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Daily Sudoku Answer 



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Oct 17 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s030349



Reasoning 



R5C5 can only be <4>

R8C2 can only be <2>

R9C2 can only be <6>

R2C5 is the only square in row 2 that can be <7>

R3C5 is the only square in row 3 that can be <6>

R4C9 is the only square in row 4 that can be <4>

R5C1 is the only square in row 5 that can be <6>

R6C1 is the only square in row 6 that can be <8>

R2C2 is the only square in row 2 that can be <8>

R5C8 is the only square in row 5 that can be <8>

R8C5 is the only square in row 8 that can be <3>

R1C5 can only be <8>

R7C4 is the only square in row 7 that can be <8>

R9C9 is the only square in row 9 that can be <5>

Squares R2C9 and R3C7 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C8 - removing <9> from <1249> leaving <124>

R1C9 - removing <39> from <1239> leaving <12>

R2C8 - removing <9> from <49> leaving <4>

Squares R2C1 and R4C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C1 - removing <39> from <349> leaving <4>

R7C3 is the only square in column 3 that can be <4>

R7C6 can only be <7>

R9C1 is the only square in row 9 that can be <7>

R8C1 can only be <1>

R8C8 can only be <9>

R8C9 can only be <7>

R6C7 is the only square in row 6 that can be <7>

Squares R1C9 and R6C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C9 - removing <1> from <139> leaving <39>

Intersection of row 1 with block 2. The value <9> only appears in one or more of squares R1C4, R1C5 and R1C6 of row 1. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R3C4 - removing <9> from <459> leaving <45>

R3C6 - removing <9> from <349> leaving <34>

Squares R3C7 and R4C1 form a remote naked pair. <39> can be removed from any square that is common to their groups.

R4C7 - removing <39> from <239> leaving <2>

R4C3 can only be <9>

R7C7 can only be <1>

R6C9 can only be <1>

R6C3 can only be <2>

R1C9 can only be <2>

R7C5 can only be <2>

R9C8 can only be <2>

R9C5 can only be <1>

R1C8 can only be <1>

R4C1 can only be <3>

R3C3 can only be <5>

R3C4 can only be <4>

R5C3 can only be <1>

R1C2 can only be <3>

R3C6 can only be <3>

R9C4 can only be <9>

R3C7 can only be <9>

R1C6 can only be <9>

R5C7 can only be <3>

R2C9 can only be <3>

R2C1 can only be <9>

R5C2 can only be <5>

R5C9 can only be <9>

R9C6 can only be <4>

R1C4 can only be <5>



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