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Daily Sudoku Answer 



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Oct 09 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s038307



Reasoning 



R2C3 can only be <9>

R5C2 is the only square in column 2 that can be <4>

R6C9 is the only square in column 9 that can be <7>

Intersection of row 5 with block 5. The values <37> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.

R6C5 - removing <3> from <138> leaving <18>

R6C6 - removing <3> from <12389> leaving <1289>

Intersection of column 2 with block 7. The value <1> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C3 - removing <1> from <1357> leaving <357>

R9C3 - removing <1> from <1235> leaving <235>

Squares R2C9<48>, R3C9<58> and R8C9<45> in column 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <458>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C9 - removing <8> from <289> leaving <29>

R7C9 - removing <4> from <249> leaving <29>

Intersection of row 7 with block 8. The value <4> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R8C5 - removing <4> from <134> leaving <13>

Intersection of column 9 with block 3. The value <8> only appears in one or more of squares R1C9, R2C9 and R3C9 of column 9. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <8> from <4689> leaving <469>

R2C7 - removing <8> from <1468> leaving <146>

Squares R2C5 and R2C7 in row 2 and R8C5 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 5 and 7 can be removed.

R4C5 - removing <1> from <1468> leaving <468>

R6C5 - removing <1> from <18> leaving <8>

R9C7 - removing <1> from <139> leaving <39>

R6C7 can only be <9>

R9C7 can only be <3>

R4C9 can only be <2>

R4C1 can only be <5>

R7C9 can only be <9>

R5C8 can only be <6>

R5C4 can only be <7>

R5C5 can only be <3>

R4C7 can only be <8>

R4C3 can only be <1>

R5C6 can only be <2>

R8C5 can only be <1>

R6C6 can only be <1>

R6C4 can only be <5>

R8C7 can only be <4>

R8C9 can only be <5>

R1C7 can only be <6>

R3C9 can only be <8>

R2C7 can only be <1>

R3C8 can only be <5>

R1C8 can only be <9>

R3C2 can only be <3>

R3C6 can only be <7>

R2C9 can only be <4>

R2C5 can only be <6>

R3C1 can only be <6>

R2C1 can only be <8>

R4C5 can only be <4>

R3C4 can only be <1>

R4C6 can only be <9>

R4C4 can only be <6>

R9C6 can only be <8>

R9C4 can only be <9>

R1C6 can only be <4>

R7C4 can only be <4>

R1C4 can only be <8>

R7C6 can only be <3>

R1C2 can only be <5>

R7C1 can only be <2>

R1C3 can only be <7>

R9C2 can only be <1>

R8C3 can only be <3>

R7C8 can only be <1>

R6C1 can only be <3>

R9C3 can only be <5>

R7C2 can only be <8>

R9C8 can only be <2>

R8C1 can only be <7>

R6C3 can only be <2>



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