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Daily Sudoku Answer 



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Dec 07 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s048113



Reasoning 



R1C5 can only be <3>

R9C9 can only be <1>

R9C5 can only be <7>

R1C7 is the only square in row 1 that can be <2>

R6C5 is the only square in row 6 that can be <1>

R7C8 is the only square in row 7 that can be <7>

R8C7 is the only square in row 8 that can be <6>

R2C6 is the only square in block 2 that can be <6>

R4C5 is the only square in row 4 that can be <6>

R5C5 can only be <4>

Squares R2C4 and R3C4 in column 4 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 column.

R5C4 - removing <5> from <3589> leaving <389>

R6C4 - removing <5> from <359> leaving <39>

Squares R1C1 and R1C3 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C1 - removing <5> from <1359> leaving <139>

R2C3 - removing <5> from <13579> leaving <1379>

R3C1 - removing <5> from <135> leaving <13>

R3C3 - removing <5> from <1356> leaving <136>

Intersection of row 6 with block 4. The value <4> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R4C1 - removing <4> from <3459> leaving <359>

R1C1 is the only square in column 1 that can be <4>

R1C3 can only be <5>

R6C9 is the only square in row 6 that can be <5>

R7C9 can only be <9>

R4C8 can only be <4>

R7C2 can only be <3>

R8C9 can only be <2>

R5C9 can only be <3>

R8C8 can only be <8>

R4C7 can only be <9>

R8C4 can only be <3>

R7C7 can only be <5>

R9C7 can only be <4>

R9C3 can only be <8>

R5C7 can only be <1>

R5C8 can only be <2>

R2C7 can only be <3>

R8C6 can only be <1>

R6C4 can only be <9>

R7C6 can only be <8>

R7C3 can only be <1>

R3C7 can only be <8>

R6C2 can only be <4>

R5C4 can only be <8>

R5C6 can only be <5>

R5C1 can only be <9>

R4C6 can only be <3>

R6C3 can only be <3>

R8C2 can only be <9>

R3C3 can only be <6>

R4C1 can only be <5>

R8C3 can only be <4>

R3C2 can only be <2>

R5C3 can only be <7>

R2C1 can only be <1>

R5C2 can only be <6>

R2C3 can only be <9>

R2C8 can only be <5>

R3C1 can only be <3>

R2C4 can only be <2>

R3C8 can only be <1>

R3C4 can only be <5>

R2C2 can only be <7>



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