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Daily Sudoku Answer 



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Jan 20 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s068730



Reasoning 



R2C8 can only be <1>

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

R5C5 is the only square in row 5 that can be <6>

R5C9 is the only square in row 5 that can be <7>

R6C5 is the only square in row 6 that can be <7>

R7C9 is the only square in row 7 that can be <1>

R4C5 is the only square in column 5 that can be <9>

R4C8 can only be <8>

R7C8 can only be <4>

R9C8 can only be <9>

R1C8 can only be <7>

R4C4 is the only square in row 4 that can be <2>

R8C3 is the only square in row 8 that can be <4>

R7C6 is the only square in column 6 that can be <6>

R2C3 is the only square in column 3 that can be <6>

Squares R2C7 and R2C9 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <5> from <358> leaving <38>

R2C5 - removing <5> from <358> leaving <38>

Squares R2C7 and R2C9 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C9 - removing <5> from <459> leaving <49>

R3C7 - removing <5> from <569> leaving <69>

R3C9 - removing <5> from <4569> leaving <469>

Intersection of row 4 with block 6. The value <5> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R6C9 - removing <5> from <359> leaving <39>

Intersection of row 5 with block 4. The value <8> 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.

R6C1 - removing <8> from <12589> leaving <1259>

R6C2 - removing <8> from <1258> leaving <125>

R6C3 - removing <8> from <589> leaving <59>

Intersection of column 5 with block 2. The values <14> 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 these values.

R3C6 - removing <1> from <18> leaving <8>

R3C4 can only be <5>

R2C5 can only be <3>

R2C1 can only be <8>

R5C3 is the only square in row 5 that can be <8>

R6C4 is the only square in row 6 that can be <8>

R7C4 can only be <3>

R7C3 can only be <5>

R7C1 can only be <2>

R6C3 can only be <9>

R6C9 can only be <3>

R1C3 can only be <3>

R5C1 can only be <1>

R6C6 can only be <1>

R4C9 can only be <5>

R7C5 can only be <8>

R9C2 can only be <8>

R8C5 can only be <2>

R9C5 can only be <5>

R8C2 can only be <7>

R4C7 can only be <1>

R2C9 can only be <2>

R5C7 can only be <9>

R6C1 can only be <5>

R3C7 can only be <6>

R6C2 can only be <2>

R1C1 can only be <9>

R4C6 can only be <3>

R3C2 can only be <1>

R1C9 can only be <4>

R3C1 can only be <7>

R1C5 can only be <1>

R2C7 can only be <5>

R9C9 can only be <6>

R3C5 can only be <4>

R1C2 can only be <5>

R3C9 can only be <9>

R8C7 can only be <3>

R8C1 can only be <6>

R9C7 can only be <2>

R9C1 can only be <3>

R8C9 can only be <8>



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