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Daily Sudoku Answer 



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Aug 04 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C5 can only be <2>

R9C4 can only be <2>

R1C4 can only be <7>

R1C6 can only be <9>

R1C7 is the only square in row 1 that can be <3>

R2C3 is the only square in row 2 that can be <8>

R3C3 is the only square in row 3 that can be <9>

R4C4 is the only square in row 4 that can be <5>

R4C5 is the only square in row 4 that can be <9>

R5C6 is the only square in row 5 that can be <2>

R5C4 is the only square in row 5 that can be <8>

R6C4 can only be <3>

R5C8 is the only square in row 5 that can be <3>

R6C5 is the only square in row 6 that can be <1>

R6C6 is the only square in row 6 that can be <7>

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

R9C3 is the only square in row 9 that can be <3>

R7C3 is the only square in column 3 that can be <1>

Squares R8C3 and R8C5 in row 8 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 row.

R8C2 - removing <46> from <2467> leaving <27>

R8C8 - removing <46> from <2467> leaving <27>

Squares R4C9 and R6C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C9 - removing <4> from <246> leaving <26>

R3C9 - removing <4> from <1245> leaving <125>

R7C9 - removing <4> from <2456> leaving <256>

R9C9 - removing <4> from <1456> leaving <156>

Intersection of row 1 with block 1. The value <4> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R3C1 - removing <4> from <2457> leaving <257>

R3C2 - removing <4> from <2457> leaving <257>

Squares R5C2 and R8C3 form a remote naked pair. <46> can be removed from any square that is common to their groups.

R7C2 - removing <46> from <24567> leaving <257>

R5C2 is the only square in column 2 that can be <4>

R5C5 can only be <6>

R6C1 can only be <8>

R8C5 can only be <4>

R4C6 can only be <4>

R6C9 can only be <4>

R4C1 can only be <6>

R4C9 can only be <8>

R8C3 can only be <6>

R9C6 can only be <6>

R1C3 can only be <4>

R1C1 can only be <2>

R1C9 can only be <6>

R2C8 can only be <7>

R2C7 can only be <5>

R8C8 can only be <2>

R8C2 can only be <7>

R3C8 can only be <4>

R7C9 can only be <5>

R2C2 can only be <6>

R3C7 can only be <1>

R7C8 can only be <6>

R9C9 can only be <1>

R3C2 can only be <5>

R7C2 can only be <2>

R7C1 can only be <4>

R9C7 can only be <4>

R3C9 can only be <2>

R3C1 can only be <7>

R7C7 can only be <7>

R9C1 can only be <5>



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