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Daily Sudoku Answer 



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Feb 20 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C5 can only be <8>

R5C9 can only be <1>

R5C1 can only be <9>

R6C7 can only be <7>

R2C2 is the only square in row 2 that can be <9>

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

R3C9 is the only square in row 3 that can be <9>

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

R7C6 is the only square in row 7 that can be <9>

R8C9 is the only square in row 8 that can be <3>

R4C7 is the only square in row 4 that can be <3>

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

R7C1 is the only square in row 7 that can be <3>

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

R9C1 is the only square in column 1 that can be <4>

R3C4 is the only square in block 2 that can be <4>

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

Squares R6C8 and R6C9 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C1 - removing <8> from <1568> leaving <156>

R6C3 - removing <8> from <168> leaving <16>

Squares R6C6 and R8C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C6 - removing <56> from <2567> leaving <27>

R3C6 - removing <56> from <2567> leaving <27>

Squares R1C6 and R3C6 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C4 - removing <2> from <256> leaving <56>

R2C1 is the only square in row 2 that can be <2>

R2C7 is the only square in row 2 that can be <1>

R7C7 can only be <4>

R7C5 can only be <6>

R1C7 can only be <5>

R8C8 can only be <6>

R8C6 can only be <5>

R3C8 can only be <2>

R7C9 can only be <8>

R3C6 can only be <7>

R1C8 can only be <4>

R6C8 can only be <8>

R1C9 can only be <6>

R6C9 can only be <2>

R9C8 can only be <1>

R2C5 can only be <5>

R7C2 can only be <2>

R8C5 can only be <4>

R6C6 can only be <6>

R9C4 can only be <2>

R1C1 can only be <8>

R2C4 can only be <6>

R1C6 can only be <2>

R6C3 can only be <1>

R4C4 can only be <5>

R7C4 can only be <1>

R1C2 can only be <7>

R4C1 can only be <6>

R6C1 can only be <5>

R3C3 can only be <6>

R3C2 can only be <5>

R9C3 can only be <8>

R4C2 can only be <8>

R4C3 can only be <7>

R9C2 can only be <6>

R3C1 can only be <1>



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