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Daily Sudoku Answer 



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Dec 08 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C4 can only be <2>

R1C4 can only be <8>

R4C4 can only be <4>

R4C1 is the only square in row 4 that can be <3>

R4C3 is the only square in row 4 that can be <1>

R3C3 is the only square in column 3 that can be <9>

R3C5 can only be <2>

R2C5 can only be <9>

R9C8 is the only square in column 8 that can be <7>

R2C2 is the only square in block 1 that can be <8>

Squares R1C1 and R1C2 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C8 - removing <2> from <269> leaving <69>

Squares R9C2 and R9C6 in row 9 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 row.

R9C3 - removing <2> from <248> leaving <48>

Squares R1C1 and R1C2 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C1 - removing <2> from <125> leaving <15>

Squares R2C1 and R3C1 in column 1 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 column.

R6C1 - removing <5> from <2457> leaving <247>

R8C1 - removing <15> from <145> leaving <4>

R8C5 can only be <8>

R9C3 can only be <8>

R8C3 can only be <5>

R7C5 can only be <4>

R9C9 can only be <4>

R5C3 can only be <7>

R7C3 can only be <2>

R6C1 can only be <2>

R6C2 can only be <5>

R6C3 can only be <4>

R1C1 can only be <7>

R6C6 can only be <9>

R6C9 can only be <8>

R5C6 can only be <5>

R6C7 can only be <7>

R7C9 can only be <5>

R7C6 can only be <1>

R9C2 can only be <3>

R7C2 can only be <7>

R8C6 can only be <3>

R7C7 can only be <8>

R2C9 can only be <2>

R8C2 can only be <1>

R9C6 can only be <2>

R1C2 can only be <2>

R2C8 can only be <5>

R4C9 can only be <6>

R4C7 can only be <5>

R8C9 can only be <9>

R5C7 can only be <9>

R1C7 can only be <6>

R8C8 can only be <6>

R1C8 can only be <9>

R2C1 can only be <1>

R3C8 can only be <8>

R4C8 can only be <2>

R3C7 can only be <3>

R3C4 can only be <1>

R2C7 can only be <4>

R2C4 can only be <3>

R3C1 can only be <5>



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