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Daily Sudoku Answer 



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May 05 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C5 is the only square in row 5 that can be <9>

R8C5 can only be <4>

R8C6 can only be <8>

R2C5 can only be <7>

R8C8 can only be <2>

R8C9 can only be <5>

R8C1 can only be <9>

R2C2 can only be <6>

R1C9 is the only square in row 1 that can be <9>

R3C3 is the only square in row 3 that can be <9>

R5C1 is the only square in row 5 that can be <6>

R7C4 is the only square in row 7 that can be <9>

R9C2 is the only square in column 2 that can be <4>

R9C1 is the only square in row 9 that can be <2>

R6C2 is the only square in column 2 that can be <2>

R3C2 is the only square in column 2 that can be <5>

R9C4 is the only square in column 4 that can be <5>

Squares R7C6 and R9C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C6 - removing <1> from <126> leaving <26>

R3C6 - removing <1> from <1246> leaving <246>

R4C6 - removing <7> from <367> leaving <36>

R6C6 - removing <7> from <347> leaving <34>

Intersection of row 5 with block 6. The value <4> only appears in one or more of squares R5C7, R5C8 and R5C9 of row 5. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R6C7 - removing <4> from <345> leaving <35>

Intersection of row 6 with block 4. The value <8> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R5C2 - removing <8> from <78> leaving <7>

R5C3 - removing <8> from <1378> leaving <137>

R1C2 can only be <8>

R3C1 can only be <1>

R2C1 can only be <3>

R1C1 can only be <7>

R3C4 is the only square in row 3 that can be <8>

R6C4 is the only square in row 6 that can be <7>

R4C4 can only be <6>

R4C6 can only be <3>

R1C4 can only be <1>

R4C8 can only be <1>

R6C6 can only be <4>

R4C3 can only be <5>

R2C4 can only be <4>

R2C9 can only be <1>

R4C7 can only be <2>

R6C1 can only be <8>

R4C9 can only be <7>

R6C3 can only be <3>

R7C1 can only be <5>

R6C7 can only be <5>

R5C3 can only be <1>

R1C6 is the only square in row 1 that can be <2>

R3C6 can only be <6>

R3C7 can only be <4>

R3C9 can only be <2>

R5C7 can only be <3>

R1C7 can only be <6>

R1C8 can only be <3>

R7C7 can only be <1>

R9C8 can only be <8>

R7C6 can only be <7>

R9C3 can only be <7>

R9C9 can only be <3>

R5C8 can only be <4>

R7C9 can only be <4>

R5C9 can only be <8>

R7C8 can only be <6>

R7C3 can only be <8>

R9C6 can only be <1>



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