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Daily Sudoku Answer 



The full reasoning can be found below the Sudoku.

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Jun 09 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C7 can only be <5>

R8C1 can only be <5>

R1C4 is the only square in row 1 that can be <2>

R6C5 is the only square in row 6 that can be <4>

R6C8 is the only square in row 6 that can be <8>

R9C1 is the only square in column 1 that can be <9>

R4C5 is the only square in column 5 that can be <2>

R4C3 can only be <1>

R4C2 is the only square in row 4 that can be <9>

R5C2 is the only square in block 4 that can be <6>

R5C3 is the only square in row 5 that can be <5>

R5C8 is the only square in row 5 that can be <3>

R5C7 is the only square in row 5 that can be <1>

Squares R1C1 and R2C1 in block 1 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 block.

R1C2 - removing <3> from <13458> leaving <1458>

R1C3 - removing <3> from <38> leaving <8>

R2C2 - removing <3> from <135> leaving <15>

R3C2 - removing <3> from <134> leaving <14>

Intersection of row 3 with block 2. The value <3> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R2C5 - removing <3> from <356> leaving <56>

Squares R8C8<167>, R8C9<167> and R9C9<67> in block 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <167>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C8 - removing <7> from <2457> leaving <245>

R9C7 - removing <67> from <467> leaving <4>

R9C8 - removing <67> from <24567> leaving <245>

R1C7 can only be <6>

R1C1 can only be <3>

R4C7 can only be <7>

R4C8 can only be <6>

R1C9 can only be <1>

R2C1 can only be <6>

R2C8 can only be <7>

R2C5 can only be <5>

R2C2 can only be <1>

R7C5 can only be <3>

R1C6 can only be <9>

R2C9 can only be <3>

R8C8 can only be <1>

R7C4 can only be <7>

R1C8 can only be <4>

R3C6 can only be <1>

R5C6 can only be <7>

R3C5 can only be <6>

R1C2 can only be <5>

R3C8 can only be <9>

R3C2 can only be <4>

R3C4 can only be <3>

R8C5 can only be <8>

R5C4 can only be <8>

R9C6 can only be <5>

R7C2 can only be <2>

R8C2 can only be <7>

R5C5 can only be <9>

R9C4 can only be <6>

R9C9 can only be <7>

R9C8 can only be <2>

R7C6 can only be <4>

R9C3 can only be <3>

R7C8 can only be <5>

R8C9 can only be <6>

R6C2 can only be <3>

R9C2 can only be <8>

R6C3 can only be <2>



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