Daily Sudoku Answer 

The full reasoning can be found below the Sudoku.

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R1C4 is the only square in row 1 that can be <9>

R4C4 can only be <3>

R6C6 can only be <4>

R5C5 can only be <9>

R4C7 is the only square in row 4 that can be <7>

R4C9 is the only square in row 4 that can be <8>

R6C1 is the only square in row 6 that can be <3>

R8C3 is the only square in row 8 that can be <7>

R9C6 is the only square in row 9 that can be <7>

R9C4 is the only square in row 9 that can be <1>

R4C1 is the only square in column 1 that can be <9>

R7C7 is the only square in column 7 that can be <6>

R7C6 can only be <3>

R8C4 is the only square in row 8 that can be <6>

R5C8 is the only square in column 8 that can be <6>

R6C9 is the only square in column 9 that can be <2>

R3C7 is the only square in column 7 that can be <2>

R2C7 is the only square in column 7 that can be <8>

Squares R2C1 and R5C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C1 - removing <5> from <258> leaving <28>

R8C1 - removing <4> from <248> leaving <28>

Intersection of row 9 with block 9. The value <5> 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.

R7C8 - removing <5> from <589> leaving <89>

Squares R7C3<24>, R7C4<45> and R7C5<245> in row 7 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <245>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C2 - removing <24> from <2489> leaving <89>

R4C2 is the only square in column 2 that can be <2>

R4C3 can only be <6>

Squares R3C3<145>, R3C4<45>, R3C5<345> and R3C8<135> in row 3 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <1345>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C2 - removing <14> from <1468> leaving <68>

R3C6 - removing <1> from <168> leaving <68>

Squares R3C3 and R3C8 in row 3 and R6C3 and R6C8 in row 6 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 3 and 8 can be removed.

R1C3 - removing <1> from <125> leaving <25>

R1C8 - removing <1> from <15> leaving <5>

R1C3 can only be <2>

R1C1 can only be <8>

R7C3 can only be <4>

R7C4 can only be <5>

R9C2 can only be <9>

R7C5 can only be <2>

R3C4 can only be <4>

R8C5 can only be <4>

R8C9 can only be <3>

R8C8 can only be <8>

R2C9 can only be <1>

R9C7 can only be <5>

R7C2 can only be <8>

R9C9 can only be <4>

R6C7 can only be <9>

R1C6 can only be <1>

R8C1 can only be <2>

R3C2 can only be <6>

R2C6 can only be <6>

R3C6 can only be <8>

R2C2 can only be <4>

R5C9 can only be <5>

R3C8 can only be <3>

R3C5 can only be <5>

R5C1 can only be <4>

R6C8 can only be <1>

R6C3 can only be <5>

R7C8 can only be <9>

R2C1 can only be <5>

R5C2 can only be <1>

R3C3 can only be <1>

R2C5 can only be <3>

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