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Daily Sudoku Answer 



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Sep 16 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s311211



Reasoning 



R2C3 can only be <3>

R9C4 can only be <4>

R2C8 is the only square in row 2 that can be <7>

R4C8 is the only square in row 4 that can be <2>

R3C2 is the only square in row 3 that can be <2>

R2C7 is the only square in column 7 that can be <2>

Squares R2C1<145>, R2C2<145> and R2C4<15> in row 2 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <145>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C5 - removing <145> from <145689> leaving <689>

R2C6 - removing <5> from <5689> leaving <689>

R2C9 - removing <4> from <489> leaving <89>

Intersection of row 2 with block 1. The value <4> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C2 - removing <4> from <145> leaving <15>

Intersection of block 3 with column 8. The value <4> only appears in one or more of squares R1C8, R2C8 and R3C8 of block 3. These squares are the ones that intersect with column 8. Thus, the other (non-intersecting) squares of column 8 cannot contain this value.

R5C8 - removing <4> from <145689> leaving <15689>

R6C8 - removing <4> from <14569> leaving <1569>

R8C8 - removing <4> from <34569> leaving <3569>

Squares R5C3 and R8C3 in column 3 and R5C7 and R8C7 in column 7 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in rows 5 and 8 can be removed.

R5C2 - removing <9> from <3456789> leaving <345678>

R8C2 - removing <9> from <13689> leaving <1368>

R5C6 - removing <9> from <59> leaving <5>

R5C8 - removing <9> from <15689> leaving <1568>

R8C8 - removing <9> from <3569> leaving <356>

R5C9 - removing <9> from <45689> leaving <4568>

R8C9 - removing <9> from <4569> leaving <456>

R2C6 is the only square in column 6 that can be <9>

R2C9 can only be <8>

R3C5 can only be <4>

R2C5 can only be <6>

R1C8 can only be <4>

R3C8 can only be <9>

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

R8C3 can only be <6>

R5C3 can only be <9>

R7C2 can only be <3>

R5C7 can only be <4>

R5C9 can only be <6>

R8C7 can only be <9>

R7C5 can only be <5>

R7C8 can only be <6>

R9C8 can only be <3>

R9C5 can only be <8>

R8C8 can only be <5>

R8C9 can only be <4>

R6C8 can only be <1>

R9C6 can only be <6>

R1C5 can only be <1>

R8C6 can only be <2>

R1C2 can only be <5>

R6C5 can only be <9>

R2C4 can only be <5>

R1C4 can only be <2>

R6C9 can only be <5>

R4C5 can only be <7>

R5C8 can only be <8>

R6C1 can only be <4>

R4C9 can only be <9>

R8C4 can only be <7>

R1C6 can only be <8>

R4C2 can only be <8>

R8C5 can only be <3>

R5C4 can only be <1>

R5C1 can only be <3>

R5C2 can only be <7>

R6C2 can only be <6>

R2C1 can only be <1>

R2C2 can only be <4>

R8C1 can only be <8>

R4C1 can only be <5>

R8C2 can only be <1>



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