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Daily Sudoku Answer 



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Dec 19 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s024448



Reasoning 



R7C6 can only be <9>

R7C5 can only be <4>

R8C5 can only be <3>

R8C8 can only be <9>

R7C4 can only be <6>

R5C5 can only be <2>

R5C6 can only be <3>

R2C5 can only be <9>

R3C5 can only be <8>

R5C4 can only be <4>

R2C9 is the only square in row 2 that can be <7>

R6C2 is the only square in column 2 that can be <8>

R3C6 is the only square in column 6 that can be <5>

R6C8 is the only square in column 8 that can be <1>

Squares R9C4 and R9C6 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C1 - removing <7> from <6789> leaving <689>

Intersection of column 3 with block 4. The value <5> only appears in one or more of squares R4C3, R5C3 and R6C3 of column 3. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R5C1 - removing <5> from <1579> leaving <179>

R6C1 - removing <5> from <2345> leaving <234>

Intersection of column 7 with block 6. The values <57> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain these values.

R5C9 - removing <5> from <59> leaving <9>

R6C9 - removing <5> from <2345> leaving <234>

R1C7 is the only square in row 1 that can be <9>

Squares R2C2 and R4C2 in column 2 and R2C8 and R4C8 in column 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 2 and 4 can be removed.

R2C1 - removing <3> from <235> leaving <25>

R4C1 - removing <3> from <23479> leaving <2479>

R4C7 - removing <3> from <367> leaving <67>

R4C9 - removing <3> from <2346> leaving <246>

Squares R9C4, R9C6, R1C4 and R1C6 form a Type-1 Unique Rectangle on <27>.

R1C4 - removing <27> from <237> leaving <3>

R3C4 can only be <2>

R9C4 can only be <7>

R1C6 can only be <7>

R9C6 can only be <2>

Squares R5C1 (XY), R3C1 (XZ) and R4C2 (YZ) form an XY-Wing pattern on <3>. All squares that are buddies of both the XZ and YZ squares cannot be <3>.

R2C2 - removing <3> from <35> leaving <5>

R6C1 - removing <3> from <234> leaving <24>

R2C1 can only be <2>

R8C2 can only be <7>

R4C2 can only be <3>

R2C8 can only be <3>

R6C1 can only be <4>

R4C8 can only be <2>

R3C9 can only be <1>

R3C1 can only be <3>

R1C9 can only be <2>

R4C3 can only be <9>

R6C9 can only be <3>

R6C7 can only be <5>

R4C1 can only be <7>

R9C3 can only be <8>

R6C3 can only be <2>

R5C7 can only be <7>

R9C9 can only be <6>

R1C3 can only be <1>

R7C1 can only be <5>

R9C1 can only be <9>

R9C7 can only be <3>

R4C9 can only be <4>

R8C9 can only be <5>

R1C1 can only be <8>

R5C3 can only be <5>

R4C7 can only be <6>

R5C1 can only be <1>

R7C9 can only be <8>

R8C1 can only be <6>



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