Daily Sudoku Answer 

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R4C1 can only be <7>

R4C3 can only be <4>

R4C5 can only be <3>

R5C1 can only be <5>

R4C9 can only be <1>

R6C5 can only be <9>

R4C7 can only be <6>

R5C2 can only be <3>

R6C1 can only be <8>

R6C3 can only be <2>

R7C8 is the only square in row 7 that can be <2>

R9C8 is the only square in row 9 that can be <3>

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

R6C7 can only be <5>

R6C9 can only be <3>

R3C8 is the only square in row 3 that can be <9>

R5C8 can only be <4>

R5C9 can only be <9>

R7C6 is the only square in row 7 that can be <5>

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

R3C6 is the only square in column 6 that can be <8>

R7C4 is the only square in column 4 that can be <8>

R7C3 can only be <9>

R8C7 is the only square in row 8 that can be <9>

Intersection of row 1 with block 2. The value <4> only appears in one or more of squares R1C4, R1C5 and R1C6 of row 1. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R2C5 - removing <4> from <1247> leaving <127>

Intersection of column 4 with block 2. The value <1> only appears in one or more of squares R1C4, R2C4 and R3C4 of column 4. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C5 - removing <1> from <124> leaving <24>

R2C5 - removing <1> from <127> leaving <27>

Squares R2C1<16>, R3C2<17> and R3C3<67> in block 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <167>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C2 - removing <1> from <125> leaving <25>

R2C2 - removing <17> from <12578> leaving <258>

R2C3 - removing <67> from <678> leaving <8>

R2C5 is the only square in row 2 that can be <7>

R2C2 is the only square in row 2 that can be <2>

R1C2 can only be <5>

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

R1C6 is the only square in row 1 that can be <4>

R9C6 can only be <7>

R5C6 can only be <6>

R5C4 can only be <7>

R8C2 is the only square in row 8 that can be <8>

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

R3C3 can only be <6>

R3C4 can only be <1>

R2C1 can only be <1>

R3C2 can only be <7>

R1C4 can only be <6>

R1C8 can only be <1>

R8C8 can only be <5>

R2C7 can only be <4>

R8C1 can only be <6>

R2C9 can only be <5>

R7C7 can only be <1>

R2C8 can only be <6>

R8C9 can only be <4>

R7C2 can only be <4>

R8C5 can only be <1>

R9C2 can only be <1>

R9C5 can only be <4>

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