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Daily Sudoku Answer 



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Sep 24 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C8 can only be <8>

R7C2 can only be <9>

R2C1 is the only square in row 2 that can be <6>

R2C3 is the only square in row 2 that can be <9>

R5C4 is the only square in row 5 that can be <9>

R5C6 is the only square in row 5 that can be <3>

R6C6 is the only square in column 6 that can be <1>

Intersection of row 2 with block 2. The values <78> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.

R1C5 - removing <7> from <123457> leaving <12345>

R3C4 - removing <8> from <2358> leaving <235>

Intersection of row 4 with block 6. The value <1> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R5C7 - removing <1> from <1246> leaving <246>

R5C9 - removing <1> from <1267> leaving <267>

Intersection of row 6 with block 4. The values <48> 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 these values.

R5C1 - removing <4> from <1245> leaving <125>

R5C2 - removing <4> from <46> leaving <6>

R5C3 - removing <4> from <1245> leaving <125>

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

R8C4 is the only square in column 4 that can be <6>

R2C4 is the only square in column 4 that can be <8>

Squares R4C4 and R4C5 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C7 - removing <2> from <126> leaving <16>

R4C9 - removing <2> from <126> leaving <16>

R5C7 is the only square in column 7 that can be <2>

R5C9 can only be <7>

R5C8 can only be <4>

R6C3 is the only square in column 3 that can be <2>

Intersection of column 4 with block 2. The value <3> only appears in one or more of squares R1C4, R2C4 and R3C4 of column 4. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C5 - removing <3> from <12345> leaving <1245>

R2C5 - removing <3> from <357> leaving <57>

R3C5 - removing <3> from <12345> leaving <1245>

R2C7 is the only square in row 2 that can be <3>

R1C9 can only be <2>

R3C9 can only be <9>

R3C8 can only be <5>

R8C9 can only be <8>

R7C8 can only be <7>

R7C1 can only be <2>

R9C8 can only be <9>

R7C6 is the only square in row 7 that can be <8>

R8C5 is the only square in row 8 that can be <9>

R9C6 is the only square in column 6 that can be <2>

Squares R2C5 and R2C6 in block 2 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.

R1C4 - removing <5> from <35> leaving <3>

R1C5 - removing <5> from <145> leaving <14>

R1C2 can only be <4>

R3C4 can only be <2>

R4C4 can only be <5>

R4C5 can only be <2>

R1C5 can only be <1>

R6C2 can only be <8>

R3C3 can only be <1>

R3C5 can only be <4>

R3C1 can only be <8>

R5C3 can only be <5>

R5C1 can only be <1>

R1C3 can only be <7>

R6C1 can only be <4>

R3C2 can only be <3>

R1C1 can only be <5>

R8C3 can only be <4>

R9C1 can only be <7>

R8C7 can only be <5>

R8C6 can only be <7>

R7C7 can only be <1>

R9C5 can only be <3>

R9C9 can only be <6>

R7C5 can only be <5>

R9C7 can only be <4>

R4C9 can only be <1>

R4C7 can only be <6>

R7C9 can only be <3>

R2C5 can only be <7>

R2C6 can only be <5>



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