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Daily Sudoku Answer 



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Dec 16 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C2 can only be <9>

R4C2 can only be <6>

R5C2 can only be <3>

R8C2 can only be <1>

R3C2 can only be <8>

R1C9 is the only square in row 1 that can be <5>

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

R3C5 can only be <1>

R3C4 is the only square in row 3 that can be <5>

R5C3 is the only square in row 5 that can be <5>

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

R6C5 is the only square in row 6 that can be <8>

R7C6 is the only square in row 7 that can be <1>

Intersection of row 6 with block 4. The value <7> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R5C1 - removing <7> from <247> leaving <24>

Intersection of column 6 with block 5. The value <9> only appears in one or more of squares R4C6, R5C6 and R6C6 of column 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R5C4 - removing <9> from <249> leaving <24>

Squares R5C1 and R5C4 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C5 - removing <2> from <27> leaving <7>

R5C6 - removing <24> from <2479> leaving <79>

R5C7 - removing <24> from <1246789> leaving <16789>

R5C8 - removing <24> from <2469> leaving <69>

R5C9 - removing <4> from <1478> leaving <178>

R5C6 can only be <9>

R7C5 can only be <2>

R5C8 can only be <6>

R7C4 can only be <9>

R2C7 is the only square in row 2 that can be <6>

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

R8C6 is the only square in column 6 that can be <7>

R8C1 can only be <4>

R8C3 can only be <6>

R5C1 can only be <2>

R8C4 can only be <8>

R9C4 can only be <6>

R5C4 can only be <4>

R6C1 can only be <7>

R2C4 can only be <2>

R4C6 can only be <2>

R6C3 can only be <4>

R6C8 can only be <2>

R1C6 can only be <3>

R1C1 can only be <9>

R3C6 can only be <4>

R2C6 can only be <8>

R1C7 can only be <1>

R9C1 can only be <3>

R3C3 can only be <3>

R1C3 can only be <2>

R5C7 can only be <8>

R2C9 can only be <4>

R2C8 can only be <3>

R4C9 can only be <7>

R3C7 can only be <9>

R2C3 can only be <1>

R7C3 can only be <7>

R4C7 can only be <4>

R9C9 can only be <8>

R5C9 can only be <1>

R9C3 can only be <9>

R9C7 can only be <7>

R7C8 can only be <4>

R4C8 can only be <9>

R7C7 can only be <3>



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