Daily Sudoku Answer 

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R4C2 can only be <4>

R5C7 can only be <6>

R6C4 can only be <2>

R8C6 can only be <3>

R5C2 can only be <8>

R5C3 can only be <2>

R6C2 can only be <3>

R5C5 can only be <4>

R8C5 can only be <1>

R5C8 can only be <9>

R4C8 can only be <2>

R6C6 can only be <8>

R6C8 can only be <1>

R4C4 can only be <5>

R4C6 can only be <6>

R7C5 can only be <2>

R8C4 can only be <4>

R2C6 can only be <2>

R2C4 can only be <3>

R8C1 can only be <8>

R1C9 is the only square in row 1 that can be <2>

R1C2 is the only square in row 1 that can be <9>

R7C7 is the only square in row 7 that can be <8>

R9C1 is the only square in row 9 that can be <2>

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

R1C3 can only be <5>

R1C8 can only be <7>

R8C9 is the only square in row 8 that can be <7>

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

R9C8 is the only square in row 9 that can be <4>

Squares R3C3 and R3C9 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C1 - removing <4> from <347> leaving <37>

Squares R3C3 and R3C9 in row 3 and R7C3 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 3 and 9 can be removed.

R2C9 - removing <6> from <146> leaving <14>

The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:

R2C1=<47>

These are called the BUG possibilities. In a BUG pattern, in each row, column and block, each unsolved possibility appears exactly twice. Such a pattern either has 0 or 2 solutions, so it cannot be part of a valid Sudoku

When a puzzle contains a BUG, and only one square in the puzzle has more than 2 possibilities, the only way to kill the BUG is to remove both of the BUG possibilities from the square, thus solving it

R2C1 - removing <47> from <147> leaving <1>

R2C2 can only be <6>

R2C9 can only be <4>

R1C1 can only be <3>

R7C1 can only be <4>

R2C8 can only be <5>

R8C2 can only be <5>

R3C3 can only be <4>

R2C5 can only be <7>

R8C8 can only be <6>

R3C7 can only be <3>

R3C9 can only be <6>

R7C3 can only be <6>

R3C1 can only be <7>

R1C7 can only be <1>

R7C9 can only be <1>

R9C7 can only be <5>

R9C2 can only be <1>

R3C5 can only be <5>

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