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Daily Sudoku Answer 



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Aug 14 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s044146



Reasoning 



R2C3 can only be <1>

R2C7 can only be <4>

R2C9 can only be <2>

R2C1 can only be <9>

R4C2 is the only square in row 4 that can be <2>

R4C6 is the only square in row 4 that can be <9>

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

R8C1 is the only square in row 8 that can be <8>

R9C2 is the only square in row 9 that can be <9>

R5C1 is the only square in column 1 that can be <6>

R7C2 is the only square in column 2 that can be <4>

R6C2 is the only square in column 2 that can be <1>

R6C7 can only be <3>

R6C6 can only be <5>

R4C7 can only be <1>

R8C7 can only be <7>

R9C6 is the only square in row 9 that can be <7>

Squares R1C9 and R3C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C9 - removing <7> from <457> leaving <45>

R7C9 - removing <1> from <1356> leaving <356>

R9C9 - removing <1> from <13456> leaving <3456>

R5C8 is the only square in row 5 that can be <7>

Squares R1C9 and R3C9 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C8 - removing <1> from <189> leaving <89>

R3C8 - removing <1> from <189> leaving <89>

Intersection of column 5 with block 8. The value <6> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R7C4 - removing <6> from <2356> leaving <235>

R9C4 - removing <6> from <356> leaving <35>

Intersection of column 9 with block 9. The values <36> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.

R7C8 - removing <6> from <156> leaving <15>

R9C8 - removing <6> from <1456> leaving <145>

Squares R5C2 and R8C9 form a remote naked pair. <35> can be removed from any square that is common to their groups.

R5C9 - removing <5> from <45> leaving <4>

R5C5 can only be <3>

R6C8 can only be <6>

R6C4 can only be <4>

R4C8 can only be <5>

R4C3 can only be <3>

R7C8 can only be <1>

R5C2 can only be <5>

R9C5 can only be <6>

R4C4 can only be <6>

R9C8 can only be <4>

R7C5 can only be <8>

R8C3 can only be <5>

R3C5 can only be <9>

R8C9 can only be <3>

R7C1 can only be <3>

R9C9 can only be <5>

R9C4 can only be <3>

R7C9 can only be <6>

R3C8 can only be <8>

R1C5 can only be <4>

R1C8 can only be <9>

R7C6 can only be <2>

R1C1 can only be <2>

R9C1 can only be <1>

R7C4 can only be <5>

R3C6 can only be <3>

R1C4 can only be <1>

R3C1 can only be <5>

R1C9 can only be <7>

R3C4 can only be <2>

R1C2 can only be <3>

R3C9 can only be <1>

R3C2 can only be <7>

R1C6 can only be <8>



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