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Daily Sudoku Answer 



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Jul 05 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C3 is the only square in row 2 that can be <8>

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

R1C4 is the only square in row 1 that can be <9>

R4C7 is the only square in row 4 that can be <8>

R8C3 is the only square in row 8 that can be <6>

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

R6C1 is the only square in row 6 that can be <9>

R5C8 is the only square in row 5 that can be <9>

R3C4 is the only square in column 4 that can be <3>

R7C4 is the only square in column 4 that can be <6>

R8C8 is the only square in column 8 that can be <3>

R6C7 is the only square in column 7 that can be <3>

Squares R7C2 and R8C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C2 - removing <4> from <124> leaving <12>

R5C2 - removing <47> from <1247> leaving <12>

R5C1 is the only square in block 4 that can be <7>

Squares R6C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C3 - removing <14> from <1234> leaving <23>

R4C3 - removing <14> from <1234> leaving <23>

Squares R7C2 and R8C2 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C1 - removing <4> from <458> leaving <58>

R9C1 - removing <4> from <1458> leaving <158>

R9C3 - removing <4> from <14> leaving <1>

R6C3 can only be <4>

Intersection of column 5 with block 8. The value <5> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R9C4 - removing <5> from <457> leaving <47>

Intersection of column 7 with block 9. The value <5> only appears in one or more of squares R7C7, R8C7 and R9C7 of column 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C8 - removing <5> from <45> leaving <4>

R7C9 - removing <5> from <2457> leaving <247>

R7C2 can only be <7>

R2C8 can only be <1>

R3C8 can only be <5>

R7C9 can only be <2>

R8C2 can only be <4>

R7C6 can only be <8>

R7C1 can only be <5>

R9C1 can only be <8>

R3C2 is the only square in row 3 that can be <2>

R5C2 can only be <1>

R1C3 can only be <3>

R5C9 can only be <4>

R4C1 can only be <3>

R5C5 can only be <2>

R3C9 can only be <6>

R4C3 can only be <2>

R1C9 can only be <7>

R2C7 can only be <4>

R2C5 can only be <7>

R1C7 can only be <2>

R8C5 can only be <5>

R8C7 can only be <7>

R9C5 can only be <4>

R9C7 can only be <5>

R9C4 can only be <7>

R1C5 can only be <1>

R1C1 can only be <4>

R3C6 can only be <4>

R3C1 can only be <1>

R1C6 can only be <6>

R4C6 can only be <1>

R4C9 can only be <5>

R6C6 can only be <7>

R4C4 can only be <4>

R6C9 can only be <1>

R6C4 can only be <5>

R9C6 can only be <2>



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