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Daily Sudoku Answer 



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Dec 14 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C2 can only be <5>

R4C2 is the only square in row 4 that can be <8>

R5C2 can only be <7>

R1C3 is the only square in row 1 that can be <8>

R1C2 is the only square in row 1 that can be <9>

R5C6 is the only square in row 5 that can be <8>

R7C9 is the only square in row 7 that can be <8>

R7C7 is the only square in row 7 that can be <3>

R8C6 is the only square in row 8 that can be <5>

R9C5 is the only square in row 9 that can be <3>

R9C8 is the only square in row 9 that can be <7>

R5C1 is the only square in column 1 that can be <3>

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

R4C5 is the only square in column 5 that can be <7>

R7C4 is the only square in column 4 that can be <7>

R5C4 is the only square in column 4 that can be <9>

R6C8 is the only square in row 6 that can be <9>

Squares R7C3 and R7C6 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C1 - removing <2> from <246> leaving <46>

Squares R1C4 and R4C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C4 - removing <12> from <1245> leaving <45>

R3C4 - removing <1> from <145> leaving <45>

Squares R7C6 and R9C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C6 - removing <2> from <126> leaving <16>

Squares R3C6<16>, R3C7<19>, R3C8<136> and R3C9<1369> in row 3 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <1369>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C1 - removing <16> from <14567> leaving <457>

R3C3 - removing <1> from <17> leaving <7>

R8C1 is the only square in row 8 that can be <7>

R6C1 is the only square in column 1 that can be <2>

R6C5 can only be <6>

R5C3 can only be <1>

R6C6 can only be <1>

R1C5 can only be <2>

R3C6 can only be <6>

R4C4 can only be <2>

R1C4 can only be <1>

R1C1 can only be <6>

R7C1 can only be <4>

R2C2 can only be <4>

R2C4 can only be <5>

R7C2 can only be <6>

R3C1 can only be <5>

R2C1 can only be <1>

R3C4 can only be <4>

R2C7 can only be <2>

R2C9 can only be <6>

R5C7 can only be <4>

R5C9 can only be <2>

R9C7 can only be <9>

R5C8 can only be <6>

R9C6 can only be <2>

R9C9 can only be <4>

R3C7 can only be <1>

R8C9 can only be <1>

R3C8 can only be <3>

R3C9 can only be <9>

R4C8 can only be <1>

R4C9 can only be <3>

R8C8 can only be <2>

R8C3 can only be <9>

R7C6 can only be <9>

R7C3 can only be <2>



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