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Daily Sudoku Answer 



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Feb 25 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s242608



Reasoning 



R6C7 can only be <1>

R6C1 can only be <7>

R6C3 can only be <8>

R5C2 can only be <2>

R6C5 can only be <6>

R6C9 can only be <4>

R1C4 is the only square in row 1 that can be <4>

R1C6 is the only square in row 1 that can be <8>

R5C6 can only be <7>

R7C9 is the only square in row 7 that can be <8>

R4C9 can only be <9>

R4C7 can only be <5>

R5C8 can only be <8>

R4C5 is the only square in row 4 that can be <8>

R7C7 is the only square in row 7 that can be <7>

R1C2 is the only square in row 1 that can be <7>

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

R3C9 is the only square in row 3 that can be <7>

R9C2 is the only square in row 9 that can be <4>

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

Squares R1C3 and R4C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C3 - removing <13> from <1235> leaving <25>

R7C3 - removing <3> from <2356> leaving <256>

R9C3 - removing <3> from <2356> leaving <256>

Intersection of row 8 with block 9. The value <6> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R9C8 - removing <6> from <356> leaving <35>

Squares R2C1 and R2C9 in row 2 and R8C1 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 1 and 9 can be removed.

R3C1 - removing <2> from <1235> leaving <135>

R7C1 - removing <2> from <235> leaving <35>

Squares R3C1<135>, R4C1<13> and R7C1<35> in column 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <135>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C1 - removing <13> from <1239> leaving <29>

R8C1 - removing <35> from <2359> leaving <29>

Squares R2C2 and R8C2 in column 2 and R2C5 and R8C5 in column 5 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 2 and 8 can be removed.

R2C8 - removing <3> from <136> leaving <16>

R8C8 - removing <3> from <356> leaving <56>

Intersection of block 9 with row 9. The value <3> only appears in one or more of squares R9C7, R9C8 and R9C9 of block 9. These squares are the ones that intersect with row 9. Thus, the other (non-intersecting) squares of row 9 cannot contain this value.

R9C6 - removing <3> from <236> leaving <26>

Squares R3C6 (XY), R3C7 (XZ) and R9C6 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.

R9C7 - removing <2> from <23> leaving <3>

R9C8 can only be <5>

R3C7 can only be <2>

R8C8 can only be <6>

R3C3 can only be <5>

R2C9 can only be <6>

R8C9 can only be <2>

R2C8 can only be <1>

R8C1 can only be <9>

R2C5 can only be <3>

R1C8 can only be <3>

R8C2 can only be <3>

R2C1 can only be <2>

R8C5 can only be <5>

R2C2 can only be <9>

R7C1 can only be <5>

R5C5 can only be <1>

R7C4 can only be <6>

R1C3 can only be <1>

R3C6 can only be <6>

R3C4 can only be <1>

R9C6 can only be <2>

R5C4 can only be <5>

R7C3 can only be <2>

R9C3 can only be <6>

R7C6 can only be <3>

R4C3 can only be <3>

R3C1 can only be <3>

R4C1 can only be <1>



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