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Daily Sudoku Answer 



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Mar 13 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s193287



Reasoning 



R1C7 can only be <7>

R3C5 can only be <1>

R7C5 can only be <4>

R4C5 can only be <6>

R6C5 can only be <8>

R5C5 can only be <7>

R1C2 is the only square in row 1 that can be <5>

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

R1C3 can only be <9>

R1C8 can only be <6>

R3C8 is the only square in row 3 that can be <9>

R7C1 is the only square in row 7 that can be <9>

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

R9C8 is the only square in row 9 that can be <5>

R6C8 is the only square in column 8 that can be <2>

R8C8 is the only square in column 8 that can be <7>

Squares R8C4 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C7 - removing <3> from <1348> leaving <148>

R8C9 - removing <3> from <1346> leaving <146>

Squares R4C2 and R6C2 in column 2 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.

R2C2 - removing <4> from <34678> leaving <3678>

R3C2 - removing <4> from <348> leaving <38>

R9C2 - removing <14> from <147> leaving <7>

R2C3 is the only square in row 2 that can be <7>

Squares R8C3 and R9C3 in block 7 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 block.

R8C1 - removing <4> from <468> leaving <68>

Intersection of row 3 with block 1. The value <8> 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 this value.

R2C1 - removing <8> from <468> leaving <46>

R2C2 - removing <8> from <368> leaving <36>

Squares R9C3, R9C7, R8C3 and R8C7 form a Type-1 Unique Rectangle on <14>.

R8C7 - removing <14> from <148> leaving <8>

R8C1 can only be <6>

R7C8 can only be <3>

R7C9 can only be <6>

R4C8 can only be <1>

R7C2 can only be <8>

R2C1 can only be <4>

R3C1 can only be <8>

R3C2 can only be <3>

R3C9 can only be <4>

R2C2 can only be <6>

R8C9 can only be <1>

R4C2 can only be <4>

R2C8 can only be <8>

R5C7 can only be <3>

R5C4 can only be <2>

R2C7 can only be <1>

R8C3 can only be <4>

R2C9 can only be <3>

R9C7 can only be <4>

R9C3 can only be <1>

R6C2 can only be <1>

R5C6 can only be <1>

R2C4 can only be <5>

R6C6 can only be <9>

R6C4 can only be <4>

R8C6 can only be <3>

R8C4 can only be <9>

R4C6 can only be <5>

R2C6 can only be <2>

R4C4 can only be <3>



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