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Daily Sudoku Answer 



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Mar 16 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s341256



Reasoning 



R8C8 can only be <5>

R3C9 is the only square in row 3 that can be <5>

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

R8C7 can only be <1>

R8C3 can only be <9>

R8C2 can only be <3>

R4C6 is the only square in row 4 that can be <5>

R4C5 is the only square in row 4 that can be <8>

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

R6C4 is the only square in row 6 that can be <3>

R7C3 is the only square in row 7 that can be <5>

R9C9 is the only square in row 9 that can be <3>

Intersection of row 3 with block 1. The values <48> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.

R1C1 - removing <8> from <178> leaving <17>

R1C3 - removing <8> from <1278> leaving <127>

Intersection of block 4 with column 3. The value <1> only appears in one or more of squares R4C3, R5C3 and R6C3 of block 4. These squares are the ones that intersect with column 3. Thus, the other (non-intersecting) squares of column 3 cannot contain this value.

R1C3 - removing <1> from <127> leaving <27>

R3C3 - removing <1> from <12468> leaving <2468>

Squares R1C1<17>, R2C2<79> and R3C2<19> in block 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <179>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C3 - removing <7> from <27> leaving <2>

R2C3 - removing <7> from <267> leaving <26>

R3C1 - removing <1> from <1468> leaving <468>

R2C3 can only be <6>

R3C8 is the only square in row 3 that can be <6>

R6C6 is the only square in row 6 that can be <6>

R5C1 is the only square in row 5 that can be <6>

R7C7 is the only square in row 7 that can be <6>

Squares R4C3 and R6C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R9C3 - removing <7> from <478> leaving <48>

Squares R6C5 and R6C7 in row 6 and R9C5 and R9C7 in row 9 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 5 and 7 can be removed.

R2C7 - removing <2> from <279> leaving <79>

R5C5 - removing <2> from <249> leaving <49>

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

R7C8 can only be <7>

R7C2 can only be <1>

R3C2 can only be <9>

R3C6 can only be <2>

R2C2 can only be <7>

R3C4 can only be <1>

R2C7 can only be <9>

R1C1 can only be <1>

R4C4 can only be <7>

R1C5 can only be <9>

R4C3 can only be <1>

R5C5 can only be <4>

R6C3 can only be <7>

R5C6 can only be <9>

R9C5 can only be <2>

R5C4 can only be <2>

R7C6 can only be <4>

R6C7 can only be <2>

R6C5 can only be <1>

R9C7 can only be <8>

R5C9 can only be <7>

R7C1 can only be <8>

R7C4 can only be <9>

R9C3 can only be <4>

R1C7 can only be <7>

R7C9 can only be <2>

R1C9 can only be <8>

R3C1 can only be <4>

R9C1 can only be <7>

R3C3 can only be <8>



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