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Daily Sudoku Answer 



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Jan 18 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s023642



Reasoning 



R3C4 can only be <5>

R5C5 can only be <5>

R3C6 can only be <8>

R2C6 can only be <6>

R5C1 can only be <7>

R8C5 can only be <4>

R9C5 can only be <8>

R2C4 can only be <9>

R5C2 can only be <1>

R5C9 can only be <8>

R5C8 can only be <9>

R1C1 is the only square in row 1 that can be <6>

R9C1 can only be <5>

R1C3 is the only square in row 1 that can be <5>

R1C7 is the only square in row 1 that can be <9>

R2C8 is the only square in row 2 that can be <8>

R4C8 is the only square in row 4 that can be <6>

R6C3 is the only square in row 6 that can be <8>

R7C6 is the only square in row 7 that can be <1>

R8C6 can only be <5>

R7C8 is the only square in row 7 that can be <5>

R8C8 is the only square in row 8 that can be <2>

R9C9 is the only square in row 9 that can be <6>

R2C7 is the only square in column 7 that can be <4>

R4C3 is the only square in column 3 that can be <4>

Squares R4C2 and R6C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C2 - removing <3> from <237> leaving <27>

R3C2 - removing <3> from <2347> leaving <247>

R7C2 - removing <3> from <3467> leaving <467>

R8C2 - removing <3> from <367> leaving <67>

Squares R8C2 and R8C4 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C3 - removing <7> from <137> leaving <13>

R8C7 - removing <7> from <137> leaving <13>

Intersection of row 2 with block 1. The value <7> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R3C2 - removing <7> from <247> leaving <24>

Squares R4C2, R4C7, R6C2 and R6C7 form a Type-1 Unique Rectangle on <35>.

R6C7 - removing <35> from <357> leaving <7>

R6C8 can only be <3>

R9C7 can only be <1>

R6C2 can only be <5>

R3C8 can only be <7>

R4C7 can only be <5>

R9C3 can only be <7>

R8C7 can only be <3>

R4C2 can only be <3>

R8C3 can only be <1>

R7C9 can only be <7>

R2C3 can only be <3>

R8C2 can only be <6>

R2C5 can only be <2>

R3C1 can only be <4>

R2C2 can only be <7>

R1C5 can only be <3>

R3C2 can only be <2>

R7C1 can only be <3>

R3C9 can only be <3>

R1C9 can only be <2>

R7C4 can only be <6>

R8C4 can only be <7>

R7C2 can only be <4>



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