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Daily Sudoku Answer 



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Mar 17 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s031283



Reasoning 



R1C3 can only be <7>

R9C8 can only be <8>

R1C2 can only be <9>

R9C7 can only be <5>

R5C8 can only be <7>

R8C7 can only be <2>

R1C7 can only be <1>

R7C9 can only be <9>

R6C1 is the only square in row 6 that can be <7>

R8C2 is the only square in row 8 that can be <7>

R8C1 is the only square in row 8 that can be <9>

R9C4 is the only square in row 9 that can be <1>

R4C9 is the only square in row 4 that can be <1>

R5C5 is the only square in row 5 that can be <1>

R7C1 is the only square in row 7 that can be <1>

R5C1 is the only square in column 1 that can be <5>

R8C5 is the only square in column 5 that can be <3>

R6C9 is the only square in block 6 that can be <2>

R6C4 can only be <5>

Squares R2C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C3 - removing <3> from <38> leaving <8>

R7C3 - removing <4> from <4568> leaving <568>

R6C6 can only be <3>

R7C2 is the only square in row 7 that can be <8>

Intersection of column 5 with block 2. The value <8> only appears in one or more of squares R1C5, R2C5 and R3C5 of column 5. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R3C6 - removing <8> from <5689> leaving <569>

Squares R8C3, R8C6, R7C3 and R7C6 form a Type-1 Unique Rectangle on <56>.

R7C6 - removing <56> from <2456> leaving <24>

Squares R8C6 (XY), R7C5 (XZ) and R1C6 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.

R7C6 - removing <2> from <24> leaving <4>

R2C5 - removing <2> from <28> leaving <8>

R3C5 can only be <5>

R7C5 can only be <2>

R7C4 can only be <6>

R7C3 can only be <5>

R8C6 can only be <5>

R8C3 can only be <6>

Squares R2C3 and R2C7 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C9 - removing <3> from <37> leaving <7>

R3C4 is the only square in row 3 that can be <7>

Squares R2C7 and R4C1 form a remote naked pair. <34> can be removed from any square that is common to their groups.

R4C7 - removing <3> from <38> leaving <8>

R4C6 can only be <2>

R5C9 can only be <3>

R5C2 can only be <4>

R3C9 can only be <8>

R4C4 can only be <4>

R1C6 can only be <6>

R5C4 can only be <9>

R9C2 can only be <3>

R4C1 can only be <3>

R5C6 can only be <8>

R2C4 can only be <2>

R9C3 can only be <4>

R2C3 can only be <3>

R1C8 can only be <2>

R3C6 can only be <9>

R2C8 can only be <9>

R2C7 can only be <4>

R3C1 can only be <4>

R3C7 can only be <3>

R3C8 can only be <6>



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