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Daily Sudoku Answer 



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Oct 01 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s052253



Reasoning 



R1C4 can only be <3>

R5C5 can only be <3>

R1C1 is the only square in row 1 that can be <7>

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

R3C8 is the only square in row 3 that can be <6>

R4C2 is the only square in row 4 that can be <2>

R2C3 is the only square in row 2 that can be <2>

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

R5C2 is the only square in row 5 that can be <7>

R5C8 is the only square in row 5 that can be <8>

R8C3 is the only square in row 8 that can be <7>

R8C7 is the only square in row 8 that can be <8>

R9C4 is the only square in row 9 that can be <2>

R2C7 is the only square in column 7 that can be <9>

Squares R1C5 and R2C6 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C5 - removing <14> from <1456> leaving <56>

Squares R4C8 and R4C9 in block 6 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 block.

R6C8 - removing <3> from <3459> leaving <459>

R6C9 - removing <3> from <3459> leaving <459>

Intersection of row 3 with block 1. The value <4> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C2 - removing <4> from <134> leaving <13>

Intersection of row 7 with block 7. The value <4> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C2 - removing <4> from <3459> leaving <359>

Intersection of row 7 with block 9. The value <1> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R9C9 - removing <1> from <1359> leaving <359>

Intersection of column 1 with block 4. The value <4> only appears in one or more of squares R4C1, R5C1 and R6C1 of column 1. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R6C2 - removing <4> from <349> leaving <39>

Squares R3C3 and R7C3 in column 3 and R3C7 and R7C7 in column 7 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 3 and 7 can be removed.

R3C2 - removing <3> from <134> leaving <14>

R7C2 - removing <3> from <345> leaving <45>

R7C8 - removing <3> from <135> leaving <15>

Squares R5C1 and R5C9 in row 5 and R9C1 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 1 and 9 can be removed.

R6C1 - removing <9> from <349> leaving <34>

R6C9 - removing <9> from <459> leaving <45>

Squares R2C4, R2C5, R8C4 and R8C5 form a Type-1 Unique Rectangle on <56>.

R8C5 - removing <56> from <456> leaving <4>

R8C6 can only be <3>

R1C5 can only be <1>

R9C6 can only be <1>

R9C5 can only be <5>

R2C6 can only be <4>

R1C9 can only be <4>

R5C9 can only be <9>

R6C9 can only be <5>

R5C1 can only be <4>

R6C8 can only be <4>

R9C9 can only be <3>

R2C5 can only be <6>

R8C4 can only be <6>

R9C1 can only be <9>

R4C9 can only be <1>

R7C7 can only be <1>

R2C4 can only be <5>

R4C8 can only be <3>

R6C1 can only be <3>

R6C2 can only be <9>

R8C2 can only be <5>

R7C8 can only be <5>

R3C7 can only be <3>

R7C2 can only be <4>

R8C8 can only be <9>

R3C3 can only be <4>

R2C8 can only be <1>

R7C3 can only be <3>

R3C2 can only be <1>

R2C2 can only be <3>



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