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Daily Sudoku Answer 



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Mar 29 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C9 can only be <8>

R3C7 is the only square in row 3 that can be <1>

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

R8C3 is the only square in row 8 that can be <2>

Squares R1C5<59>, R6C5<359> and R9C5<39> in column 5 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <359>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C5 - removing <9> from <269> leaving <26>

R5C5 - removing <3> from <1236> leaving <126>

Squares R4C5<126>, R4C6<26> and R5C5<126> in block 5 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <126>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C4 - removing <2> from <248> leaving <48>

R5C4 - removing <2> from <248> leaving <48>

R5C6 - removing <26> from <2367> leaving <37>

Squares R4C4 and R5C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C4 - removing <8> from <589> leaving <59>

Squares R1C3 and R1C7 in row 1 and R6C3 and R6C7 in row 6 form a Simple X-Wing pattern on possibility <8>. All other instances of this possibility in columns 3 and 7 can be removed.

R3C3 - removing <8> from <34568> leaving <3456>

R4C3 - removing <8> from <168> leaving <16>

R4C7 - removing <8> from <248> leaving <24>

R4C4 is the only square in row 4 that can be <8>

R5C4 can only be <4>

R5C9 can only be <2>

R3C9 can only be <4>

R4C7 can only be <4>

R8C7 can only be <6>

R8C2 can only be <5>

R8C8 can only be <4>

R2C3 is the only square in row 2 that can be <4>

R7C8 is the only square in row 7 that can be <5>

R2C7 is the only square in column 7 that can be <2>

R2C5 can only be <6>

R2C2 can only be <9>

R5C5 can only be <1>

R5C1 can only be <6>

R4C5 can only be <2>

R2C8 can only be <3>

R5C8 can only be <8>

R4C6 can only be <6>

R4C3 can only be <1>

R3C1 can only be <3>

R5C2 can only be <7>

R3C8 can only be <9>

R6C7 can only be <3>

R7C1 can only be <1>

R3C6 can only be <2>

R1C7 can only be <8>

R5C6 can only be <3>

R7C2 can only be <6>

R6C3 can only be <8>

R1C3 can only be <5>

R3C2 can only be <8>

R1C5 can only be <9>

R3C3 can only be <6>

R6C5 can only be <5>

R9C5 can only be <3>

R3C4 can only be <5>

R7C6 can only be <9>

R6C4 can only be <9>

R7C4 can only be <2>

R7C7 can only be <7>

R6C6 can only be <7>

R7C3 can only be <3>

R9C7 can only be <9>

R9C3 can only be <7>



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