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Daily Sudoku Answer 



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Jun 23 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s045637



Reasoning 



R3C3 can only be <8>

R3C1 can only be <3>

R3C7 can only be <1>

R3C5 can only be <6>

R3C9 can only be <7>

R1C2 is the only square in row 1 that can be <6>

R1C6 is the only square in row 1 that can be <7>

R1C4 is the only square in row 1 that can be <2>

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

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

R6C2 is the only square in row 6 that can be <7>

R9C8 is the only square in row 9 that can be <7>

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

Squares R5C4 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C8 - removing <3> from <1238> leaving <128>

R5C9 - removing <3> from <138> leaving <18>

Intersection of row 1 with block 1. The value <4> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C2 - removing <4> from <459> leaving <59>

Intersection of row 1 with block 3. The values <38> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.

R2C8 - removing <38> from <3589> leaving <59>

Intersection of column 3 with block 7. The value <2> 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 <2> from <12489> leaving <1489>

R9C1 - removing <2> from <124589> leaving <14589>

Intersection of column 7 with block 9. The value <2> only appears in one or more of squares R7C7, R8C7 and R9C7 of column 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R8C8 - removing <2> from <1258> leaving <158>

R8C6 is the only square in row 8 that can be <2>

Squares R2C2 and R2C8 in row 2 and R8C2 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 2 and 8 can be removed.

R1C8 - removing <5> from <3589> leaving <389>

R4C2 - removing <5> from <15> leaving <1>

R4C8 - removing <5> from <1235> leaving <123>

R6C8 - removing <5> from <58> leaving <8>

R9C2 - removing <5> from <14589> leaving <1489>

R6C1 can only be <5>

R5C9 can only be <1>

R5C8 can only be <2>

R4C1 can only be <2>

R4C8 can only be <3>

R4C9 can only be <5>

R1C8 can only be <9>

R1C1 can only be <4>

R2C8 can only be <5>

R2C2 can only be <9>

R8C8 can only be <1>

R1C7 can only be <8>

R8C4 can only be <8>

R1C3 can only be <5>

R5C1 can only be <8>

R1C9 can only be <3>

R7C7 can only be <2>

R5C2 can only be <4>

R9C2 can only be <8>

R7C3 can only be <4>

R9C7 can only be <5>

R8C2 can only be <5>

R8C5 can only be <4>

R2C4 can only be <3>

R7C5 can only be <9>

R9C9 can only be <4>

R9C3 can only be <2>

R7C9 can only be <8>

R2C5 can only be <8>

R2C6 can only be <4>

R5C4 can only be <6>

R5C6 can only be <3>

R9C4 can only be <1>

R9C6 can only be <6>

R7C1 can only be <1>

R9C5 can only be <3>

R9C1 can only be <9>



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