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Daily Sudoku Answer 



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May 15 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s169006



Reasoning 



R2C2 is the only square in row 2 that can be <6>

R4C5 is the only square in row 4 that can be <2>

R4C4 is the only square in row 4 that can be <7>

R4C2 is the only square in row 4 that can be <9>

R5C7 is the only square in row 5 that can be <2>

R1C9 is the only square in row 1 that can be <2>

R5C4 is the only square in row 5 that can be <8>

R6C4 is the only square in row 6 that can be <9>

R7C1 is the only square in row 7 that can be <7>

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

R8C2 is the only square in row 8 that can be <2>

R9C8 is the only square in row 9 that can be <7>

R9C7 is the only square in row 9 that can be <3>

R9C2 is the only square in column 2 that can be <8>

R9C3 is the only square in column 3 that can be <6>

Squares R6C2 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C5 - removing <1> from <156> leaving <56>

R6C6 - removing <14> from <1456> leaving <56>

Squares R8C1 and R9C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C1 - removing <14> from <1459> leaving <59>

R2C1 - removing <1> from <1589> leaving <589>

R3C1 - removing <14> from <1458> leaving <58>

Squares R4C8 and R6C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C8 - removing <14> from <1345> leaving <35>

R2C8 - removing <1> from <1358> leaving <358>

R8C8 - removing <14> from <148> leaving <8>

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.

R3C9 - removing <4> from <148> leaving <18>

Squares R2C4<13>, R2C6<135> and R2C8<35> in row 2 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <135>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <5> from <589> leaving <89>

R2C9 - removing <1> from <189> leaving <89>

Intersection of row 2 with block 2. The value <1> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R3C5 - removing <1> from <135> leaving <35>

Squares R9C1, R9C9, R8C1 and R8C9 form a Type-1 Unique Rectangle on <14>.

R8C9 - removing <14> from <146> leaving <6>

R7C5 is the only square in row 7 that can be <6>

R6C5 can only be <5>

R6C6 can only be <6>

R3C5 can only be <3>

R5C5 can only be <1>

R2C4 can only be <1>

R5C3 can only be <4>

R4C6 can only be <4>

R2C6 can only be <5>

R8C4 can only be <3>

R2C8 can only be <3>

R1C8 can only be <5>

R4C8 can only be <1>

R5C6 can only be <3>

R6C8 can only be <4>

R3C3 can only be <1>

R6C2 can only be <1>

R8C6 can only be <1>

R1C2 can only be <4>

R8C1 can only be <4>

R1C1 can only be <9>

R3C7 can only be <4>

R3C9 can only be <8>

R1C3 can only be <3>

R3C1 can only be <5>

R2C9 can only be <9>

R9C1 can only be <1>

R9C9 can only be <4>

R1C7 can only be <1>

R2C1 can only be <8>

R7C7 can only be <9>

R7C9 can only be <1>



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