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Daily Sudoku Answer 



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Jun 29 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s050727



Reasoning 



R2C1 can only be <2>

R2C2 can only be <4>

R3C7 can only be <3>

R7C3 can only be <3>

R3C3 can only be <9>

R3C4 is the only square in row 3 that can be <4>

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

R9C9 is the only square in row 9 that can be <9>

R9C8 is the only square in row 9 that can be <4>

R1C8 is the only square in column 8 that can be <2>

R8C9 is the only square in column 9 that can be <3>

R8C8 is the only square in row 8 that can be <5>

R2C8 can only be <8>

R7C7 can only be <6>

R2C5 can only be <7>

R5C8 can only be <6>

R2C9 can only be <5>

R1C9 can only be <7>

R8C2 is the only square in row 8 that can be <7>

R9C4 is the only square in row 9 that can be <7>

Squares R3C5 and R7C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C5 - removing <8> from <1389> leaving <139>

R9C5 - removing <8> from <1368> leaving <136>

Intersection of row 7 with block 8. The values <258> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R9C6 - removing <8> from <368> leaving <36>

Intersection of column 3 with block 4. The values <147> only appears in one or more of squares R4C3, R5C3 and R6C3 of column 3. 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 <1> from <1358> leaving <358>

R5C1 - removing <1> from <13589> leaving <3589>

R5C2 - removing <1> from <138> leaving <38>

R6C1 - removing <1> from <189> leaving <89>

Intersection of column 4 with block 5. The value <1> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. 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 <139> leaving <39>

Squares R3C5, R3C6, R7C5 and R7C6 form a Type-1 Unique Rectangle on <28>.

R7C6 - removing <28> from <258> leaving <5>

R7C4 can only be <8>

R7C5 can only be <2>

R4C4 can only be <1>

R3C5 can only be <8>

R3C6 can only be <2>

R4C3 can only be <7>

R6C4 can only be <6>

R1C4 can only be <5>

R4C7 can only be <5>

R5C7 can only be <1>

R5C3 can only be <4>

R6C7 can only be <7>

R5C9 can only be <8>

R6C3 can only be <1>

R5C2 can only be <3>

R6C9 can only be <4>

R5C5 can only be <9>

R1C2 can only be <1>

R4C1 can only be <8>

R5C1 can only be <5>

R1C5 can only be <6>

R6C6 can only be <8>

R6C1 can only be <9>

R4C6 can only be <3>

R1C1 can only be <3>

R9C2 can only be <8>

R1C6 can only be <9>

R8C5 can only be <1>

R9C6 can only be <6>

R8C1 can only be <6>

R9C5 can only be <3>

R9C1 can only be <1>



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