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Daily Sudoku Answer 



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Oct 20 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s036004



Reasoning 



R2C4 can only be <2>

R2C6 can only be <7>

R5C5 can only be <8>

R8C6 can only be <1>

R3C6 can only be <9>

R3C5 can only be <5>

R7C6 can only be <4>

R3C4 can only be <8>

R7C5 can only be <2>

R1C7 is the only square in row 1 that can be <8>

R4C7 is the only square in row 4 that can be <9>

R6C3 is the only square in row 6 that can be <5>

R3C7 is the only square in column 7 that can be <7>

Squares R6C2 and R7C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C2 - removing <6> from <246> leaving <24>

R4C2 - removing <8> from <248> leaving <24>

Squares R5C3 and R8C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C3 - removing <2> from <127> leaving <17>

R3C3 - removing <26> from <12346> leaving <134>

R4C3 - removing <2> from <248> leaving <48>

R7C3 - removing <6> from <6789> leaving <789>

R9C3 - removing <2> from <29> leaving <9>

R3C1 is the only square in row 3 that can be <6>

R7C9 is the only square in row 7 that can be <9>

Intersection of column 9 with block 3. The value <1> 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.

R3C8 - removing <1> from <123> leaving <23>

Squares R8C7<25>, R9C7<245> and R9C9<24> in block 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <245>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C7 - removing <5> from <135> leaving <13>

Squares R5C3 and R5C7 in row 5 and R8C3 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 3 and 7 can be removed.

R9C7 - removing <2> from <245> leaving <45>

Squares R1C1 and R1C9 in row 1 and R9C1 and R9C9 in row 9 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>

Squares R3C2 (XY), R3C8 (XZ) and R2C3 (YZ) form an XY-Wing pattern on <3>. All squares that are buddies of both the XZ and YZ squares cannot be <3>.

R2C7 - removing <3> from <34> leaving <4>

R3C3 - removing <3> from <134> leaving <14>

R2C3 can only be <3>

R9C7 can only be <5>

R3C9 can only be <1>

R3C3 can only be <4>

R1C9 can only be <2>

R9C1 can only be <2>

R8C7 can only be <2>

R1C1 can only be <7>

R9C9 can only be <4>

R3C8 can only be <3>

R3C2 can only be <2>

R4C3 can only be <8>

R7C8 can only be <1>

R4C8 can only be <2>

R7C3 can only be <7>

R6C2 can only be <6>

R4C2 can only be <4>

R5C7 can only be <6>

R5C3 can only be <2>

R6C7 can only be <1>

R7C2 can only be <8>

R6C8 can only be <8>

R7C7 can only be <3>

R7C1 can only be <5>

R1C3 can only be <1>

R8C3 can only be <6>

R7C4 can only be <6>

R8C4 can only be <5>



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