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Daily Sudoku Answer 



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Mar 13 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C6 is the only square in row 1 that can be <3>

R4C7 is the only square in row 4 that can be <9>

R6C3 is the only square in row 6 that can be <4>

R5C4 is the only square in row 5 that can be <4>

R6C9 is the only square in row 6 that can be <8>

R7C3 is the only square in row 7 that can be <3>

R8C5 is the only square in row 8 that can be <8>

R2C4 is the only square in row 2 that can be <8>

R8C3 is the only square in column 3 that can be <6>

Squares R9C1 and R9C2 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C4 - removing <5> from <569> leaving <69>

R9C9 - removing <7> from <679> leaving <69>

Squares R9C1 and R9C2 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C1 - removing <7> from <147> leaving <14>

R8C2 - removing <7> from <147> leaving <14>

Squares R8C1 and R8C2 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C8 - removing <14> from <1479> leaving <79>

Intersection of row 4 with block 5. The value <6> only appears in one or more of squares R4C4, R4C5 and R4C6 of row 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R5C6 - removing <6> from <567> leaving <57>

Squares R5C6 and R6C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R7C6 - removing <57> from <2567> leaving <26>

R8C6 - removing <7> from <79> leaving <9>

R8C8 can only be <7>

R9C4 can only be <6>

R9C9 can only be <9>

R7C4 can only be <5>

R7C6 can only be <2>

R4C4 can only be <1>

R7C5 can only be <7>

R3C6 can only be <6>

R4C3 can only be <7>

R3C4 can only be <9>

R6C5 can only be <3>

R4C1 can only be <5>

R6C8 can only be <1>

R4C5 can only be <6>

R1C8 can only be <4>

R7C8 can only be <6>

R4C2 can only be <3>

R9C1 can only be <7>

R7C9 can only be <1>

R2C8 can only be <9>

R5C8 can only be <3>

R7C7 can only be <4>

R1C9 can only be <2>

R9C2 can only be <5>

R1C1 can only be <1>

R8C1 can only be <4>

R3C3 can only be <8>

R5C3 can only be <1>

R5C2 can only be <2>

R8C2 can only be <1>

R3C1 can only be <2>

R3C5 can only be <1>

R5C1 can only be <8>

R2C2 can only be <7>

R3C7 can only be <7>

R2C5 can only be <2>

R3C2 can only be <4>

R6C7 can only be <5>

R2C9 can only be <6>

R6C6 can only be <7>

R5C7 can only be <6>

R2C7 can only be <1>

R5C9 can only be <7>

R5C6 can only be <5>



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