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Daily Sudoku Answer 



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Feb 17 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C8 can only be <3>

R5C5 can only be <5>

R5C8 can only be <2>

R8C5 can only be <9>

R5C2 can only be <8>

R5C9 can only be <6>

R6C8 can only be <1>

R6C7 can only be <5>

R5C1 can only be <7>

R4C2 can only be <5>

R4C7 can only be <8>

R4C3 can only be <9>

R2C7 is the only square in row 2 that can be <6>

R2C6 is the only square in row 2 that can be <9>

R2C4 is the only square in row 2 that can be <4>

R3C7 is the only square in row 3 that can be <1>

R3C9 is the only square in row 3 that can be <2>

R1C5 is the only square in row 1 that can be <2>

R7C3 is the only square in row 7 that can be <6>

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

Intersection of row 1 with block 1. The value <5> 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 <5> from <4589> leaving <489>

R3C3 - removing <5> from <3578> leaving <378>

Intersection of block 3 with row 1. The value <3> only appears in one or more of squares R1C7, R1C8 and R1C9 of block 3. These squares are the ones that intersect with row 1. Thus, the other (non-intersecting) squares of row 1 cannot contain this value.

R1C3 - removing <3> from <35> leaving <5>

Intersection of row 8 with block 8. The value <5> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R7C4 - removing <5> from <578> leaving <78>

R7C6 - removing <5> from <345> leaving <34>

Squares R1C1 and R1C7 in row 1 and R9C1 and R9C7 in row 9 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 1 and 7 can be removed.

R3C1 - removing <4> from <489> leaving <89>

R7C1 - removing <4> from <458> leaving <58>

R7C7 - removing <4> from <2347> leaving <237>

R8C7 - removing <4> from <24> leaving <2>

R8C3 can only be <8>

R8C4 can only be <5>

R7C1 can only be <5>

R8C6 can only be <4>

R3C4 can only be <7>

R7C6 can only be <3>

R3C3 can only be <3>

R7C4 can only be <8>

R2C5 can only be <3>

R9C1 can only be <4>

R7C7 can only be <7>

R7C9 can only be <9>

R3C6 can only be <5>

R9C5 can only be <7>

R7C8 can only be <4>

R1C9 can only be <3>

R9C7 can only be <3>

R1C1 can only be <9>

R7C2 can only be <2>

R9C9 can only be <5>

R1C7 can only be <4>

R3C1 can only be <8>

R3C8 can only be <9>

R2C3 can only be <7>

R3C2 can only be <4>

R6C3 can only be <2>

R6C2 can only be <3>



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