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Daily Sudoku Answer 



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May 17 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C8 can only be <6>

R9C4 can only be <5>

R9C6 can only be <4>

R5C6 can only be <5>

R8C5 can only be <1>

R1C6 can only be <8>

R7C5 can only be <8>

R9C5 can only be <6>

R2C1 is the only square in row 2 that can be <8>

R4C9 is the only square in row 4 that can be <6>

R5C3 is the only square in row 5 that can be <6>

R5C5 is the only square in row 5 that can be <7>

R5C7 is the only square in row 5 that can be <8>

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

R2C5 is the only square in row 2 that can be <9>

R3C3 is the only square in row 3 that can be <9>

R7C7 is the only square in row 7 that can be <9>

R7C1 is the only square in column 1 that can be <1>

R5C9 is the only square in column 9 that can be <1>

Squares R6C9 and R7C9 in column 9 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.

R3C9 - removing <4> from <2457> leaving <257>

R8C9 - removing <4> from <247> leaving <27>

Intersection of column 7 with block 3. The value <4> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C8 - removing <4> from <147> leaving <17>

Intersection of block 4 with column 1. The values <234> 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 these values.

R3C1 - removing <24> from <2457> leaving <57>

R8C1 - removing <24> from <2457> leaving <57>

R3C7 is the only square in row 3 that can be <4>

Squares R2C2 and R2C9 in row 2 and R8C2 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 2 and 9 can be removed.

R1C2 - removing <2> from <2457> leaving <457>

R3C9 - removing <2> from <257> leaving <57>

R9C2 - removing <2> from <27> leaving <7>

R8C1 can only be <5>

R3C1 can only be <7>

R3C9 can only be <5>

R3C5 can only be <2>

R2C9 can only be <2>

R2C2 can only be <5>

R8C9 can only be <7>

R1C7 can only be <1>

R1C4 can only be <3>

R8C8 can only be <4>

R1C5 can only be <5>

R5C4 can only be <2>

R1C2 can only be <4>

R1C8 can only be <7>

R9C7 can only be <2>

R8C2 can only be <2>

R5C8 can only be <3>

R7C9 can only be <3>

R9C3 can only be <3>

R1C3 can only be <2>

R5C1 can only be <4>

R9C8 can only be <1>

R6C9 can only be <4>

R6C5 can only be <3>

R7C3 can only be <4>

R4C1 can only be <3>

R6C1 can only be <2>

R4C5 can only be <4>



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