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Daily Sudoku Answer 



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Aug 18 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s010138



Reasoning 



R7C9 can only be <7>

R7C8 can only be <6>

R8C9 can only be <4>

R9C7 can only be <8>

R3C1 is the only square in row 3 that can be <8>

R1C8 is the only square in row 1 that can be <8>

R1C7 is the only square in row 1 that can be <4>

R1C6 is the only square in row 1 that can be <3>

R3C6 is the only square in row 3 that can be <9>

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

R5C7 is the only square in row 5 that can be <3>

R6C8 can only be <4>

R6C1 can only be <5>

R4C8 can only be <7>

R2C8 can only be <3>

R5C5 is the only square in row 5 that can be <4>

R5C3 is the only square in row 5 that can be <7>

R6C2 is the only square in row 6 that can be <3>

R6C7 is the only square in row 6 that can be <6>

R9C5 is the only square in column 5 that can be <5>

R8C3 is the only square in row 8 that can be <5>

R4C9 is the only square in column 9 that can be <5>

Squares R2C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R9C1 - removing <67> from <4679> leaving <49>

Squares R5C4 and R5C6 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C6 - removing <1> from <128> leaving <28>

R6C4 - removing <1> from <128> leaving <28>

Intersection of row 1 with block 2. The value <7> only appears in one or more of squares R1C4, R1C5 and R1C6 of row 1. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R2C4 - removing <7> from <12567> leaving <1256>

R3C5 - removing <7> from <127> leaving <12>

R1C5 is the only square in column 5 that can be <7>

Squares R5C4, R5C6, R2C4 and R2C6 form a Type-3 Unique Rectangle on <15>. Upon close inspection, it is clear that:

(R2C4 or R2C6)<26> and R1C4<26> form a naked pair on <26> in block 2. No other squares in the block can contain these possibilities

R3C5 - removing <2> from <12> leaving <1>

R7C5 can only be <2>

R9C6 can only be <6>

R8C1 is the only square in row 8 that can be <6>

R2C1 can only be <7>

R3C2 can only be <2>

R3C7 can only be <7>

R1C3 can only be <6>

R1C4 can only be <2>

R6C4 can only be <8>

R2C6 can only be <5>

R2C4 can only be <6>

R5C6 can only be <1>

R5C4 can only be <5>

R8C6 can only be <8>

R6C3 can only be <1>

R4C6 can only be <2>

R4C7 can only be <1>

R4C2 can only be <4>

R2C7 can only be <2>

R6C9 can only be <2>

R7C3 can only be <9>

R2C9 can only be <1>

R7C4 can only be <1>

R4C3 can only be <8>

R9C3 can only be <2>

R9C1 can only be <4>

R8C4 can only be <7>

R8C2 can only be <1>

R9C4 can only be <9>

R9C2 can only be <7>

R4C1 can only be <9>



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