Daily Sudoku Answer 

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R1C4 can only be <1>

R1C6 can only be <5>

R4C5 can only be <1>

R6C1 can only be <1>

R5C4 can only be <3>

R1C5 can only be <2>

R6C5 can only be <5>

R9C4 can only be <9>

R6C9 can only be <4>

R2C5 can only be <8>

R3C8 is the only square in row 3 that can be <5>

R7C7 is the only square in row 7 that can be <3>

R9C5 is the only square in row 9 that can be <3>

Intersection of column 7 with block 3. The values <24> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.

R3C9 - removing <2> from <126> leaving <16>

Squares R7C8<19>, R8C7<69> and R9C7<16> in block 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <169>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C9 - removing <169> from <16789> leaving <78>

R9C9 - removing <16> from <1678> leaving <78>

Intersection of row 7 with block 7. The value <6> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C3 - removing <6> from <679> leaving <79>

R9C1 - removing <6> from <2678> leaving <278>

R9C3 - removing <6> from <12678> leaving <1278>

Intersection of column 9 with block 3. The value <6> only appears in one or more of squares R1C9, R2C9 and R3C9 of column 9. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <6> from <469> leaving <49>

R3C7 - removing <6> from <1246> leaving <124>

Squares R2C3 and R2C7 in row 2 and R8C3 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 3 and 7 can be removed.

R1C3 - removing <9> from <679> leaving <67>

R1C7 - removing <9> from <49> leaving <4>

R7C3 - removing <9> from <16789> leaving <1678>

R3C1 is the only square in row 3 that can be <4>

Squares R1C1 and R1C9 in row 1 and R4C1 and R4C9 in row 4 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 1 and 9 can be removed.

R5C1 - removing <9> from <289> leaving <28>

R5C9 - removing <9> from <129> leaving <12>

R7C1 - removing <9> from <6789> leaving <678>

Squares R3C2 (XY), R2C3 (XZ) and R7C2 (YZ) form an XY-Wing pattern on <9>. All squares that are buddies of both the XZ and YZ squares cannot be <9>.

R8C3 - removing <9> from <79> leaving <7>

R8C5 can only be <6>

R1C3 can only be <6>

R8C7 can only be <9>

R5C5 can only be <7>

R9C6 can only be <7>

R2C7 can only be <2>

R7C8 can only be <1>

R9C9 can only be <8>

R5C6 can only be <6>

R9C1 can only be <2>

R7C9 can only be <7>

R1C9 can only be <9>

R1C1 can only be <7>

R4C9 can only be <2>

R2C3 can only be <9>

R3C7 can only be <1>

R3C9 can only be <6>

R9C7 can only be <6>

R4C1 can only be <9>

R5C9 can only be <1>

R5C8 can only be <9>

R7C3 can only be <8>

R9C3 can only be <1>

R5C1 can only be <8>

R5C2 can only be <2>

R7C1 can only be <6>

R3C2 can only be <8>

R7C2 can only be <9>

R3C3 can only be <2>

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