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Daily Sudoku Answer 



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Feb 18 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C7 can only be <5>

R7C8 can only be <2>

R8C7 can only be <6>

R7C3 can only be <9>

R8C8 can only be <1>

R2C7 can only be <8>

R3C7 can only be <3>

R9C9 can only be <8>

R4C9 can only be <5>

R5C9 can only be <6>

R5C8 can only be <7>

R1C9 can only be <2>

R6C9 can only be <3>

R6C8 can only be <9>

R7C2 can only be <3>

R3C3 can only be <6>

R3C2 can only be <9>

R3C8 can only be <4>

R2C8 can only be <6>

R4C8 can only be <8>

R1C1 can only be <1>

R4C1 is the only square in row 4 that can be <9>

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

Squares R2C6 and R4C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C6 - removing <4> from <245> leaving <25>

R8C6 - removing <4> from <2345> leaving <235>

R9C6 - removing <4> from <2456> leaving <256>

Intersection of row 5 with block 4. The value <5> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R6C1 - removing <5> from <245> leaving <24>

Squares R2C5<14>, R5C5<12> and R9C5<24> in column 5 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <124>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R8C5 - removing <24> from <2349> leaving <39>

Squares R1C4<69>, R6C4<45>, R8C4<459> and R9C4<456> in column 4 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <4569>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C4 - removing <4> from <147> leaving <17>

R4C4 - removing <4> from <147> leaving <17>

Squares R2C2, R2C3, R8C2 and R8C3 form a Type-1 Unique Rectangle on <25>.

R8C2 - removing <25> from <245> leaving <4>

R4C2 can only be <1>

R4C4 can only be <7>

R4C6 can only be <4>

R2C4 can only be <1>

R2C6 can only be <7>

R6C4 can only be <5>

R6C6 can only be <2>

R8C4 can only be <9>

R6C1 can only be <4>

R5C5 can only be <1>

R8C5 can only be <3>

R1C4 can only be <6>

R8C6 can only be <5>

R1C5 can only be <9>

R8C3 can only be <2>

R9C6 can only be <6>

R9C4 can only be <4>

R1C6 can only be <3>

R2C5 can only be <4>

R9C5 can only be <2>

R2C3 can only be <5>

R9C1 can only be <5>

R5C1 can only be <2>

R2C2 can only be <2>

R5C2 can only be <5>



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