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Daily Sudoku Answer 



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Aug 08 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C5 can only be <2>

R2C5 can only be <8>

R7C6 can only be <5>

R3C7 is the only square in row 3 that can be <5>

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

R4C3 is the only square in row 4 that can be <5>

R5C4 is the only square in row 5 that can be <4>

R3C4 can only be <2>

R3C6 can only be <1>

R1C5 can only be <4>

R3C9 is the only square in row 3 that can be <4>

R5C6 is the only square in row 5 that can be <9>

R6C5 is the only square in row 6 that can be <1>

R6C4 is the only square in row 6 that can be <8>

R1C7 is the only square in column 7 that can be <9>

Squares R4C4 and R4C5 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C7 - removing <36> from <2367> leaving <27>

Squares R7C2<28>, R9C1<289> and R9C3<29> in block 7 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <289>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C1 - removing <28> from <1278> leaving <17>

R7C3 - removing <2> from <1247> leaving <147>

Squares R1C1<12>, R5C1<27> and R7C1<17> in column 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <127>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R9C1 - removing <2> from <289> leaving <89>

Squares R5C2 and R7C2 in column 2 and R5C8 and R7C8 in column 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 5 and 7 can be removed.

R5C1 - removing <2> from <27> leaving <7>

R7C7 - removing <2> from <234678> leaving <34678>

R5C9 - removing <2> from <2367> leaving <367>

R7C9 - removing <2> from <2367> leaving <367>

R7C1 can only be <1>

R1C1 can only be <2>

R1C9 can only be <6>

R2C3 can only be <3>

R1C3 can only be <1>

R5C9 can only be <3>

R3C8 can only be <3>

R2C7 can only be <2>

R4C7 can only be <7>

R4C6 can only be <2>

R6C7 can only be <6>

R8C7 can only be <4>

R7C9 can only be <7>

R9C9 can only be <2>

R6C3 can only be <2>

R5C8 can only be <2>

R7C3 can only be <4>

R8C3 can only be <7>

R9C3 can only be <9>

R7C8 can only be <6>

R6C6 can only be <7>

R5C2 can only be <6>

R7C4 can only be <3>

R9C1 can only be <8>

R3C3 can only be <6>

R3C2 can only be <8>

R7C7 can only be <8>

R4C4 can only be <6>

R9C5 can only be <6>

R7C2 can only be <2>

R9C7 can only be <3>

R3C1 can only be <9>

R4C5 can only be <3>



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