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Daily Sudoku Answer 



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Dec 26 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s046278



Reasoning 



R4C8 can only be <2>

R6C6 can only be <2>

R4C4 can only be <6>

R4C9 can only be <5>

R5C8 can only be <4>

R5C9 can only be <7>

R2C8 can only be <8>

R1C8 can only be <1>

R4C5 can only be <9>

R6C5 can only be <5>

R9C8 can only be <9>

R7C8 can only be <6>

R7C1 is the only square in row 7 that can be <9>

R6C1 can only be <7>

R6C2 can only be <9>

R7C3 is the only square in row 7 that can be <5>

R8C5 is the only square in row 8 that can be <6>

R9C7 is the only square in row 9 that can be <5>

R8C1 is the only square in column 1 that can be <1>

R2C3 is the only square in column 3 that can be <4>

R2C5 is the only square in row 2 that can be <7>

R7C4 is the only square in row 7 that can be <7>

R9C6 is the only square in column 6 that can be <4>

Squares R1C3 and R1C7 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C1 - removing <2> from <2358> leaving <358>

R1C2 - removing <27> from <25678> leaving <568>

R1C4 - removing <2> from <238> leaving <38>

Squares R1C4 and R5C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C4 - removing <38> from <1238> leaving <12>

R9C4 - removing <8> from <128> leaving <12>

Intersection of column 1 with block 1. The values <38> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.

R1C2 - removing <8> from <568> leaving <56>

R3C2 - removing <8> from <2678> leaving <267>

Intersection of block 2 with row 3. The values <12> only appears in one or more of squares R3C4, R3C5 and R3C6 of block 2. These squares are the ones that intersect with row 3. Thus, the other (non-intersecting) squares of row 3 cannot contain these values.

R3C1 - removing <2> from <238> leaving <38>

R3C2 - removing <2> from <267> leaving <67>

R3C7 - removing <2> from <247> leaving <47>

R3C9 - removing <2> from <234> leaving <34>

Intersection of block 8 with row 7. The value <8> only appears in one or more of squares R7C4, R7C5 and R7C6 of block 8. These squares are the ones that intersect with row 7. Thus, the other (non-intersecting) squares of row 7 cannot contain this value.

R7C9 - removing <8> from <128> leaving <12>

Squares R5C4, R5C6, R1C4 and R1C6 form a Type-1 Unique Rectangle on <38>.

R1C6 - removing <38> from <368> leaving <6>

R1C2 can only be <5>

R5C2 can only be <2>

R5C1 can only be <5>

R8C2 can only be <8>

R9C2 can only be <7>

R9C3 can only be <2>

R3C2 can only be <6>

R9C4 can only be <1>

R1C3 can only be <7>

R9C9 can only be <8>

R3C4 can only be <2>

R7C6 can only be <8>

R1C7 can only be <2>

R8C7 can only be <4>

R2C9 can only be <3>

R2C1 can only be <2>

R3C9 can only be <4>

R3C5 can only be <8>

R3C1 can only be <3>

R7C5 can only be <2>

R1C4 can only be <3>

R3C7 can only be <7>

R8C9 can only be <2>

R7C9 can only be <1>

R5C6 can only be <3>

R1C1 can only be <8>

R5C4 can only be <8>

R3C6 can only be <1>



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