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Daily Sudoku Answer 



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Dec 19 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s084872



Reasoning 



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

R1C3 is the only square in row 1 that can be <9>

R4C4 is the only square in row 4 that can be <9>

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

R9C7 is the only square in row 9 that can be <8>

R9C5 is the only square in block 8 that can be <2>

Squares R3C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C3 - removing <17> from <137> leaving <3>

R6C3 - removing <1> from <1236> leaving <236>

R8C3 - removing <17> from <1267> leaving <26>

R6C2 is the only square in row 6 that can be <1>

Squares R1C2 and R1C9 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C1 - removing <57> from <1457> leaving <14>

R1C5 - removing <57> from <1457> leaving <14>

Intersection of row 3 with block 2. The values <58> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.

R2C6 - removing <58> from <1458> leaving <14>

Squares R1C5 and R2C6 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R3C5 - removing <1> from <157> leaving <57>

R3C6 - removing <1> from <158> leaving <58>

R3C3 is the only square in row 3 that can be <1>

R9C3 can only be <7>

R1C1 can only be <4>

R1C5 can only be <1>

R2C6 can only be <4>

R7C6 is the only square in column 6 that can be <1>

R7C7 can only be <5>

R9C8 can only be <1>

R9C1 can only be <5>

R8C7 can only be <3>

R4C7 can only be <6>

R8C2 can only be <2>

R2C7 can only be <1>

R8C3 can only be <6>

R8C1 can only be <1>

R6C3 can only be <2>

R2C9 is the only square in row 2 that can be <6>

R5C8 is the only square in row 5 that can be <2>

R4C6 is the only square in row 4 that can be <2>

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

R5C1 is the only square in row 5 that can be <6>

R6C8 is the only square in row 6 that can be <3>

R4C8 can only be <5>

R4C5 can only be <3>

R2C8 can only be <7>

R2C1 can only be <8>

R8C8 can only be <4>

R1C9 can only be <5>

R5C5 can only be <4>

R5C9 can only be <8>

R7C5 can only be <7>

R5C2 can only be <3>

R6C9 can only be <4>

R8C9 can only be <7>

R7C4 can only be <4>

R3C5 can only be <5>

R8C4 can only be <5>

R1C2 can only be <7>

R2C2 can only be <5>

R4C1 can only be <7>

R3C6 can only be <8>

R3C4 can only be <7>

R6C6 can only be <5>

R4C2 can only be <8>

R6C4 can only be <8>



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