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Daily Sudoku Answer 



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Jul 22 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C8 is the only square in row 1 that can be <3>

R1C3 is the only square in row 1 that can be <7>

R6C3 is the only square in row 6 that can be <1>

R6C4 is the only square in row 6 that can be <5>

R5C3 is the only square in column 3 that can be <3>

R3C4 is the only square in column 4 that can be <7>

R3C9 can only be <9>

R3C7 can only be <5>

R3C3 can only be <6>

R8C5 is the only square in column 5 that can be <3>

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

Squares R8C2 and R9C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C2 - removing <19> from <189> leaving <8>

R2C2 - removing <9> from <459> leaving <45>

R4C2 - removing <9> from <4689> leaving <468>

R5C2 - removing <9> from <45689> leaving <4568>

Squares R8C2 and R9C2 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C3 - removing <9> from <29> leaving <2>

Intersection of row 6 with block 6. The values <346> only appears in one or more of squares R6C7, R6C8 and R6C9 of row 6. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain these values.

R4C7 - removing <4> from <2489> leaving <289>

R5C7 - removing <4> from <24789> leaving <2789>

R5C8 - removing <46> from <2467> leaving <27>

R5C9 - removing <6> from <267> leaving <27>

R6C8 is the only square in column 8 that can be <4>

R6C7 can only be <3>

R6C9 can only be <6>

R9C9 is the only square in row 9 that can be <3>

R9C8 is the only square in column 8 that can be <6>

R9C4 can only be <9>

R9C2 can only be <1>

R8C4 can only be <4>

R8C7 can only be <1>

R5C4 can only be <6>

R8C2 can only be <9>

R9C7 can only be <2>

R2C7 can only be <7>

R7C9 can only be <7>

R2C8 can only be <2>

R7C7 can only be <4>

R5C8 can only be <7>

R5C9 can only be <2>

R4C6 is the only square in row 4 that can be <2>

R7C6 can only be <6>

R7C5 can only be <2>

R2C5 is the only square in row 2 that can be <6>

R4C2 is the only square in row 4 that can be <6>

R4C1 is the only square in row 4 that can be <4>

R3C1 can only be <1>

R5C2 can only be <5>

R2C2 can only be <4>

R2C6 can only be <9>

R2C3 can only be <5>

R1C6 can only be <1>

R3C5 can only be <4>

R1C1 can only be <9>

R5C5 can only be <1>

R5C6 can only be <4>

R5C1 can only be <8>

R7C3 can only be <8>

R5C7 can only be <9>

R7C1 can only be <5>

R4C3 can only be <9>

R4C7 can only be <8>



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