4 can only be <6>

R5C3 can only be <4>

R6C4 can only be <9>

R5C7 can only be <2>

R5C9 can only be <9>

R7C7 can only be <1>

R6C9 can only be <6>

R7C9 can only be <2>

R8C5 can only be <6>

R9C9 can only be <5>



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