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Daily Sudoku Answer 



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Dec 15 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s076377



Reasoning 



R6C7 can only be <3>

R6C3 can only be <9>

R4C7 can only be <1>

R6C5 can only be <7>

R6C9 can only be <6>

R6C4 can only be <8>

R1C4 is the only square in row 1 that can be <1>

R1C8 is the only square in row 1 that can be <6>

R4C1 is the only square in row 4 that can be <6>

R5C4 is the only square in row 5 that can be <6>

R9C2 is the only square in row 9 that can be <6>

R9C6 is the only square in row 9 that can be <8>

R9C4 is the only square in row 9 that can be <5>

R3C5 is the only square in row 3 that can be <5>

R2C7 is the only square in row 2 that can be <5>

R5C6 is the only square in row 5 that can be <5>

R4C3 is the only square in row 4 that can be <5>

R5C5 is the only square in row 5 that can be <2>

R7C5 can only be <3>

R4C5 can only be <9>

R4C6 can only be <3>

Squares R2C8 and R3C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R7C8 - removing <7> from <147> leaving <14>

R8C8 - removing <7> from <179> leaving <19>

Squares R2C8 and R3C8 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C9 - removing <7> from <2347> leaving <234>

R3C9 - removing <7> from <237> leaving <23>

Squares R2C2 and R2C6 in row 2 and R7C2 and R7C6 in row 7 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 2 and 6 can be removed.

R1C6 - removing <2> from <279> leaving <79>

R3C2 - removing <2> from <238> leaving <38>

R8C2 - removing <2> from <1239> leaving <139>

Squares R3C2 and R5C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C2 - removing <8> from <289> leaving <29>

R8C2 - removing <3> from <139> leaving <19>

R8C3 is the only square in row 8 that can be <3>

Squares R8C2 and R8C8 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C9 - removing <9> from <279> leaving <27>

Squares R3C4 and R3C9 in row 3 and R8C4 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 4 and 9 can be removed.

R1C9 - removing <2> from <234> leaving <34>

R9C9 - removing <2> from <2479> leaving <479>

Squares R1C3 (XY), R2C2 (XZ) and R1C6 (YZ) form an XY-Wing pattern on <9>. All squares that are buddies of both the XZ and YZ squares cannot be <9>.

R1C1 - removing <9> from <379> leaving <37>

R2C6 - removing <9> from <279> leaving <27>

R1C6 is the only square in row 1 that can be <9>

Intersection of row 1 with block 1. The value <7> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C1 - removing <7> from <789> leaving <89>

Squares R7C8 (XY), R7C2 (XZ) and R9C7 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.

R9C3 - removing <2> from <27> leaving <7>

R1C3 can only be <2>

R7C1 can only be <4>

R1C7 can only be <4>

R2C2 can only be <9>

R1C9 can only be <3>

R9C7 can only be <2>

R1C1 can only be <7>

R3C9 can only be <2>

R2C1 can only be <8>

R8C2 can only be <1>

R3C4 can only be <7>

R8C9 can only be <7>

R7C8 can only be <1>

R9C1 can only be <9>

R7C2 can only be <2>

R8C8 can only be <9>

R5C8 can only be <4>

R9C9 can only be <4>

R8C4 can only be <2>

R5C9 can only be <9>

R2C8 can only be <7>

R5C1 can only be <3>

R3C2 can only be <3>

R2C6 can only be <2>

R3C8 can only be <8>

R5C2 can only be <8>

R7C6 can only be <7>



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