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Daily Sudoku Answer 



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Feb 15 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C2 can only be <1>

R4C5 can only be <9>

R9C2 can only be <6>

R4C3 can only be <7>

R1C8 is the only square in row 1 that can be <6>

R4C8 can only be <2>

R4C7 can only be <6>

R1C9 is the only square in row 1 that can be <7>

R3C3 is the only square in row 3 that can be <6>

R5C9 is the only square in row 5 that can be <1>

R5C3 is the only square in row 5 that can be <9>

R8C8 is the only square in row 8 that can be <9>

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

R6C7 is the only square in row 6 that can be <7>

Squares R5C5 and R6C5 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.

R1C5 - removing <8> from <458> leaving <45>

R3C5 - removing <8> from <1248> leaving <124>

R7C5 - removing <38> from <2358> leaving <25>

R9C5 - removing <8> from <128> leaving <12>

R1C2 is the only square in row 1 that can be <8>

R7C6 is the only square in row 7 that can be <3>

R9C9 is the only square in row 9 that can be <8>

R7C4 is the only square in row 7 that can be <8>

R3C4 can only be <1>

R8C1 is the only square in row 8 that can be <1>

R9C1 can only be <2>

R9C5 can only be <1>

Squares R5C5 and R6C5 in block 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 block.

R5C6 - removing <8> from <678> leaving <67>

Intersection of column 1 with block 1. The value <5> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C2 - removing <5> from <345> leaving <34>

Squares R2C6 and R2C9 in row 2 and R8C6 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 6 and 9 can be removed.

R3C6 - removing <2> from <28> leaving <8>

R2C8 is the only square in row 2 that can be <8>

R6C8 can only be <4>

R6C3 can only be <5>

R5C7 can only be <8>

R5C5 can only be <3>

R6C2 can only be <3>

R7C3 can only be <4>

R7C7 can only be <2>

R8C2 can only be <5>

R7C5 can only be <5>

R3C7 can only be <4>

R8C9 can only be <4>

R8C4 can only be <6>

R8C6 can only be <2>

R5C4 can only be <7>

R2C6 can only be <7>

R2C9 can only be <2>

R2C4 can only be <5>

R5C6 can only be <6>

R3C5 can only be <2>

R5C1 can only be <4>

R6C5 can only be <8>

R2C2 can only be <4>

R1C5 can only be <4>

R1C1 can only be <5>

R2C1 can only be <3>



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