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Daily Sudoku Answer 



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Sep 30 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s308324



Reasoning 



R3C4 can only be <3>

R5C7 is the only square in row 5 that can be <7>

R5C8 is the only square in row 5 that can be <6>

Squares R7C4 and R7C8 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C1 - removing <8> from <568> leaving <56>

R7C2 - removing <8> from <278> leaving <27>

R7C3 - removing <8> from <125678> leaving <12567>

R7C5 - removing <48> from <34589> leaving <359>

R7C7 - removing <48> from <123489> leaving <1239>

R7C9 - removing <4> from <2349> leaving <239>

Squares R6C5 and R8C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C5 - removing <4> from <24> leaving <2>

R5C5 - removing <48> from <12489> leaving <129>

R9C5 - removing <8> from <3589> leaving <359>

Squares R4C3 and R4C7 in row 4, R6C3, R6C5 and R6C7 in row 6 and R8C5 and R8C7 in row 8 form a Swordfish pattern on possibility <4>. All other instances of this possibility in columns 3, 5 and 7 can be removed.

R1C3 - removing <4> from <34679> leaving <3679>

R1C7 - removing <4> from <469> leaving <69>

R3C3 - removing <4> from <46789> leaving <6789>

R3C7 - removing <4> from <245689> leaving <25689>

R5C3 - removing <4> from <23458> leaving <2358>

Intersection of column 3 with block 4. The value <4> 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 <4> from <3458> leaving <358>

Squares R2C3 and R2C7 in row 2, R6C3 and R6C5 in row 6 and R8C3, R8C5 and R8C7 in row 8 form a Swordfish pattern on possibility <8>. All other instances of this possibility in columns 3, 5 and 7 can be removed.

R3C3 - removing <8> from <6789> leaving <679>

R3C7 - removing <8> from <25689> leaving <2569>

R5C3 - removing <8> from <2358> leaving <235>

R9C3 - removing <8> from <258> leaving <25>

R9C7 - removing <8> from <2389> leaving <239>

R9C1 is the only square in row 9 that can be <8>

R8C3 can only be <1>

R7C7 is the only square in row 7 that can be <1>

Squares R2C5 and R2C7 in row 2, R6C3 and R6C7 in row 6 and R9C3 and R9C5 in row 9 form a Swordfish pattern on possibility <5>. All other instances of this possibility in columns 3, 5 and 7 can be removed.

R3C5 - removing <5> from <1567> leaving <167>

R3C7 - removing <5> from <2569> leaving <269>

R5C3 - removing <5> from <235> leaving <23>

R7C3 - removing <5> from <2567> leaving <267>

R7C5 - removing <5> from <359> leaving <39>

Squares R3C1 (XY), R3C8 (XZ) and R2C3 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.

R2C7 - removing <8> from <568> leaving <56>

R3C2 - removing <8> from <78> leaving <7>

R7C2 can only be <2>

R5C2 can only be <8>

R9C3 can only be <5>

R7C1 can only be <6>

R5C4 can only be <4>

R6C3 can only be <4>

R7C4 can only be <8>

R6C5 can only be <8>

R6C7 can only be <5>

R4C3 can only be <3>

R8C5 can only be <4>

R2C7 can only be <6>

R5C9 can only be <3>

R7C3 can only be <7>

R3C1 can only be <4>

R7C8 can only be <4>

R3C8 can only be <8>

R8C7 can only be <8>

R2C3 can only be <8>

R2C5 can only be <5>

R1C7 can only be <9>

R1C1 can only be <3>

R4C7 can only be <4>

R5C3 can only be <2>

R5C1 can only be <5>

R7C9 can only be <9>

R7C5 can only be <3>

R7C6 can only be <5>

R1C9 can only be <4>

R9C9 can only be <2>

R9C7 can only be <3>

R3C9 can only be <5>

R1C3 can only be <6>

R3C7 can only be <2>

R3C6 can only be <1>

R3C5 can only be <6>

R5C6 can only be <9>

R5C5 can only be <1>

R9C5 can only be <9>

R1C5 can only be <7>

R3C3 can only be <9>



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