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Daily Sudoku Answer 



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Oct 28 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s193145



Reasoning 



R3C7 is the only square in row 3 that can be <2>

R7C7 can only be <6>

R7C3 can only be <4>

R3C3 is the only square in row 3 that can be <1>

R3C5 is the only square in row 3 that can be <8>

R1C2 is the only square in row 1 that can be <8>

R5C3 is the only square in column 3 that can be <6>

R8C9 is the only square in column 9 that can be <8>

Squares R3C4 and R3C6 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C4 - removing <46> from <34569> leaving <359>

R2C5 - removing <4> from <4579> leaving <579>

R2C6 - removing <46> from <34679> leaving <379>

Squares R4C3 and R6C3 in block 4 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 block.

R4C2 - removing <5> from <3457> leaving <347>

R5C1 - removing <5> from <2345> leaving <234>

R5C2 - removing <5> from <2345> leaving <234>

R6C2 - removing <5> from <2457> leaving <247>

Intersection of row 7 with block 8. The values <239> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R8C4 - removing <2> from <246> leaving <46>

R8C5 - removing <2> from <1247> leaving <147>

R9C5 - removing <2> from <124> leaving <14>

Squares R9C5 and R9C9 in row 9 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 row.

R9C8 - removing <14> from <124> leaving <2>

Squares R3C4 and R8C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C4 - removing <4> from <45> leaving <5>

R6C4 - removing <4> from <2459> leaving <259>

R4C3 can only be <8>

R6C3 can only be <5>

R6C7 can only be <7>

R4C7 can only be <1>

R4C6 can only be <4>

R5C7 can only be <5>

R4C8 can only be <3>

R3C6 can only be <6>

R6C6 can only be <9>

R4C2 can only be <7>

R6C4 can only be <2>

R7C6 can only be <3>

R2C6 can only be <7>

R3C4 can only be <4>

R8C6 can only be <1>

R6C2 can only be <4>

R7C4 can only be <9>

R5C5 can only be <1>

R7C5 can only be <2>

R2C4 can only be <3>

R8C8 can only be <4>

R9C5 can only be <4>

R8C4 can only be <6>

R8C5 can only be <7>

R5C8 can only be <9>

R6C8 can only be <8>

R9C9 can only be <1>

R2C9 can only be <9>

R2C5 can only be <5>

R1C9 can only be <7>

R5C9 can only be <4>

R1C8 can only be <6>

R1C1 can only be <5>

R2C8 can only be <1>

R2C2 can only be <6>

R1C5 can only be <9>

R8C1 can only be <2>

R2C1 can only be <4>

R9C2 can only be <3>

R8C2 can only be <5>

R5C1 can only be <3>

R9C1 can only be <6>

R5C2 can only be <2>



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