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Daily Sudoku Answer 



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Sep 09 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C6 can only be <3>

R1C2 is the only square in row 1 that can be <7>

R4C5 is the only square in row 4 that can be <5>

R4C6 is the only square in row 4 that can be <6>

R4C1 is the only square in row 4 that can be <9>

R2C2 is the only square in row 2 that can be <9>

R8C2 is the only square in column 2 that can be <5>

Intersection of row 6 with block 5. The value <9> only appears in one or more of squares R6C4, R6C5 and R6C6 of row 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R5C5 - removing <9> from <14789> leaving <1478>

R5C6 - removing <9> from <249> leaving <24>

Intersection of row 8 with block 7. The value <2> only appears in one or more of squares R8C1, R8C2 and R8C3 of row 8. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R9C2 - removing <2> from <128> leaving <18>

R9C3 - removing <2> from <246> leaving <46>

Intersection of block 2 with column 5. The value <4> only appears in one or more of squares R1C5, R2C5 and R3C5 of block 2. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain this value.

R5C5 - removing <4> from <1478> leaving <178>

R7C5 - removing <4> from <46> leaving <6>

R8C5 - removing <4> from <469> leaving <69>

R8C5 can only be <9>

R6C6 is the only square in row 6 that can be <9>

Squares R7C1 and R7C2 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C8 - removing <38> from <3478> leaving <47>

R7C9 - removing <38> from <3478> leaving <47>

R2C9 is the only square in column 9 that can be <8>

R1C8 can only be <6>

R1C3 can only be <5>

R1C7 can only be <1>

R1C4 can only be <8>

R2C7 is the only square in row 2 that can be <5>

R3C1 is the only square in row 3 that can be <6>

R9C2 is the only square in row 9 that can be <1>

R3C5 is the only square in row 3 that can be <1>

R2C5 can only be <4>

R2C1 is the only square in row 2 that can be <1>

R5C4 is the only square in row 5 that can be <1>

R5C6 is the only square in row 5 that can be <4>

R9C6 can only be <2>

R9C4 can only be <4>

R9C3 can only be <6>

R9C7 can only be <9>

R9C8 can only be <8>

R5C7 can only be <3>

R5C3 can only be <2>

R8C7 can only be <6>

R4C9 can only be <2>

R4C4 can only be <3>

R6C9 can only be <7>

R5C2 can only be <8>

R2C3 can only be <3>

R6C5 can only be <8>

R7C9 can only be <4>

R5C8 can only be <9>

R7C8 can only be <7>

R3C9 can only be <3>

R8C8 can only be <3>

R8C1 can only be <2>

R8C3 can only be <4>

R8C9 can only be <1>

R2C8 can only be <2>

R3C2 can only be <2>

R3C8 can only be <4>

R6C4 can only be <2>

R5C5 can only be <7>

R7C2 can only be <3>

R6C1 can only be <3>

R7C1 can only be <8>



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