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Daily Sudoku Answer 



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Dec 18 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R9C3 is the only square in column 3 that can be <1>

R8C5 is the only square in column 5 that can be <3>

Squares R9C1 and R9C2 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C5 - removing <9> from <689> leaving <68>

Squares R5C6 and R6C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C6 - removing <89> from <24689> leaving <246>

R7C6 - removing <89> from <4789> leaving <47>

R8C6 - removing <9> from <4679> leaving <467>

Squares R5C6 and R6C6 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C4 - removing <8> from <358> leaving <35>

R5C4 - removing <89> from <3589> leaving <35>

Squares R4C4 and R5C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C4 - removing <5> from <145> leaving <14>

Squares R9C1 and R9C2 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C1 - removing <79> from <479> leaving <4>

R8C2 - removing <79> from <24579> leaving <245>

R8C3 - removing <7> from <257> leaving <25>

R7C6 can only be <7>

R8C7 is the only square in row 8 that can be <7>

R6C7 can only be <4>

R5C2 is the only square in row 5 that can be <4>

R8C4 is the only square in row 8 that can be <9>

R7C9 is the only square in row 7 that can be <9>

R1C9 can only be <6>

R1C8 can only be <1>

R1C7 can only be <9>

R2C7 can only be <2>

R4C7 can only be <6>

R3C9 can only be <3>

R2C8 can only be <4>

R5C7 can only be <1>

R2C4 can only be <8>

R2C6 can only be <6>

R7C4 can only be <1>

R1C5 can only be <5>

R2C2 can only be <7>

R2C5 can only be <9>

R8C6 can only be <4>

R7C5 can only be <8>

R3C4 can only be <4>

R7C8 can only be <2>

R9C5 can only be <6>

R8C8 can only be <6>

R3C6 can only be <2>

R9C8 can only be <8>

R1C2 can only be <8>

R3C5 can only be <1>

R2C3 can only be <3>

R9C2 can only be <9>

R9C1 can only be <7>

R5C1 is the only square in row 5 that can be <6>

R3C1 can only be <5>

R3C2 can only be <6>

R4C1 can only be <3>

R4C4 can only be <5>

R6C1 can only be <9>

R4C2 can only be <2>

R5C4 can only be <3>

R5C8 can only be <5>

R6C8 can only be <3>

R6C6 can only be <8>

R6C9 can only be <7>

R5C6 can only be <9>

R6C3 can only be <5>

R4C9 can only be <8>

R8C2 can only be <5>

R5C3 can only be <8>

R4C3 can only be <7>

R5C9 can only be <2>

R8C3 can only be <2>



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