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Daily Sudoku Answer 



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Jul 01 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s029640



Reasoning 



R4C4 can only be <3>

R4C6 can only be <5>

R5C1 can only be <9>

R5C3 can only be <5>

R4C1 can only be <6>

R4C9 can only be <9>

R6C1 can only be <3>

R2C2 is the only square in row 2 that can be <5>

R5C5 is the only square in row 5 that can be <2>

R6C9 is the only square in row 6 that can be <6>

R7C2 is the only square in row 7 that can be <3>

R8C9 is the only square in row 8 that can be <5>

R9C5 is the only square in row 9 that can be <5>

R1C4 is the only square in column 4 that can be <2>

R9C6 is the only square in block 8 that can be <7>

Intersection of row 2 with block 3. The value <8> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C9 - removing <8> from <148> leaving <14>

Squares R1C9 and R5C9 in column 9 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.

R2C9 - removing <4> from <248> leaving <28>

R9C9 - removing <14> from <1248> leaving <28>

Squares R1C1<147>, R1C5<478>, R1C6<48> and R1C9<14> in row 1 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <1478>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C2 - removing <4> from <469> leaving <69>

R1C8 - removing <147> from <14679> leaving <69>

Squares R1C2 and R1C8 in row 1 and R9C2 and R9C8 in row 9 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 2 and 8 can be removed.

R2C8 - removing <9> from <2479> leaving <247>

R8C2 - removing <9> from <249> leaving <24>

R8C8 - removing <9> from <249> leaving <24>

Squares R8C2 and R8C8 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C1 - removing <24> from <247> leaving <7>

R8C7 - removing <4> from <489> leaving <89>

R1C5 is the only square in row 1 that can be <7>

R3C5 can only be <4>

R7C5 can only be <8>

R1C6 can only be <8>

R7C3 can only be <1>

R9C4 can only be <4>

R6C4 can only be <8>

R6C6 can only be <4>

R3C3 can only be <7>

R9C1 can only be <2>

R9C2 can only be <9>

R9C9 can only be <8>

R2C1 can only be <4>

R8C2 can only be <4>

R9C8 can only be <1>

R1C2 can only be <6>

R8C3 can only be <8>

R2C9 can only be <2>

R8C7 can only be <9>

R1C8 can only be <9>

R3C2 can only be <2>

R2C7 can only be <8>

R1C1 can only be <1>

R2C8 can only be <7>

R3C8 can only be <6>

R2C3 can only be <9>

R3C7 can only be <1>

R7C8 can only be <4>

R7C7 can only be <6>

R8C8 can only be <2>

R1C9 can only be <4>

R5C9 can only be <1>

R5C7 can only be <4>



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