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Daily Sudoku Answer 



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Oct 12 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s075881



Reasoning 



R1C1 can only be <5>

R2C2 can only be <8>

R3C1 can only be <6>

R9C1 can only be <1>

R7C1 can only be <3>

R5C1 can only be <8>

R1C5 is the only square in row 1 that can be <4>

R1C7 is the only square in row 1 that can be <1>

R2C6 is the only square in row 2 that can be <3>

R6C3 is the only square in row 6 that can be <3>

R5C9 is the only square in row 5 that can be <3>

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

R6C8 is the only square in row 6 that can be <1>

R4C2 is the only square in row 4 that can be <1>

R8C5 is the only square in row 8 that can be <6>

R9C3 is the only square in row 9 that can be <6>

R3C7 is the only square in column 7 that can be <9>

R3C9 is the only square in row 3 that can be <8>

R4C8 is the only square in column 8 that can be <8>

R6C6 is the only square in row 6 that can be <8>

Squares R3C3 and R3C6 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C4 - removing <27> from <1257> leaving <15>

R3C5 - removing <7> from <157> leaving <15>

Intersection of row 9 with block 9. The value <4> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C7 - removing <4> from <2458> leaving <258>

R7C9 - removing <4> from <24> leaving <2>

R1C9 can only be <7>

R1C3 can only be <2>

R9C9 can only be <4>

R2C8 can only be <2>

R3C3 can only be <7>

R3C6 can only be <2>

R5C7 is the only square in row 5 that can be <2>

R8C4 is the only square in row 8 that can be <2>

Intersection of row 5 with block 4. The value <4> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R4C3 - removing <4> from <459> leaving <59>

Squares R5C2 and R8C2 in column 2 and R5C8 and R8C8 in column 8 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in rows 5 and 8 can be removed.

R5C3 - removing <5> from <459> leaving <49>

R5C5 - removing <5> from <579> leaving <79>

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

R3C4 can only be <1>

R7C5 is the only square in row 7 that can be <1>

R7C7 is the only square in row 7 that can be <8>

R9C7 can only be <7>

R9C5 can only be <8>

R8C8 can only be <5>

R8C2 can only be <4>

R5C8 can only be <7>

R5C5 can only be <9>

R8C6 can only be <7>

R5C2 can only be <5>

R7C3 can only be <5>

R4C3 can only be <9>

R5C3 can only be <4>

R2C5 can only be <7>

R4C6 can only be <4>

R2C4 can only be <9>

R4C7 can only be <5>

R7C6 can only be <9>

R6C4 can only be <5>

R4C4 can only be <7>

R6C7 can only be <4>

R7C4 can only be <4>



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