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Daily Sudoku Answer 



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Jan 04 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s270938



Reasoning 



R3C7 can only be <6>

R7C3 can only be <2>

R7C7 can only be <1>

R3C3 can only be <8>

R5C3 can only be <9>

R7C5 can only be <4>

R5C7 can only be <5>

R3C5 can only be <2>

R8C4 can only be <5>

R9C9 is the only square in row 9 that can be <7>

R9C8 is the only square in row 9 that can be <5>

Squares R1C1 and R1C2 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.

R1C8 - removing <2> from <128> leaving <18>

R1C9 - removing <2> from <125> leaving <15>

Squares R4C2 and R4C4 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C8 - removing <4> from <149> leaving <19>

Squares R8C8 and R8C9 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C1 - removing <4> from <469> leaving <69>

R8C2 - removing <4> from <1469> leaving <169>

Squares R1C1 and R1C2 in block 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 block.

R2C1 - removing <2> from <269> leaving <69>

R2C2 - removing <2> from <269> leaving <69>

Squares R2C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R9C1 - removing <6> from <46> leaving <4>

Squares R2C1, R2C2, R8C1 and R8C2 form a Type-1 Unique Rectangle on <69>.

R8C2 - removing <69> from <169> leaving <1>

R8C6 can only be <6>

R9C2 can only be <6>

R8C1 can only be <9>

R9C5 can only be <1>

R2C2 can only be <9>

R5C5 can only be <8>

R2C1 can only be <6>

R1C5 can only be <5>

R1C9 can only be <1>

R4C5 can only be <9>

R2C6 can only be <3>

R1C8 can only be <8>

R5C9 can only be <4>

R2C4 can only be <8>

R6C6 can only be <2>

R4C8 can only be <1>

R6C5 can only be <6>

R4C6 can only be <5>

R5C4 can only be <7>

R8C9 can only be <2>

R6C8 can only be <9>

R6C2 can only be <4>

R5C6 can only be <1>

R8C8 can only be <4>

R2C9 can only be <5>

R2C8 can only be <2>

R5C1 can only be <2>

R4C4 can only be <4>

R6C4 can only be <3>

R4C2 can only be <7>

R1C2 can only be <2>

R1C1 can only be <7>



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