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Daily Sudoku Answer 



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Oct 18 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C6 can only be <2>

R6C3 can only be <6>

R2C8 is the only square in row 2 that can be <4>

R3C2 is the only square in row 3 that can be <8>

R4C8 is the only square in row 4 that can be <6>

R6C2 is the only square in row 6 that can be <4>

R8C1 is the only square in row 8 that can be <6>

Squares R5C4 and R9C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R8C4 - removing <9> from <1389> leaving <138>

Squares R3C8 and R6C8 in column 8 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.

R5C8 - removing <29> from <2789> leaving <78>

R7C8 - removing <29> from <23789> leaving <378>

R8C8 - removing <9> from <3789> leaving <378>

Squares R6C7 and R6C8 in block 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 block.

R4C7 - removing <9> from <579> leaving <57>

R5C7 - removing <29> from <12579> leaving <157>

R5C9 - removing <29> from <125789> leaving <1578>

R4C2 is the only square in row 4 that can be <9>

Squares R7C2 and R7C3 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C1 - removing <7> from <479> leaving <49>

R7C5 - removing <1> from <134> leaving <34>

R7C7 - removing <7> from <279> leaving <29>

R7C8 - removing <7> from <378> leaving <38>

R7C9 - removing <7> from <2789> leaving <289>

Squares R6C7 and R7C7 in column 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 column.

R3C7 - removing <29> from <129> leaving <1>

R1C9 can only be <7>

R1C1 can only be <3>

R1C4 can only be <1>

R3C3 can only be <5>

R2C4 can only be <8>

R2C6 can only be <6>

R8C4 can only be <3>

R2C5 can only be <5>

R2C9 can only be <2>

R5C6 can only be <9>

R3C8 can only be <9>

R3C1 can only be <2>

R3C5 can only be <3>

R4C3 can only be <7>

R2C1 can only be <7>

R7C5 can only be <4>

R8C5 can only be <1>

R3C9 can only be <6>

R6C8 can only be <2>

R4C7 can only be <5>

R5C3 can only be <3>

R7C3 can only be <1>

R5C7 can only be <7>

R5C4 can only be <4>

R9C6 can only be <7>

R5C8 can only be <8>

R5C9 can only be <1>

R7C8 can only be <3>

R6C7 can only be <9>

R7C2 can only be <7>

R7C1 can only be <9>

R5C5 can only be <6>

R9C4 can only be <9>

R8C8 can only be <7>

R8C2 can only be <5>

R8C6 can only be <8>

R9C9 can only be <5>

R9C1 can only be <4>

R2C2 can only be <1>

R5C1 can only be <5>

R5C2 can only be <2>

R7C7 can only be <2>

R7C9 can only be <8>

R8C9 can only be <9>



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