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Daily Sudoku Answer 



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Feb 24 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s032341



Reasoning 



R6C4 can only be <2>

R6C6 can only be <3>

R4C4 can only be <8>

R6C1 can only be <5>

R6C9 can only be <6>

R4C6 can only be <7>

R5C5 can only be <6>

R1C1 is the only square in row 1 that can be <6>

R1C3 is the only square in row 1 that can be <9>

R5C1 is the only square in row 5 that can be <9>

R7C8 is the only square in row 7 that can be <9>

R8C2 is the only square in row 8 that can be <6>

R7C2 is the only square in column 2 that can be <7>

R7C5 can only be <3>

Intersection of row 1 with block 3. The value <3> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R3C8 - removing <3> from <234> leaving <24>

R3C9 - removing <3> from <1234> leaving <124>

Intersection of block 2 with row 1. The value <4> only appears in one or more of squares R1C4, R1C5 and R1C6 of block 2. These squares are the ones that intersect with row 1. Thus, the other (non-intersecting) squares of row 1 cannot contain this value.

R1C9 - removing <4> from <1348> leaving <138>

Intersection of block 8 with row 9. The values <45> only appears in one or more of squares R9C4, R9C5 and R9C6 of block 8. These squares are the ones that intersect with row 9. Thus, the other (non-intersecting) squares of row 9 cannot contain these values.

R9C1 - removing <4> from <1234> leaving <123>

R9C3 - removing <4> from <1234> leaving <123>

R9C9 - removing <4> from <23478> leaving <2378>

Squares R2C3 and R2C5 in row 2 and R8C3 and R8C5 in row 8 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 3 and 5 can be removed.

R1C5 - removing <1> from <158> leaving <58>

R3C5 - removing <1> from <125> leaving <25>

R9C3 - removing <1> from <123> leaving <23>

R9C5 - removing <1> from <157> leaving <57>

Squares R4C1 and R4C9 in row 4 and R7C1 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 1 and 9 can be removed.

R3C9 - removing <2> from <124> leaving <14>

R5C9 - removing <2> from <2378> leaving <378>

R9C1 - removing <2> from <123> leaving <13>

R9C9 - removing <2> from <2378> leaving <378>

Squares R3C1 and R7C1 in column 1 and R3C9 and R7C9 in column 9 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in rows 3 and 7 can be removed.

R3C2 - removing <4> from <345> leaving <35>

R3C8 - removing <4> from <24> leaving <2>

R3C5 can only be <5>

R3C2 can only be <3>

R1C5 can only be <8>

R9C5 can only be <7>

R1C6 can only be <4>

R8C5 can only be <1>

R1C4 can only be <1>

R9C6 can only be <5>

R5C2 can only be <4>

R2C2 can only be <5>

R2C5 can only be <2>

R9C4 can only be <4>

R1C9 can only be <3>

R1C7 can only be <5>

R4C9 can only be <2>

R9C9 can only be <8>

R2C7 can only be <8>

R2C8 can only be <4>

R2C3 can only be <1>

R8C8 can only be <3>

R3C9 can only be <1>

R3C1 can only be <4>

R4C1 can only be <3>

R7C9 can only be <4>

R7C1 can only be <2>

R8C3 can only be <4>

R8C7 can only be <7>

R5C8 can only be <8>

R9C7 can only be <2>

R9C3 can only be <3>

R5C9 can only be <7>

R9C1 can only be <1>

R5C3 can only be <2>

R5C7 can only be <3>



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