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Daily Sudoku Answer 



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Jul 13 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s044127



Reasoning 



R3C1 is the only square in row 3 that can be <5>

R8C5 is the only square in row 8 that can be <5>

R8C7 is the only square in row 8 that can be <7>

R4C7 can only be <2>

R8C4 is the only square in row 8 that can be <3>

R2C5 is the only square in row 2 that can be <3>

Squares R5C4 and R5C6 in row 5 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.

R5C1 - removing <4> from <2349> leaving <239>

R5C2 - removing <4> from <3479> leaving <379>

R5C3 - removing <4> from <24569> leaving <2569>

R5C5 - removing <14> from <12468> leaving <268>

Squares R5C4 and R5C6 in block 5 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 block.

R4C5 - removing <4> from <46> leaving <6>

Intersection of block 8 with column 5. The value <1> only appears in one or more of squares R7C5, R8C5 and R9C5 of block 8. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain this value.

R1C5 - removing <1> from <1479> leaving <479>

R3C5 - removing <1> from <1479> leaving <479>

R3C2 is the only square in row 3 that can be <1>

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

R7C5 is the only square in row 7 that can be <1>

R9C3 is the only square in row 9 that can be <1>

R9C1 is the only square in row 9 that can be <2>

Squares R5C1 and R6C2 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R5C2 - removing <39> from <379> leaving <7>

R5C3 - removing <9> from <2569> leaving <256>

R6C3 - removing <9> from <269> leaving <26>

R4C2 can only be <4>

R4C3 can only be <5>

R4C8 can only be <7>

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

Intersection of row 9 with block 9. The value <3> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C9 - removing <3> from <369> leaving <69>

Squares R5C4, R5C6, R2C4 and R2C6 form a Type-1 Unique Rectangle on <14>.

R2C6 - removing <14> from <149> leaving <9>

R8C6 can only be <4>

R8C3 can only be <9>

R5C6 can only be <1>

R9C5 can only be <9>

R9C9 can only be <3>

R9C7 can only be <4>

R5C4 can only be <4>

R7C2 can only be <3>

R2C7 can only be <8>

R2C3 can only be <4>

R2C4 can only be <1>

R7C1 can only be <4>

R6C2 can only be <9>

R1C3 can only be <8>

R1C1 can only be <9>

R6C7 can only be <3>

R6C8 can only be <6>

R5C1 can only be <3>

R5C7 can only be <9>

R6C3 can only be <2>

R7C8 can only be <9>

R7C9 can only be <6>

R3C8 can only be <4>

R1C9 can only be <7>

R1C5 can only be <4>

R3C9 can only be <9>

R3C5 can only be <7>

R5C9 can only be <8>

R5C5 can only be <2>

R6C5 can only be <8>

R5C3 can only be <6>



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