Daily Sudoku Answer 

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R5C5 can only be <6>

R5C8 can only be <2>

R6C4 can only be <3>

R6C6 can only be <4>

R5C2 can only be <4>

R4C9 can only be <4>

R6C1 can only be <8>

R6C9 can only be <5>

R4C1 can only be <2>

R7C1 can only be <6>

R9C1 is the only square in row 9 that can be <4>

R8C1 is the only square in column 1 that can be <5>

R8C8 can only be <3>

R2C8 can only be <6>

R3C3 is the only square in row 3 that can be <6>

R1C4 is the only square in row 1 that can be <6>

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

R9C9 is the only square in row 9 that can be <6>

R9C8 is the only square in row 9 that can be <9>

R1C8 can only be <5>

R9C7 is the only square in row 9 that can be <5>

R9C6 is the only square in column 6 that can be <2>

Intersection of row 3 with block 3. The value <7> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. 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 <7> from <178> leaving <18>

R1C9 - removing <7> from <3789> leaving <389>

R2C9 - removing <7> from <378> leaving <38>

Intersection of column 1 with block 1. The values <139> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.

R1C2 - removing <1> from <1278> leaving <278>

R2C2 - removing <1> from <178> leaving <78>

Squares R1C2<278>, R1C3<27>, R1C6<17> and R1C7<18> in row 1 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <1278>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C1 - removing <1> from <139> leaving <39>

R1C9 - removing <8> from <389> leaving <39>

Squares R2C5 and R9C2 form a remote naked pair. <17> can be removed from any square that is common to their groups.

R2C2 - removing <7> from <78> leaving <8>

R2C9 can only be <3>

R2C1 can only be <1>

R1C9 can only be <9>

R1C1 can only be <3>

R3C9 can only be <7>

R2C5 can only be <7>

R3C1 can only be <9>

R8C5 can only be <1>

R1C6 can only be <1>

R3C7 can only be <1>

R8C9 can only be <2>

R9C4 can only be <7>

R8C2 can only be <7>

R7C9 can only be <8>

R9C2 can only be <1>

R4C4 can only be <1>

R1C7 can only be <8>

R4C6 can only be <7>

R7C7 can only be <7>

R7C3 can only be <2>

R1C2 can only be <2>

R1C3 can only be <7>

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