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Daily Sudoku Answer 



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Sep 01 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s026854



Reasoning 



R1C4 can only be <7>

R3C4 can only be <4>

R2C4 can only be <9>

R1C5 is the only square in row 1 that can be <2>

R4C6 is the only square in row 4 that can be <2>

R6C2 is the only square in row 6 that can be <4>

R8C1 is the only square in row 8 that can be <4>

R2C3 is the only square in row 2 that can be <4>

R2C2 is the only square in row 2 that can be <5>

R4C2 can only be <9>

R5C2 can only be <6>

R9C8 is the only square in row 9 that can be <2>

R9C5 is the only square in row 9 that can be <4>

R1C2 is the only square in column 2 that can be <1>

R7C3 is the only square in column 3 that can be <9>

R2C1 is the only square in block 1 that can be <7>

R7C1 can only be <6>

R1C1 can only be <8>

Squares R5C7 and R9C7 in column 7 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.

R3C7 - removing <7> from <1367> leaving <136>

R6C7 - removing <8> from <138> leaving <13>

R7C7 - removing <7> from <157> leaving <15>

R8C7 - removing <7> from <1567> leaving <156>

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

Intersection of row 7 with block 8. The value <7> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R8C6 - removing <7> from <1379> leaving <139>

R9C6 - removing <7> from <379> leaving <39>

R7C6 is the only square in column 6 that can be <7>

Intersection of column 5 with block 5. The values <79> only appears in one or more of squares R4C5, R5C5 and R6C5 of column 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.

R6C6 - removing <9> from <369> leaving <36>

Intersection of column 9 with block 9. The value <9> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R8C8 - removing <9> from <1679> leaving <167>

Squares R3C5 and R3C7 in row 3 and R7C5 and R7C7 in row 7 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 5 and 7 can be removed.

R6C7 - removing <1> from <13> leaving <3>

R8C7 - removing <1> from <156> leaving <56>

R6C4 can only be <8>

R6C6 can only be <6>

R6C5 can only be <9>

R2C6 can only be <1>

R2C9 can only be <8>

R3C5 can only be <6>

R2C8 can only be <6>

R9C9 can only be <9>

R3C3 can only be <3>

R3C7 can only be <1>

R7C7 can only be <5>

R6C8 can only be <1>

R7C5 can only be <1>

R8C7 can only be <6>

R8C8 can only be <7>

R8C2 can only be <3>

R4C8 can only be <8>

R9C7 can only be <8>

R5C7 can only be <7>

R9C6 can only be <3>

R8C9 can only be <1>

R1C8 can only be <3>

R1C3 can only be <6>

R4C3 can only be <5>

R5C8 can only be <9>

R5C5 can only be <5>

R8C4 can only be <5>

R8C6 can only be <9>

R9C2 can only be <7>

R4C4 can only be <3>

R4C5 can only be <7>

R5C3 can only be <8>



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