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Daily Sudoku Answer 



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Oct 25 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s037444



Reasoning 



R3C6 is the only square in row 3 that can be <7>

R2C1 is the only square in row 2 that can be <7>

R6C9 is the only square in row 6 that can be <7>

R4C6 is the only square in block 5 that can be <2>

R4C1 is the only square in row 4 that can be <1>

R5C9 is the only square in block 6 that can be <6>

R5C1 can only be <5>

R5C8 is the only square in row 5 that can be <9>

R5C2 is the only square in row 5 that can be <8>

R4C2 can only be <3>

R2C7 is the only square in column 7 that can be <3>

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

R1C7 is the only square in row 1 that can be <6>

R6C8 is the only square in column 8 that can be <3>

R6C4 can only be <5>

Squares R9C6 and R9C8 in row 9 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.

R9C3 - removing <58> from <24568> leaving <246>

R9C4 - removing <8> from <68> leaving <6>

R9C5 - removing <5> from <257> leaving <27>

R9C7 - removing <58> from <45789> leaving <479>

Intersection of row 2 with block 3. The value <8> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C9 - removing <8> from <24589> leaving <2459>

Intersection of column 1 with block 7. The values <49> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R7C3 - removing <4> from <34568> leaving <3568>

R9C3 - removing <4> from <24> leaving <2>

R9C5 can only be <7>

R6C3 can only be <6>

R8C1 can only be <9>

R6C1 can only be <2>

R9C1 can only be <4>

R9C7 can only be <9>

R7C1 can only be <6>

R3C9 is the only square in row 3 that can be <2>

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

R3C4 is the only square in row 3 that can be <9>

R1C9 is the only square in row 1 that can be <9>

R7C7 is the only square in row 7 that can be <4>

R3C7 can only be <5>

R3C8 can only be <1>

R4C7 can only be <8>

R3C3 can only be <4>

R2C8 can only be <8>

R4C9 can only be <5>

R8C7 can only be <7>

R8C9 can only be <8>

R8C2 can only be <5>

R2C9 can only be <4>

R9C8 can only be <5>

R9C6 can only be <8>

R8C3 can only be <3>

R7C2 can only be <7>

R8C4 can only be <1>

R7C3 can only be <8>

R8C5 can only be <2>

R7C4 can only be <3>

R7C6 can only be <5>

R5C4 can only be <4>

R1C6 can only be <1>

R1C3 can only be <5>

R5C6 can only be <3>

R2C5 can only be <5>

R2C3 can only be <1>

R1C5 can only be <4>

R5C5 can only be <1>

R1C4 can only be <8>



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