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Daily Sudoku Answer 



The full reasoning can be found below the Sudoku.

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Apr 28 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C9 is the only square in row 4 that can be <9>

R7C3 is the only square in row 7 that can be <4>

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

R5C6 is the only square in row 5 that can be <7>

R7C8 is the only square in row 7 that can be <9>

R2C4 is the only square in column 4 that can be <9>

Squares R5C8 and R6C8 in column 8 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.

R2C8 - removing <2> from <235> leaving <35>

R8C8 - removing <12> from <12358> leaving <358>

R8C6 is the only square in row 8 that can be <1>

R9C7 is the only square in row 9 that can be <1>

R9C2 is the only square in row 9 that can be <5>

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

R1C8 can only be <8>

R2C8 can only be <3>

R2C7 is the only square in row 2 that can be <5>

R7C7 is the only square in column 7 that can be <3>

Squares R3C1 and R3C7 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C2 - removing <24> from <249> leaving <9>

R3C3 - removing <2> from <259> leaving <59>

R3C6 - removing <4> from <348> leaving <38>

R3C3 can only be <5>

R1C4 is the only square in row 1 that can be <5>

R5C5 is the only square in row 5 that can be <5>

R8C3 is the only square in row 8 that can be <9>

Squares R1C6 and R2C6 in column 6 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.

R4C6 - removing <46> from <2468> leaving <28>

R9C6 - removing <6> from <2368> leaving <238>

Squares R5C8 and R6C8 in block 6 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 block.

R4C7 - removing <2> from <246> leaving <46>

R5C7 - removing <2> from <246> leaving <46>

R3C7 is the only square in column 7 that can be <2>

R3C1 can only be <4>

R6C4 is the only square in row 6 that can be <4>

R6C5 is the only square in row 6 that can be <3>

R3C5 can only be <8>

R3C6 can only be <3>

R4C5 can only be <6>

R4C7 can only be <4>

R5C7 can only be <6>

R5C2 is the only square in row 5 that can be <4>

R5C4 is the only square in row 5 that can be <8>

R7C4 can only be <2>

R4C6 can only be <2>

R7C9 can only be <8>

R9C6 can only be <8>

R4C2 can only be <8>

R8C2 can only be <2>

R8C9 can only be <6>

R2C2 can only be <6>

R9C1 can only be <3>

R8C4 can only be <3>

R9C9 can only be <2>

R9C4 can only be <6>

R8C1 can only be <8>

R2C6 can only be <4>

R1C3 can only be <1>

R2C9 can only be <7>

R1C6 can only be <6>

R2C1 can only be <2>

R1C9 can only be <4>

R1C1 can only be <7>

R5C3 can only be <2>

R6C1 can only be <1>

R5C8 can only be <1>

R6C3 can only be <6>

R6C8 can only be <2>



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