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Daily Sudoku Answer 



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Oct 10 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C8 can only be <2>

R2C5 is the only square in row 2 that can be <3>

R9C5 can only be <2>

R5C1 is the only square in row 5 that can be <3>

R4C1 is the only square in column 1 that can be <6>

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

R3C4 is the only square in column 4 that can be <5>

Squares R7C6 and R8C5 in block 8 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 block.

R7C4 - removing <4> from <47> leaving <7>

Squares R7C7 and R9C8 in block 9 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 block.

R7C9 - removing <15> from <159> leaving <9>

R9C7 - removing <15> from <1578> leaving <78>

R7C6 can only be <4>

R8C5 can only be <9>

R1C5 can only be <4>

Intersection of column 2 with block 1. The value <2> only appears in one or more of squares R1C2, R2C2 and R3C2 of column 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C3 - removing <2> from <1289> leaving <189>

R2C1 - removing <2> from <124> leaving <14>

R3C1 - removing <2> from <247> leaving <47>

R3C3 - removing <2> from <249> leaving <49>

Squares R3C1 and R3C7 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C3 - removing <4> from <49> leaving <9>

R3C9 - removing <7> from <267> leaving <26>

R1C6 is the only square in row 1 that can be <9>

R8C9 is the only square in column 9 that can be <7>

R9C7 can only be <8>

R9C2 is the only square in row 9 that can be <7>

R1C7 is the only square in row 1 that can be <7>

R3C7 can only be <4>

R3C1 can only be <7>

R5C8 is the only square in column 8 that can be <4>

R5C2 can only be <1>

R5C9 can only be <6>

R3C9 can only be <2>

R3C6 can only be <6>

R9C6 can only be <3>

R1C4 can only be <2>

R9C4 can only be <6>

R1C2 can only be <8>

R1C3 can only be <1>

R8C2 can only be <4>

R1C8 can only be <6>

R9C3 can only be <5>

R2C1 can only be <4>

R2C2 can only be <2>

R8C1 can only be <8>

R6C1 can only be <2>

R9C8 can only be <1>

R7C3 can only be <2>

R2C8 can only be <5>

R7C7 can only be <5>

R2C9 can only be <1>

R4C9 can only be <8>

R6C9 can only be <5>

R6C6 can only be <1>

R7C1 can only be <1>

R4C3 can only be <4>

R4C6 can only be <2>

R6C7 can only be <3>

R4C4 can only be <3>

R6C3 can only be <8>

R4C7 can only be <1>

R6C4 can only be <4>



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