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Daily Sudoku Answer 



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Apr 07 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s045944



Reasoning 



R1C3 is the only square in row 1 that can be <2>

R4C9 is the only square in row 4 that can be <2>

R5C5 is the only square in row 5 that can be <8>

R2C1 is the only square in row 2 that can be <8>

R8C1 is the only square in row 8 that can be <2>

R9C6 is the only square in row 9 that can be <2>

R3C3 is the only square in column 3 that can be <6>

R6C5 is the only square in column 5 that can be <9>

R1C5 is the only square in column 5 that can be <6>

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

R5C8 is the only square in column 8 that can be <1>

Intersection of row 5 with block 4. The values <39> 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 these values.

R4C1 - removing <3> from <1347> leaving <147>

Intersection of column 3 with block 7. The value <1> only appears in one or more of squares R7C3, R8C3 and R9C3 of column 3. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R7C1 - removing <1> from <1349> leaving <349>

Intersection of column 9 with block 6. The value <7> only appears in one or more of squares R4C9, R5C9 and R6C9 of column 9. 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 <7> from <467> leaving <46>

Squares R2C5 and R2C9 in row 2 and R8C5 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 5 and 9 can be removed.

R3C9 - removing <4> from <3459> leaving <359>

R4C5 - removing <4> from <134> leaving <13>

R5C9 - removing <4> from <467> leaving <67>

R6C9 - removing <4> from <47> leaving <7>

R7C9 - removing <4> from <3469> leaving <369>

R9C5 - removing <4> from <1345> leaving <135>

R5C9 can only be <6>

R5C7 can only be <4>

R5C3 can only be <9>

R5C2 can only be <3>

R5C1 can only be <7>

R4C4 is the only square in row 4 that can be <7>

R7C7 is the only square in row 7 that can be <6>

R7C1 is the only square in column 1 that can be <3>

R7C9 can only be <9>

R9C2 is the only square in row 9 that can be <9>

R1C2 can only be <4>

R1C8 can only be <7>

R3C1 can only be <9>

R9C8 can only be <4>

R3C7 can only be <3>

R3C9 can only be <5>

R1C7 can only be <9>

R9C7 can only be <7>

R2C9 can only be <4>

R9C3 can only be <1>

R8C9 can only be <3>

R2C5 can only be <5>

R8C5 can only be <4>

R7C3 can only be <4>

R9C5 can only be <3>

R9C4 can only be <5>

R4C5 can only be <1>

R4C1 can only be <4>

R6C4 can only be <4>

R6C1 can only be <1>

R3C4 can only be <1>

R4C6 can only be <3>

R3C6 can only be <4>

R7C4 can only be <8>

R1C6 can only be <8>

R7C6 can only be <1>

R1C4 can only be <3>



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