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Daily Sudoku Answer 



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Dec 12 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C9 can only be <1>

R9C1 can only be <1>

R2C9 can only be <6>

R8C1 can only be <8>

R1C8 is the only square in row 1 that can be <8>

R3C4 is the only square in row 3 that can be <8>

R5C5 is the only square in row 5 that can be <7>

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

Squares R1C1 and R2C1 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C2 - removing <34> from <349> leaving <9>

R1C5 can only be <4>

R1C1 can only be <3>

R2C1 can only be <4>

R5C3 is the only square in row 5 that can be <9>

R5C7 is the only square in row 5 that can be <8>

R4C3 is the only square in row 4 that can be <8>

Squares R4C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R8C7 - removing <2> from <279> leaving <79>

Squares R4C7 and R6C7 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R5C9 - removing <2> from <235> leaving <35>

R5C2 is the only square in row 5 that can be <2>

R6C3 can only be <1>

R2C3 can only be <7>

R4C2 can only be <4>

R2C7 can only be <9>

R8C3 can only be <2>

R3C2 can only be <1>

R8C7 can only be <7>

R3C8 can only be <7>

R4C7 can only be <2>

R6C2 can only be <3>

R6C7 can only be <4>

R6C8 can only be <6>

R6C4 can only be <9>

R6C6 can only be <2>

R4C8 is the only square in row 4 that can be <1>

R7C5 is the only square in row 7 that can be <2>

R9C9 is the only square in row 9 that can be <2>

R9C2 is the only square in row 9 that can be <7>

R7C2 can only be <5>

R7C8 can only be <3>

R7C6 can only be <6>

R5C8 can only be <5>

R8C9 can only be <5>

R8C4 can only be <3>

R5C9 can only be <3>

R9C8 can only be <9>

R9C5 can only be <5>

R7C4 can only be <7>

R3C6 can only be <9>

R4C6 can only be <5>

R2C4 can only be <5>

R2C5 can only be <1>

R4C4 can only be <6>

R2C6 can only be <3>

R8C5 can only be <9>

R3C5 can only be <6>

R8C6 can only be <1>



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