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Daily Sudoku Answer 



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Feb 01 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s257865



Reasoning 



R1C1 can only be <2>

R1C5 can only be <1>

R5C1 can only be <5>

R9C1 can only be <7>

R9C9 can only be <8>

R1C9 can only be <4>

R5C9 can only be <1>

R9C5 can only be <6>

R5C5 can only be <3>

R2C7 is the only square in row 2 that can be <3>

R3C2 is the only square in row 3 that can be <7>

R3C8 is the only square in row 3 that can be <8>

R3C4 is the only square in row 3 that can be <9>

R4C6 is the only square in row 4 that can be <1>

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

R7C3 is the only square in row 7 that can be <9>

R8C7 is the only square in row 8 that can be <2>

R8C2 is the only square in row 8 that can be <6>

Squares R4C5 and R4C7 in row 4 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 row.

R4C8 - removing <7> from <47> leaving <4>

Squares R4C5 and R6C5 in block 5 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.

R6C6 - removing <7> from <245678> leaving <24568>

Squares R5C4 and R5C6 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R6C4 - removing <46> from <24568> leaving <258>

R6C6 - removing <46> from <24568> leaving <258>

Squares R4C5, R4C7, R6C5 and R6C7 form a Type-1 Unique Rectangle on <79>.

R6C7 - removing <79> from <679> leaving <6>

R6C8 can only be <7>

R3C7 can only be <1>

R6C5 can only be <9>

R8C8 can only be <1>

R4C7 can only be <9>

R8C3 can only be <3>

R2C8 can only be <6>

R7C7 can only be <7>

R3C3 can only be <5>

R4C5 can only be <7>

R7C6 can only be <8>

R8C4 can only be <4>

R4C3 can only be <8>

R7C2 can only be <1>

R8C6 can only be <7>

R5C4 can only be <6>

R3C6 can only be <6>

R5C6 can only be <4>

R4C4 can only be <2>

R6C3 can only be <4>

R4C2 can only be <3>

R2C4 can only be <5>

R6C2 can only be <2>

R2C3 can only be <1>

R2C2 can only be <4>

R7C4 can only be <3>

R6C6 can only be <5>

R2C6 can only be <2>

R6C4 can only be <8>



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