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Daily Sudoku Answer 



The full reasoning can be found below the Sudoku.

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Nov 24 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R3C4 can only be <9>

R5C5 can only be <8>

R7C4 can only be <2>

R9C4 can only be <7>

R9C6 can only be <4>

R1C4 can only be <8>

R9C8 can only be <1>

R9C9 can only be <9>

R3C6 can only be <6>

R7C5 can only be <6>

R9C1 can only be <8>

R9C2 can only be <2>

R3C5 can only be <4>

R1C6 can only be <7>

R7C6 can only be <3>

R7C8 can only be <4>

R8C5 can only be <9>

R7C2 can only be <1>

R2C5 can only be <2>

R1C1 is the only square in row 1 that can be <1>

R4C3 is the only square in row 4 that can be <1>

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

R2C8 is the only square in row 2 that can be <8>

R6C3 is the only square in row 6 that can be <9>

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

R8C7 is the only square in row 8 that can be <2>

R2C1 is the only square in column 1 that can be <6>

R5C2 is the only square in column 2 that can be <7>

R5C7 can only be <6>

R8C8 is the only square in column 8 that can be <7>

R8C9 can only be <6>

R1C8 is the only square in row 1 that can be <6>

Squares R1C9 and R4C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C9 - removing <4> from <347> leaving <37>

R6C9 - removing <4> from <347> leaving <37>

Intersection of block 1 with column 2. The value <5> only appears in one or more of squares R1C2, R2C2 and R3C2 of block 1. These squares are the ones that intersect with column 2. Thus, the other (non-intersecting) squares of column 2 cannot contain this value.

R8C2 - removing <5> from <345> leaving <34>

Intersection of block 4 with column 1. The value <4> only appears in one or more of squares R4C1, R5C1 and R6C1 of block 4. These squares are the ones that intersect with column 1. Thus, the other (non-intersecting) squares of column 1 cannot contain this value.

R8C1 - removing <4> from <345> leaving <35>

Squares R3C2 and R5C3 form a remote naked pair. <35> can be removed from any square that is common to their groups.

R2C3 - removing <3> from <34> leaving <4>

R2C7 can only be <7>

R1C2 can only be <5>

R2C9 can only be <3>

R6C7 can only be <4>

R6C9 can only be <7>

R3C8 can only be <5>

R3C2 can only be <3>

R5C8 can only be <3>

R1C9 can only be <4>

R5C3 can only be <5>

R6C1 can only be <3>

R4C9 can only be <5>

R8C2 can only be <4>

R4C1 can only be <4>

R8C3 can only be <3>

R8C1 can only be <5>



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