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Daily Sudoku Answer 



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Oct 24 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R3C1 is the only square in row 3 that can be <9>

R7C9 is the only square in row 7 that can be <9>

R7C5 is the only square in row 7 that can be <7>

R7C6 is the only square in row 7 that can be <8>

R6C2 is the only square in row 6 that can be <8>

R8C8 is the only square in row 8 that can be <5>

R9C4 is the only square in row 9 that can be <5>

R4C1 is the only square in column 1 that can be <6>

R4C9 can only be <2>

R6C9 can only be <4>

R8C9 can only be <6>

R9C9 can only be <7>

R6C6 is the only square in row 6 that can be <2>

R7C2 is the only square in row 7 that can be <6>

R9C6 is the only square in row 9 that can be <6>

R1C6 is the only square in column 6 that can be <3>

R4C4 is the only square in column 4 that can be <3>

R4C8 is the only square in row 4 that can be <8>

Squares R8C5 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C2 - removing <1> from <123> leaving <23>

R8C3 - removing <14> from <1234> leaving <23>

Squares R8C2 and R8C3 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R9C3 - removing <2> from <124> leaving <14>

Squares R7C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C3 - removing <14> from <12457> leaving <257>

R4C3 - removing <1> from <15> leaving <5>

R5C3 - removing <1> from <1579> leaving <579>

R6C3 - removing <1> from <139> leaving <39>

R4C7 can only be <1>

R6C7 can only be <9>

R5C8 can only be <6>

R6C3 can only be <3>

R5C7 can only be <5>

R6C1 can only be <1>

R8C3 can only be <2>

R8C2 can only be <3>

R1C3 can only be <7>

R5C3 can only be <9>

R1C1 can only be <4>

R5C2 can only be <7>

R3C2 can only be <2>

R1C4 can only be <1>

R1C7 can only be <2>

R2C1 can only be <3>

R1C2 can only be <5>

R9C7 can only be <4>

R2C8 can only be <4>

R2C7 can only be <7>

R3C8 can only be <3>

R7C8 can only be <1>

R3C5 can only be <4>

R2C2 can only be <1>

R3C4 can only be <7>

R8C5 can only be <1>

R7C3 can only be <4>

R9C8 can only be <2>

R8C6 can only be <4>

R5C5 can only be <8>

R5C6 can only be <1>

R9C3 can only be <1>

R2C4 can only be <8>

R3C7 can only be <6>

R5C4 can only be <4>

R2C5 can only be <2>



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