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Daily Sudoku Answer 



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Jun 25 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C6 can only be <4>

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

R2C9 is the only square in row 2 that can be <7>

R1C5 is the only square in row 1 that can be <7>

R1C6 is the only square in row 1 that can be <9>

R3C6 can only be <5>

R6C6 can only be <2>

R4C6 can only be <1>

R4C5 can only be <8>

R6C5 can only be <9>

R5C5 can only be <5>

R1C9 is the only square in row 1 that can be <5>

R3C7 is the only square in row 3 that can be <9>

R5C2 is the only square in row 5 that can be <9>

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

R4C4 can only be <6>

R4C1 is the only square in row 4 that can be <7>

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

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

R6C9 is the only square in row 6 that can be <8>

R9C2 is the only square in row 9 that can be <6>

R8C2 is the only square in column 2 that can be <8>

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

Squares R5C8 and R5C9 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C7 - removing <2> from <234> leaving <34>

Squares R4C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C7 - removing <3> from <123> leaving <12>

R9C7 - removing <4> from <124> leaving <12>

Intersection of column 1 with block 7. The values <45> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R7C3 - removing <4> from <1249> leaving <129>

R8C3 - removing <4> from <12349> leaving <1239>

Squares R6C3, R6C7, R4C3 and R4C7 form a Type-1 Unique Rectangle on <34>.

R4C3 - removing <34> from <234> leaving <2>

R4C2 can only be <3>

R4C7 can only be <4>

R6C3 can only be <4>

R6C7 can only be <3>

R2C8 is the only square in row 2 that can be <3>

Squares R7C2 and R9C7 form a remote naked pair. <12> can be removed from any square that is common to their groups.

R9C1 - removing <2> from <245> leaving <45>

R7C9 - removing <12> from <124> leaving <4>

R3C9 can only be <2>

R3C1 can only be <8>

R5C9 can only be <1>

R2C7 can only be <1>

R5C8 can only be <2>

R2C2 can only be <2>

R9C7 can only be <2>

R1C8 can only be <8>

R3C8 can only be <4>

R1C1 can only be <3>

R8C8 can only be <1>

R8C4 can only be <9>

R9C5 can only be <4>

R1C3 can only be <1>

R7C3 can only be <9>

R7C2 can only be <1>

R7C4 can only be <5>

R8C3 can only be <3>

R7C1 can only be <2>

R9C4 can only be <1>

R9C1 can only be <5>

R8C5 can only be <2>

R8C1 can only be <4>



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