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Daily Sudoku Answer 



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Oct 27 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C9 can only be <3>

R6C6 can only be <8>

R9C5 can only be <9>

R9C9 can only be <5>

R1C1 can only be <4>

R5C6 can only be <2>

R9C1 can only be <7>

R1C5 can only be <7>

R4C6 can only be <7>

R6C7 is the only square in column 7 that can be <1>

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

R4C7 is the only square in column 7 that can be <3>

R4C4 can only be <9>

R4C8 is the only square in row 4 that can be <2>

R5C9 is the only square in column 9 that can be <8>

Squares R2C5 and R3C5 in column 5 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.

R6C5 - removing <34> from <3456> leaving <56>

Squares R5C8 and R6C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C8 - removing <9> from <149> leaving <14>

Intersection of column 1 with block 7. The value <6> 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 this value.

R8C2 - removing <6> from <468> leaving <48>

Intersection of column 2 with block 4. The values <56> only appears in one or more of squares R4C2, R5C2 and R6C2 of column 2. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.

R4C3 - removing <5> from <58> leaving <8>

R5C1 - removing <5> from <359> leaving <39>

R6C3 - removing <5> from <459> leaving <49>

Squares R4C2, R4C5, R6C2 and R6C5 form a Type-1 Unique Rectangle on <56>.

R6C2 - removing <56> from <3456> leaving <34>

R6C5 is the only square in row 6 that can be <6>

R4C5 can only be <5>

R4C2 can only be <6>

R6C8 is the only square in row 6 that can be <5>

R5C8 can only be <9>

R5C1 can only be <3>

R5C4 can only be <4>

R6C2 can only be <4>

R5C2 can only be <5>

R6C4 can only be <3>

R6C3 can only be <9>

R8C2 can only be <8>

R3C3 can only be <5>

R8C1 can only be <6>

R8C5 can only be <2>

R2C2 can only be <3>

R7C5 can only be <8>

R2C5 can only be <4>

R2C8 can only be <1>

R3C5 can only be <3>

R2C9 can only be <9>

R8C8 can only be <4>

R2C1 can only be <8>

R3C9 can only be <2>

R3C1 can only be <9>

R7C3 can only be <4>

R3C7 can only be <4>

R7C9 can only be <6>

R7C7 can only be <2>

R7C1 can only be <5>

R8C9 can only be <1>



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