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Daily Sudoku Answer 



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The full reasoning can be found below the Sudoku.

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Jun 10 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C6 is the only square in row 8 that can be <1>

R5C5 is the only square in row 5 that can be <1>

R7C3 is the only square in row 7 that can be <1>

R8C4 is the only square in row 8 that can be <9>

R4C6 is the only square in row 4 that can be <9>

R9C7 is the only square in row 9 that can be <7>

R5C8 is the only square in column 8 that can be <5>

Squares R6C3 and R6C5 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C4 - removing <5> from <2345> leaving <234>

R6C6 - removing <56> from <23456> leaving <234>

Intersection of row 3 with block 3. The value <3> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <3> from <369> leaving <69>

R1C9 - removing <3> from <349> leaving <49>

Intersection of block 4 with row 5. The value <3> only appears in one or more of squares R5C1, R5C2 and R5C3 of block 4. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.

R5C4 - removing <3> from <2378> leaving <278>

R5C6 - removing <3> from <236> leaving <26>

R5C9 - removing <3> from <238> leaving <28>

Intersection of block 8 with row 9. The value <2> only appears in one or more of squares R9C4, R9C5 and R9C6 of block 8. These squares are the ones that intersect with row 9. Thus, the other (non-intersecting) squares of row 9 cannot contain this value.

R9C3 - removing <2> from <2456> leaving <456>

R9C9 - removing <2> from <248> leaving <48>

R3C3 is the only square in column 3 that can be <2>

R2C8 is the only square in row 2 that can be <2>

R8C8 can only be <3>

R8C2 can only be <2>

R7C8 can only be <4>

R3C8 can only be <7>

R9C9 can only be <8>

R5C9 can only be <2>

R5C6 can only be <6>

R7C9 can only be <9>

R6C7 can only be <3>

R4C7 can only be <8>

R7C7 can only be <2>

R1C9 can only be <4>

R3C9 can only be <3>

R5C1 can only be <3>

R2C6 can only be <4>

R6C5 can only be <5>

R6C3 can only be <6>

R3C5 can only be <6>

R4C5 can only be <7>

R7C5 can only be <8>

R2C4 can only be <7>

R6C6 can only be <2>

R3C2 can only be <5>

R3C7 can only be <9>

R1C7 can only be <6>

R4C3 can only be <5>

R4C4 can only be <3>

R5C4 can only be <8>

R5C2 can only be <7>

R7C1 can only be <5>

R2C2 can only be <6>

R6C4 can only be <4>

R9C6 can only be <5>

R7C2 can only be <3>

R3C1 can only be <4>

R9C3 can only be <4>

R9C1 can only be <6>

R9C4 can only be <2>

R1C6 can only be <3>

R1C1 can only be <9>

R1C4 can only be <5>

R1C3 can only be <7>



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