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Daily Sudoku Answer 



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Sep 28 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C4 can only be <7>

R8C4 can only be <8>

R9C4 can only be <2>

R4C6 can only be <2>

R8C6 can only be <7>

R8C5 can only be <3>

R2C4 can only be <1>

R7C5 can only be <6>

R5C5 can only be <5>

R3C5 can only be <2>

R2C5 can only be <7>

R8C7 is the only square in row 8 that can be <9>

R7C7 can only be <7>

R7C8 can only be <1>

R7C2 can only be <2>

R7C1 can only be <9>

R5C8 is the only square in row 5 that can be <9>

R9C7 is the only square in column 7 that can be <5>

R8C9 can only be <4>

R8C2 can only be <1>

R9C9 can only be <6>

R8C3 can only be <5>

R1C3 is the only square in column 3 that can be <1>

Squares R4C2<47>, R5C1<48>, R5C2<4678> and R5C3<467> in block 4 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <4678>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C1 - removing <4> from <145> leaving <15>

R6C2 - removing <6> from <36> leaving <3>

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

Squares R4C2 and R9C2 in column 2 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 column.

R3C2 - removing <4> from <468> leaving <68>

R5C2 - removing <47> from <4678> leaving <68>

Intersection of row 3 with block 1. The value <6> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C3 - removing <6> from <346> leaving <34>

Squares R2C3 and R2C8 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <34> from <2348> leaving <28>

R2C7 - removing <4> from <246> leaving <26>

R5C7 is the only square in column 7 that can be <4>

R5C1 can only be <8>

R5C2 can only be <6>

R2C1 can only be <2>

R5C3 can only be <7>

R3C2 can only be <8>

R5C9 can only be <2>

R4C2 can only be <4>

R2C7 can only be <6>

R1C1 can only be <3>

R2C6 can only be <8>

R1C7 can only be <2>

R3C9 can only be <5>

R3C8 can only be <4>

R6C9 can only be <1>

R9C2 can only be <7>

R6C1 can only be <5>

R4C9 can only be <7>

R1C8 can only be <7>

R9C1 can only be <4>

R2C3 can only be <4>

R1C9 can only be <8>

R4C8 can only be <5>

R1C6 can only be <6>

R2C8 can only be <3>

R3C3 can only be <6>

R9C3 can only be <3>

R4C1 can only be <1>



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