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Daily Sudoku Answer 



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The full reasoning can be found below the Sudoku.

Apr 02 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C2 can only be <2>

R3C5 is the only square in row 3 that can be <5>

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

R2C9 is the only square in column 9 that can be <7>

Squares R6C8 and R6C9 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C5 - removing <8> from <138> leaving <13>

Squares R1C7, R3C7 and R3C9 in block 3 form a simple naked triplet. These 3 squares all contain the 3 possibilities <146>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C8 - removing <46> from <3468> leaving <38>

R2C8 - removing <6> from <368> leaving <38>

Squares R1C8 and R2C8 in column 8 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 column.

R6C8 - removing <8> from <48> leaving <4>

R6C9 can only be <8>

Intersection of row 2 with block 1. The value <6> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C2 - removing <6> from <678> leaving <78>

R3C1 - removing <6> from <1469> leaving <149>

Intersection of row 3 with block 3. The value <6> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <6> from <146> leaving <14>

Intersection of column 3 with block 1. The value <1> only appears in one or more of squares R1C3, R2C3 and R3C3 of column 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C1 - removing <1> from <168> leaving <68>

R3C1 - removing <1> from <149> leaving <49>

R2C4 is the only square in row 2 that can be <1>

R1C6 can only be <6>

R5C6 can only be <8>

R2C8 is the only square in row 2 that can be <3>

R1C8 can only be <8>

R1C2 can only be <7>

Squares R8C2 and R8C8 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C1 - removing <6> from <467> leaving <47>

R8C4 - removing <5> from <257> leaving <27>

R8C9 - removing <56> from <12456> leaving <124>

R2C1 is the only square in column 1 that can be <6>

R2C2 can only be <8>

R9C5 is the only square in row 9 that can be <8>

R7C5 can only be <2>

R1C5 can only be <3>

R8C4 can only be <7>

R8C1 can only be <4>

R5C4 can only be <3>

R9C4 can only be <5>

R1C4 can only be <2>

R6C5 can only be <1>

R6C1 can only be <3>

R8C6 can only be <1>

R3C1 can only be <9>

R8C9 can only be <2>

R9C6 can only be <4>

R5C1 can only be <7>

R7C1 can only be <8>

R5C5 can only be <6>

R4C1 can only be <1>

R5C9 can only be <5>

R4C5 can only be <7>

R5C3 can only be <9>

R4C9 can only be <6>

R7C9 can only be <4>

R7C7 can only be <9>

R4C8 can only be <9>

R3C9 can only be <1>

R5C7 can only be <2>

R7C3 can only be <5>

R9C3 can only be <7>

R4C2 can only be <5>

R8C2 can only be <6>

R9C8 can only be <6>

R8C8 can only be <5>

R9C2 can only be <9>

R9C7 can only be <1>

R3C3 can only be <4>

R1C7 can only be <4>

R1C3 can only be <1>

R3C7 can only be <6>



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