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Daily Sudoku Answer 



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Aug 21 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s032686



Reasoning 



R6C8 can only be <2>

R6C1 can only be <4>

R8C8 can only be <7>

R2C7 is the only square in row 2 that can be <7>

R4C5 is the only square in row 4 that can be <4>

R4C7 is the only square in row 4 that can be <9>

R4C4 is the only square in row 4 that can be <8>

R6C3 is the only square in row 6 that can be <7>

R6C7 is the only square in row 6 that can be <8>

R8C7 is the only square in row 8 that can be <4>

R7C6 is the only square in row 7 that can be <4>

R8C3 is the only square in row 8 that can be <2>

R4C1 is the only square in row 4 that can be <2>

R7C7 is the only square in row 7 that can be <2>

R8C4 is the only square in row 8 that can be <9>

R9C4 is the only square in row 9 that can be <7>

R7C2 is the only square in row 7 that can be <7>

Squares R9C7 and R9C9 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C1 - removing <6> from <689> leaving <89>

R9C3 - removing <16> from <15689> leaving <589>

R9C6 - removing <1> from <158> leaving <58>

Squares R2C8 and R3C8 in block 3 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 block.

R1C7 - removing <6> from <156> leaving <15>

R1C9 - removing <6> from <1456> leaving <145>

R3C7 - removing <6> from <1356> leaving <135>

R3C9 - removing <6> from <13456> leaving <1345>

Intersection of row 1 with block 1. The value <6> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C2 - removing <6> from <16> leaving <1>

R2C3 - removing <6> from <1689> leaving <189>

R3C3 - removing <6> from <14689> leaving <1489>

R8C2 can only be <5>

R8C5 can only be <1>

R4C2 can only be <6>

R7C4 can only be <3>

R7C5 can only be <8>

R7C1 can only be <6>

R9C6 can only be <5>

R7C3 can only be <1>

R1C1 can only be <9>

R9C1 can only be <8>

R2C3 can only be <8>

R3C3 can only be <4>

R9C3 can only be <9>

R1C3 can only be <6>

R1C9 is the only square in row 1 that can be <4>

R3C6 is the only square in row 3 that can be <8>

R3C8 is the only square in row 3 that can be <9>

R2C8 can only be <6>

R2C5 can only be <3>

R2C6 can only be <9>

R6C5 can only be <5>

R6C9 can only be <3>

R3C5 can only be <6>

R5C4 can only be <2>

R6C6 can only be <1>

R4C9 can only be <5>

R4C3 can only be <3>

R3C9 can only be <1>

R5C7 can only be <6>

R5C6 can only be <3>

R5C3 can only be <5>

R9C7 can only be <1>

R1C6 can only be <2>

R9C9 can only be <6>

R1C7 can only be <5>

R1C4 can only be <1>

R3C7 can only be <3>

R3C4 can only be <5>



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