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Daily Sudoku Answer 



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Apr 23 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s087098



Reasoning 



R3C7 can only be <5>

R5C7 can only be <3>

R2C9 is the only square in row 2 that can be <3>

R9C8 is the only square in row 9 that can be <5>

R9C3 is the only square in column 3 that can be <3>

R9C2 is the only square in row 9 that can be <2>

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.

R2C1 - removing <4> from <1459> leaving <159>

R2C2 - removing <4> from <45> leaving <5>

R1C2 can only be <7>

R6C2 can only be <3>

R4C4 is the only square in row 4 that can be <3>

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.

R6C1 - removing <7> from <257> leaving <25>

Intersection of row 7 with block 7. The value <7> 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.

R8C1 - removing <7> from <4789> leaving <489>

Intersection of row 9 with block 8. The values <18> only appears in one or more of squares R9C4, R9C5 and R9C6 of row 9. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R7C5 - removing <8> from <68> leaving <6>

R8C4 - removing <8> from <478> leaving <47>

R8C6 - removing <8> from <46789> leaving <4679>

R1C7 is the only square in column 7 that can be <6>

R2C6 is the only square in row 2 that can be <6>

R2C4 is the only square in row 2 that can be <4>

R8C4 can only be <7>

R6C4 can only be <2>

R6C1 can only be <5>

R6C6 can only be <7>

Squares R9C4 and R9C5 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C6 - removing <8> from <489> leaving <49>

Squares R7C7 and R9C7 in block 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C9 - removing <9> from <89> leaving <8>

R8C8 - removing <9> from <2689> leaving <268>

R8C9 - removing <9> from <2689> leaving <268>

R3C9 can only be <1>

R2C8 can only be <9>

R2C1 can only be <1>

R1C8 can only be <8>

R6C8 can only be <6>

R6C9 can only be <9>

R8C8 can only be <2>

R8C9 can only be <6>

R4C8 can only be <1>

R1C4 can only be <1>

R1C6 can only be <5>

R9C4 can only be <8>

R1C5 can only be <2>

R4C6 can only be <8>

R4C2 can only be <4>

R5C5 can only be <5>

R5C9 can only be <2>

R5C3 can only be <7>

R4C9 can only be <5>

R9C5 can only be <1>

R1C3 can only be <9>

R3C5 can only be <8>

R4C1 can only be <2>

R8C2 can only be <8>

R5C1 can only be <8>

R7C3 can only be <4>

R3C1 can only be <4>

R7C7 can only be <9>

R3C3 can only be <2>

R8C1 can only be <9>

R7C1 can only be <7>

R9C7 can only be <4>

R8C6 can only be <4>

R9C6 can only be <9>



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