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Daily Sudoku Answer 



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Mar 17 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



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

R2C9 is the only square in row 2 that can be <1>

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

R1C6 is the only square in row 1 that can be <4>

R8C5 is the only square in row 8 that can be <7>

R2C1 is the only square in row 2 that can be <7>

R8C9 is the only square in row 8 that can be <9>

R9C4 is the only square in row 9 that can be <9>

R8C7 is the only square in column 7 that can be <5>

R8C1 can only be <4>

R8C3 can only be <8>

R9C8 is the only square in row 9 that can be <4>

Intersection of column 2 with block 7. The value <5> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R9C1 - removing <5> from <235> leaving <23>

Intersection of block 5 with column 5. The values <59> only appears in one or more of squares R4C5, R5C5 and R6C5 of block 5. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain these values.

R3C5 - removing <5> from <358> leaving <38>

R7C5 - removing <5> from <4568> leaving <468>

Squares R2C5 and R3C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R7C5 - removing <8> from <468> leaving <46>

Squares R2C5 and R3C5 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R3C6 - removing <8> from <578> leaving <57>

Squares R6C3<46>, R6C7<48> and R6C9<68> in row 6 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <468>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C5 - removing <46> from <4569> leaving <59>

Squares R3C2 and R3C8 in row 3 and R7C2 and R7C8 in row 7 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 2 and 8 can be removed.

R5C2 - removing <2> from <239> leaving <39>

R5C8 - removing <2> from <236> leaving <36>

R9C2 - removing <2> from <235> leaving <35>

R5C3 is the only square in row 5 that can be <2>

R2C3 can only be <3>

R2C5 can only be <8>

R1C1 can only be <9>

R2C7 can only be <2>

R3C5 can only be <3>

R4C7 can only be <4>

R3C8 can only be <8>

R3C2 can only be <2>

R7C8 can only be <2>

R4C3 can only be <6>

R6C7 can only be <8>

R6C9 can only be <6>

R6C3 can only be <4>

R1C9 can only be <3>

R5C8 can only be <3>

R7C2 can only be <5>

R9C9 can only be <8>

R9C6 can only be <5>

R1C2 can only be <8>

R6C1 can only be <5>

R1C8 can only be <6>

R4C9 can only be <2>

R4C5 can only be <5>

R4C1 can only be <3>

R6C5 can only be <9>

R5C2 can only be <9>

R7C4 can only be <4>

R9C2 can only be <3>

R7C5 can only be <6>

R5C4 can only be <7>

R7C6 can only be <8>

R5C5 can only be <4>

R9C1 can only be <2>

R3C6 can only be <7>

R3C4 can only be <5>

R5C6 can only be <6>



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