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Daily Sudoku Answer 



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Aug 11 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s048961



Reasoning 



R3C7 can only be <5>

R7C3 can only be <5>

R7C7 can only be <2>

R7C5 can only be <7>

R8C2 can only be <3>

R5C7 can only be <6>

R8C1 can only be <9>

R9C2 can only be <4>

R8C9 can only be <5>

R8C8 can only be <1>

R8C5 can only be <8>

R9C8 can only be <9>

R1C5 is the only square in row 1 that can be <9>

R4C9 is the only square in row 4 that can be <9>

R4C1 is the only square in row 4 that can be <3>

R5C8 is the only square in row 5 that can be <2>

R5C1 is the only square in row 5 that can be <8>

R6C9 is the only square in row 6 that can be <3>

R6C2 is the only square in row 6 that can be <6>

R9C5 is the only square in row 9 that can be <3>

Squares R2C1 and R2C9 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C2 - removing <7> from <127> leaving <12>

R2C4 - removing <4> from <124568> leaving <12568>

R2C5 - removing <4> from <145> leaving <15>

R2C8 - removing <47> from <467> leaving <6>

Squares R1C6 and R8C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C6 - removing <2> from <1258> leaving <158>

Intersection of row 6 with block 5. The value <1> 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 <1> from <145> leaving <45>

Intersection of column 5 with block 2. The value <1> only appears in one or more of squares R1C5, R2C5 and R3C5 of column 5. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R2C4 - removing <1> from <1258> leaving <258>

R2C6 - removing <1> from <158> leaving <58>

Squares R1C4 and R1C8 in row 1 and R4C4 and R4C8 in row 4 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 4 and 8 can be removed.

R6C4 - removing <4> from <145> leaving <15>

R6C8 - removing <4> from <457> leaving <57>

R6C1 is the only square in row 6 that can be <4>

R2C1 can only be <7>

R5C3 can only be <1>

R2C9 can only be <4>

R1C2 can only be <2>

R5C9 can only be <7>

R1C8 can only be <7>

R3C3 can only be <4>

R5C2 can only be <5>

R6C8 can only be <5>

R6C4 can only be <1>

R4C8 can only be <4>

R1C6 can only be <6>

R2C2 can only be <1>

R1C4 can only be <4>

R8C6 can only be <2>

R2C5 can only be <5>

R2C6 can only be <8>

R5C5 can only be <4>

R2C4 can only be <2>

R3C5 can only be <1>

R4C2 can only be <7>

R6C6 can only be <7>

R9C4 can only be <5>

R4C6 can only be <5>

R8C4 can only be <6>

R9C6 can only be <1>

R4C4 can only be <8>



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