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Daily Sudoku Answer 



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Oct 21 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s292590



Reasoning 



R6C1 can only be <5>

R6C4 can only be <4>

R6C6 can only be <7>

R3C8 is the only square in row 3 that can be <7>

R9C3 is the only square in row 9 that can be <7>

R5C2 is the only square in row 5 that can be <7>

R1C1 is the only square in column 1 that can be <2>

Squares R1C4 and R1C6 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C3 - removing <59> from <13459> leaving <134>

R1C9 - removing <9> from <1349> leaving <134>

R3C9 is the only square in column 9 that can be <9>

R3C7 is the only square in row 3 that can be <8>

Squares R1C4 and R1C6 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C5 - removing <9> from <469> leaving <46>

R3C5 - removing <5> from <456> leaving <46>

Squares R2C5 and R3C5 in column 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 column.

R4C5 - removing <6> from <1689> leaving <189>

R7C5 - removing <6> from <5689> leaving <589>

R7C7 is the only square in row 7 that can be <6>

Intersection of row 3 with block 1. The values <35> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.

R1C3 - removing <3> from <134> leaving <14>

Intersection of row 9 with block 9. The value <1> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C8 - removing <1> from <123> leaving <23>

R7C9 - removing <1> from <1238> leaving <238>

R2C8 is the only square in column 8 that can be <1>

R1C3 is the only square in row 1 that can be <1>

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

R7C2 is the only square in row 7 that can be <1>

R9C7 is the only square in column 7 that can be <1>

R8C7 is the only square in column 7 that can be <5>

R8C2 can only be <9>

R8C5 can only be <8>

R2C2 can only be <6>

R2C5 can only be <4>

R3C2 can only be <5>

R2C3 can only be <9>

R3C5 can only be <6>

R5C3 can only be <8>

R4C1 can only be <9>

R4C5 can only be <1>

R4C9 can only be <3>

R6C5 can only be <2>

R4C4 can only be <6>

R1C9 can only be <4>

R5C7 can only be <4>

R5C8 can only be <2>

R1C7 can only be <3>

R7C8 can only be <3>

R6C9 can only be <1>

R7C1 can only be <8>

R7C3 can only be <5>

R8C8 can only be <4>

R8C3 can only be <3>

R9C9 can only be <8>

R9C1 can only be <4>

R7C9 can only be <2>

R4C6 can only be <8>

R9C4 can only be <5>

R7C5 can only be <9>

R5C5 can only be <5>

R3C3 can only be <4>

R3C1 can only be <3>

R9C6 can only be <6>

R1C4 can only be <9>

R1C6 can only be <5>

R5C4 can only be <3>

R5C6 can only be <9>



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