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Daily Sudoku Answer 



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Oct 28 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C1 is the only square in row 2 that can be <1>

R8C4 is the only square in row 8 that can be <1>

R4C5 is the only square in row 4 that can be <1>

R4C6 is the only square in row 4 that can be <8>

R2C9 is the only square in row 2 that can be <8>

R1C5 is the only square in row 1 that can be <8>

R5C7 is the only square in row 5 that can be <1>

R8C8 is the only square in row 8 that can be <6>

R8C9 is the only square in row 8 that can be <7>

R1C4 is the only square in row 1 that can be <7>

R1C7 is the only square in row 1 that can be <6>

R3C7 can only be <2>

R2C7 can only be <9>

R9C7 can only be <3>

R7C7 can only be <5>

R2C2 can only be <4>

R1C9 can only be <4>

R7C9 can only be <2>

R2C8 can only be <7>

R2C6 can only be <2>

R3C3 can only be <5>

R3C1 can only be <7>

R9C8 can only be <4>

R9C1 can only be <9>

R9C6 can only be <6>

R9C5 can only be <2>

R9C3 can only be <8>

R7C3 is the only square in row 7 that can be <3>

R1C3 can only be <9>

R1C2 can only be <3>

Intersection of row 4 with block 4. The value <5> only appears in one or more of squares R4C1, R4C2 and R4C3 of row 4. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R5C1 - removing <5> from <345> leaving <34>

R6C2 - removing <5> from <259> leaving <29>

Intersection of row 6 with block 5. The values <46> only appears in one or more of squares R6C4, R6C5 and R6C6 of row 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.

R5C4 - removing <4> from <249> leaving <29>

R5C5 - removing <4> from <347> leaving <37>

R5C6 - removing <4> from <457> leaving <57>

Squares R4C4 and R5C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C4 - removing <29> from <2469> leaving <46>

Squares R3C4, R3C5, R6C4 and R6C5 form a Type-1 Unique Rectangle on <46>.

R6C5 - removing <46> from <346> leaving <3>

R6C8 can only be <2>

R5C5 can only be <7>

R6C2 can only be <9>

R4C8 can only be <3>

R4C1 can only be <5>

R5C6 can only be <5>

R7C5 can only be <4>

R5C9 can only be <9>

R6C6 can only be <4>

R5C4 can only be <2>

R6C9 can only be <5>

R6C4 can only be <6>

R7C6 can only be <7>

R3C5 can only be <6>

R3C4 can only be <4>

R4C2 can only be <2>

R8C1 can only be <4>

R4C4 can only be <9>

R8C2 can only be <5>

R5C3 can only be <4>

R5C1 can only be <3>

R8C3 can only be <2>



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