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Daily Sudoku Answer 



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Oct 26 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s084198



Reasoning 



R3C2 can only be <6>

R2C4 is the only square in row 2 that can be <6>

R2C9 is the only square in row 2 that can be <9>

R6C4 is the only square in row 6 that can be <1>

R7C1 is the only square in row 7 that can be <3>

R8C1 is the only square in column 1 that can be <9>

R2C3 is the only square in column 3 that can be <8>

R4C7 is the only square in column 7 that can be <6>

Intersection of row 2 with block 3. The value <5> 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.

R1C7 - removing <5> from <3457> leaving <347>

R1C9 - removing <5> from <13457> leaving <1347>

Intersection of row 5 with block 5. The values <467> 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.

R4C5 - removing <47> from <45789> leaving <589>

R4C6 - removing <7> from <5789> leaving <589>

R6C5 - removing <467> from <4567> leaving <5>

R1C6 is the only square in row 1 that can be <5>

R3C6 is the only square in column 6 that can be <1>

R5C6 is the only square in column 6 that can be <7>

R5C4 can only be <4>

R5C5 can only be <6>

R8C6 is the only square in column 6 that can be <6>

Intersection of column 7 with block 3. The value <7> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. 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 <7> from <1347> leaving <134>

R3C9 - removing <7> from <378> leaving <38>

Squares R4C5, R4C6, R7C5 and R7C6 form a Type-1 Unique Rectangle on <89>.

R7C5 - removing <89> from <489> leaving <4>

R9C5 can only be <7>

R9C4 can only be <5>

R1C5 can only be <3>

R3C5 can only be <9>

R3C4 can only be <7>

R4C5 can only be <8>

R4C6 can only be <9>

R7C6 can only be <8>

R7C4 can only be <9>

R4C8 is the only square in column 8 that can be <4>

R4C1 can only be <7>

R6C9 can only be <7>

R4C9 can only be <5>

R2C1 can only be <1>

R2C8 can only be <5>

R1C1 can only be <2>

R2C7 can only be <7>

R7C8 can only be <1>

R7C3 can only be <5>

R1C3 can only be <7>

R1C7 can only be <4>

R1C9 can only be <1>

R9C7 can only be <3>

R8C3 can only be <2>

R8C2 can only be <4>

R6C3 can only be <6>

R9C9 can only be <4>

R3C7 can only be <8>

R9C1 can only be <6>

R8C9 can only be <8>

R3C9 can only be <3>

R8C7 can only be <5>

R6C1 can only be <4>

R9C3 can only be <1>

R6C2 can only be <2>



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