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Daily Sudoku Answer 



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May 04 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s023535



Reasoning 



R1C1 is the only square in row 1 that can be <8>

R2C1 is the only square in row 2 that can be <2>

R8C2 is the only square in row 8 that can be <8>

Intersection of row 1 with block 3. The value <3> 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.

R2C8 - removing <3> from <1356> leaving <156>

R2C9 - removing <3> from <1346> leaving <146>

Intersection of row 8 with block 9. The values <36> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.

R7C7 - removing <3> from <357> leaving <57>

R7C8 - removing <3> from <1357> leaving <157>

Squares R7C7 and R9C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C7 - removing <5> from <356> leaving <36>

R3C7 - removing <57> from <4567> leaving <46>

R5C7 - removing <7> from <3467> leaving <346>

R1C3 is the only square in row 1 that can be <5>

R3C8 is the only square in row 3 that can be <7>

R2C8 is the only square in block 3 that can be <5>

R7C8 can only be <1>

R2C9 is the only square in column 9 that can be <1>

R3C7 is the only square in block 3 that can be <4>

R3C5 can only be <9>

R8C5 can only be <7>

R2C2 is the only square in row 2 that can be <9>

R2C4 is the only square in row 2 that can be <6>

Squares R7C7 and R9C7 in block 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R9C9 - removing <7> from <79> leaving <9>

R9C3 can only be <1>

R3C3 can only be <6>

R8C1 can only be <5>

R3C2 can only be <1>

R5C3 can only be <3>

R5C7 can only be <6>

R7C3 can only be <9>

R1C7 can only be <3>

R9C1 can only be <7>

R9C7 can only be <5>

R6C1 can only be <4>

R7C2 can only be <3>

R7C7 can only be <7>

R1C9 can only be <6>

R8C9 can only be <3>

R5C2 can only be <7>

R4C2 can only be <6>

R6C2 can only be <5>

R4C1 can only be <1>

R8C8 can only be <6>

R6C9 can only be <7>

R4C9 can only be <4>

R4C4 can only be <2>

R4C8 can only be <3>

R5C5 can only be <4>

R4C6 can only be <7>

R6C8 can only be <8>

R2C5 can only be <3>

R7C5 can only be <2>

R6C4 can only be <9>

R5C8 can only be <2>

R2C6 can only be <4>

R7C6 can only be <5>

R6C6 can only be <3>

R8C4 can only be <1>

R7C4 can only be <4>

R3C6 can only be <8>

R8C6 can only be <9>

R5C4 can only be <8>

R3C4 can only be <5>

R5C6 can only be <1>



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