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Daily Sudoku Answer 



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Dec 25 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s058104



Reasoning 



R4C4 can only be <2>

R6C4 can only be <9>

R6C6 can only be <6>

R8C5 can only be <8>

R4C6 can only be <1>

R4C8 can only be <5>

R2C6 can only be <5>

R5C5 can only be <7>

R4C2 can only be <3>

R5C1 can only be <4>

R6C8 can only be <4>

R6C2 can only be <7>

R8C4 can only be <5>

R2C5 can only be <1>

R9C5 can only be <3>

R1C5 can only be <6>

R2C4 can only be <8>

R8C6 can only be <2>

R5C2 can only be <5>

R1C8 is the only square in row 1 that can be <2>

R3C2 is the only square in row 3 that can be <6>

R9C2 can only be <8>

R7C3 is the only square in row 7 that can be <3>

R7C8 is the only square in row 7 that can be <8>

R9C1 is the only square in row 9 that can be <6>

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

Squares R9C8 and R9C9 in block 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C9 - removing <7> from <147> leaving <14>

Intersection of row 3 with block 3. The value <1> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C9 - removing <1> from <134> leaving <34>

Intersection of column 7 with block 3. The value <9> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R2C9 - removing <9> from <3479> leaving <347>

R3C8 - removing <9> from <179> leaving <17>

Squares R1C2 and R8C9 form a remote naked pair. <14> can be removed from any square that is common to their groups.

R1C9 - removing <4> from <34> leaving <3>

R1C1 can only be <1>

R1C2 can only be <4>

R8C1 can only be <7>

R7C2 can only be <1>

R7C7 can only be <4>

R2C7 can only be <9>

R8C9 can only be <1>

R8C3 can only be <4>

R2C1 can only be <3>

R5C9 can only be <9>

R2C3 can only be <7>

R3C7 can only be <1>

R3C8 can only be <7>

R3C3 can only be <9>

R9C8 can only be <9>

R2C9 can only be <4>

R5C8 can only be <1>

R9C9 can only be <7>



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