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Daily Sudoku Answer 



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Jan 11 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C3 can only be <6>

R5C3 can only be <4>

R7C3 can only be <5>

R2C3 can only be <7>

R3C3 can only be <2>

R4C1 is the only square in row 4 that can be <7>

R4C4 is the only square in row 4 that can be <3>

R4C5 is the only square in row 4 that can be <4>

R3C5 can only be <8>

R4C8 is the only square in row 4 that can be <2>

R6C4 is the only square in row 6 that can be <2>

R1C5 is the only square in row 1 that can be <2>

R6C7 is the only square in row 6 that can be <5>

R7C9 is the only square in row 7 that can be <3>

R8C1 is the only square in row 8 that can be <2>

R8C6 is the only square in row 8 that can be <3>

R6C9 is the only square in column 9 that can be <8>

R5C1 is the only square in row 5 that can be <8>

R6C6 is the only square in row 6 that can be <1>

R5C6 can only be <9>

R5C4 can only be <6>

R5C8 can only be <1>

Squares R1C1 and R1C2 in row 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 row.

R1C4 - removing <4> from <147> leaving <17>

R1C8 - removing <3> from <38> leaving <8>

R9C4 is the only square in row 9 that can be <8>

R7C7 is the only square in row 7 that can be <8>

R3C8 is the only square in column 8 that can be <3>

Squares R1C1 and R1C2 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.

R2C1 - removing <4> from <456> leaving <56>

R3C1 - removing <4> from <456> leaving <56>

Squares R2C1 and R3C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R7C1 - removing <6> from <146> leaving <14>

R9C1 - removing <6> from <169> leaving <19>

R7C2 is the only square in row 7 that can be <6>

Squares R8C5 and R9C5 in block 8 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 block.

R7C4 - removing <1> from <14> leaving <4>

R8C4 - removing <1> from <1457> leaving <457>

R7C1 can only be <1>

R9C1 can only be <9>

R9C2 can only be <7>

R6C1 can only be <3>

R9C6 can only be <5>

R8C2 can only be <4>

R9C8 can only be <6>

R2C6 can only be <4>

R8C4 can only be <7>

R9C5 can only be <1>

R2C8 can only be <9>

R3C6 can only be <7>

R8C8 can only be <5>

R3C7 can only be <6>

R1C4 can only be <1>

R3C1 can only be <5>

R3C9 can only be <4>

R4C7 can only be <9>

R2C9 can only be <1>

R4C9 can only be <6>

R8C7 can only be <1>

R6C2 can only be <9>

R1C1 can only be <4>

R1C2 can only be <3>

R8C5 can only be <6>

R8C9 can only be <9>

R1C7 can only be <7>

R2C4 can only be <5>

R2C1 can only be <6>

R3C4 can only be <9>



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