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Daily Sudoku Answer 



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Oct 17 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R9C7 can only be <3>

R9C1 can only be <6>

R9C9 can only be <5>

R2C8 is the only square in row 2 that can be <1>

R2C7 is the only square in row 2 that can be <4>

R2C2 is the only square in row 2 that can be <5>

R3C5 is the only square in row 3 that can be <2>

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

R4C4 is the only square in row 4 that can be <2>

R5C2 is the only square in row 5 that can be <2>

R5C8 is the only square in row 5 that can be <5>

R6C8 can only be <3>

R4C5 is the only square in row 4 that can be <3>

R6C5 is the only square in row 6 that can be <5>

R6C4 is the only square in row 6 that can be <1>

R5C9 is the only square in row 5 that can be <1>

R8C7 is the only square in row 8 that can be <2>

R8C2 is the only square in column 2 that can be <3>

R2C6 is the only square in column 6 that can be <9>

Squares R2C3 and R3C2 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C3 - removing <68> from <3689> leaving <39>

Intersection of row 2 with block 2. The value <7> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C5 - removing <7> from <678> leaving <68>

Intersection of row 8 with block 8. The value <4> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R7C5 - removing <4> from <4678> leaving <678>

R8C5 is the only square in column 5 that can be <4>

R8C3 is the only square in row 8 that can be <1>

R9C3 can only be <8>

R9C5 can only be <1>

R2C3 can only be <6>

R7C2 can only be <4>

R5C3 can only be <3>

R3C2 can only be <8>

R5C1 can only be <4>

R1C3 can only be <9>

R7C1 can only be <9>

R6C2 can only be <6>

R3C1 can only be <7>

R1C1 can only be <3>

R6C6 can only be <4>

R7C5 is the only square in row 7 that can be <8>

R1C5 can only be <6>

R2C5 can only be <7>

R1C9 can only be <7>

R1C7 can only be <8>

R7C9 can only be <6>

R2C4 can only be <8>

R7C8 can only be <7>

R3C9 can only be <9>

R5C7 can only be <7>

R3C8 can only be <6>

R5C4 can only be <6>

R4C8 can only be <8>

R8C8 can only be <9>

R4C6 can only be <7>

R5C6 can only be <8>

R8C4 can only be <7>

R8C6 can only be <6>



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