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Daily Sudoku Answer 



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Feb 03 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s305571



Reasoning 



R1C1 can only be <1>

R1C9 can only be <8>

R5C5 can only be <1>

R2C2 can only be <2>

R3C3 can only be <6>

R7C7 is the only square in block 9 that can be <4>

Squares R2C4 and R2C8 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C6 - removing <13> from <1368> leaving <68>

Squares R3C6 and R3C7 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C4 - removing <13> from <1239> leaving <29>

Squares R9C1 and R9C9 in row 9 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.

R9C4 - removing <39> from <2349> leaving <24>

R9C5 - removing <9> from <2459> leaving <245>

R9C6 - removing <3> from <35> leaving <5>

R1C6 can only be <7>

R1C4 can only be <4>

R1C5 can only be <5>

R9C4 can only be <2>

R9C5 can only be <4>

R3C4 can only be <9>

R3C5 can only be <2>

R7C5 is the only square in row 7 that can be <9>

R8C4 is the only square in row 8 that can be <7>

Squares R6C3 and R7C3 in column 3 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.

R5C3 - removing <38> from <2358> leaving <25>

Squares R6C9 and R9C9 in column 9 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 column.

R4C9 - removing <9> from <279> leaving <27>

R5C9 - removing <3> from <237> leaving <27>

Squares R2C5, R2C6, R8C5 and R8C6 form a Type-1 Unique Rectangle on <68>.

R8C6 - removing <68> from <368> leaving <3>

R8C8 can only be <9>

R3C6 can only be <1>

R7C4 can only be <1>

R8C2 can only be <8>

R9C9 can only be <3>

R9C1 can only be <9>

R6C9 can only be <9>

R3C7 can only be <3>

R7C6 can only be <8>

R2C4 can only be <3>

R5C7 can only be <8>

R2C8 can only be <1>

R5C2 can only be <4>

R7C3 can only be <3>

R2C6 can only be <6>

R8C5 can only be <6>

R2C5 can only be <8>

R4C8 can only be <5>

R4C3 can only be <2>

R5C8 can only be <3>

R6C2 can only be <1>

R5C1 can only be <7>

R6C8 can only be <4>

R6C7 can only be <6>

R4C2 can only be <9>

R6C1 can only be <3>

R4C7 can only be <1>

R6C3 can only be <8>

R4C9 can only be <7>

R5C3 can only be <5>

R4C1 can only be <6>

R5C9 can only be <2>



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