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Daily Sudoku Answer 



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Nov 16 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s028889



Reasoning 



R2C4 can only be <2>

R5C5 can only be <2>

R5C8 can only be <8>

R1C4 is the only square in row 1 that can be <6>

R2C2 is the only square in row 2 that can be <8>

R4C1 is the only square in row 4 that can be <8>

R4C9 is the only square in row 4 that can be <2>

R6C1 is the only square in row 6 that can be <2>

R9C6 is the only square in row 9 that can be <2>

R7C1 is the only square in column 1 that can be <9>

R9C1 is the only square in column 1 that can be <4>

R1C3 is the only square in column 3 that can be <5>

Squares R7C4 and R7C9 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C6 - removing <5> from <145> leaving <14>

Squares R7C5 and R7C6 in block 8 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.

R8C5 - removing <1> from <137> leaving <37>

R8C6 - removing <1> from <1359> leaving <359>

Intersection of row 1 with block 3. The value <7> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R3C9 - removing <7> from <379> leaving <39>

Intersection of row 9 with block 9. The value <3> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 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 <3> from <135> leaving <15>

Intersection of column 9 with block 3. The value <9> only appears in one or more of squares R1C9, R2C9 and R3C9 of column 9. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <9> from <1379> leaving <137>

Squares R1C7<137>, R6C7<37> and R9C7<13> in column 7 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <137>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C7 - removing <3> from <349> leaving <49>

R5C7 - removing <7> from <479> leaving <49>

Intersection of row 5 with block 4. The value <7> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. 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 <7> from <167> leaving <16>

R6C3 - removing <7> from <137> leaving <13>

Squares R7C5, R7C6, R2C5 and R2C6 form a Type-2 Unique Rectangle on <14>.

R1C6 - removing <3> from <139> leaving <19>

R3C5 - removing <3> from <137> leaving <17>

R2C8 - removing <3> from <13> leaving <1>

R3C6 - removing <3> from <1359> leaving <159>

R8C8 can only be <5>

R7C9 can only be <8>

R7C4 can only be <5>

R9C9 can only be <3>

R9C7 can only be <1>

R3C9 can only be <9>

R1C9 can only be <7>

R3C4 can only be <7>

R9C3 can only be <7>

R1C7 can only be <3>

R6C9 can only be <5>

R3C5 can only be <1>

R8C4 can only be <9>

R9C4 can only be <8>

R3C1 can only be <3>

R3C6 can only be <5>

R7C5 can only be <4>

R1C6 can only be <9>

R7C6 can only be <1>

R2C5 can only be <3>

R8C6 can only be <3>

R8C5 can only be <7>

R2C6 can only be <4>

R5C3 can only be <4>

R8C2 can only be <1>

R1C1 can only be <1>

R6C7 can only be <7>

R5C7 can only be <9>

R4C3 can only be <3>

R5C2 can only be <7>

R4C7 can only be <4>

R6C2 can only be <6>

R4C8 can only be <6>

R6C3 can only be <1>

R4C2 can only be <9>

R6C8 can only be <3>



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