Daily Sudoku Answer 

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R9C4 can only be <4>

R9C6 can only be <9>

R6C6 can only be <4>

R8C5 can only be <3>

R7C5 can only be <8>

R1C7 is the only square in row 1 that can be <3>

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

R4C4 can only be <5>

R4C1 can only be <9>

R6C4 can only be <7>

R5C4 can only be <8>

R6C1 can only be <5>

R5C6 can only be <3>

R4C6 can only be <6>

R6C9 can only be <1>

R6C5 can only be <9>

R3C9 can only be <2>

R4C9 can only be <3>

R5C8 can only be <4>

R7C9 can only be <5>

R4C5 can only be <1>

R1C6 can only be <8>

R5C7 can only be <5>

R1C3 can only be <6>

R5C5 can only be <2>

R8C8 is the only square in row 8 that can be <7>

Squares R2C2 and R8C2 in column 2 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.

R3C2 - removing <4> from <347> leaving <37>

R7C2 - removing <4> from <134> leaving <13>

Squares R9C3, R9C7, R7C3 and R7C7 form a Type-4 Unique Rectangle on <12>.

R7C3 - removing <1> from <129> leaving <29>

R7C7 - removing <1> from <1249> leaving <249>

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

R7C7=<24>

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

R7C7 - removing <24> from <249> leaving <9>

R7C3 can only be <2>

R7C8 can only be <1>

R2C7 can only be <8>

R8C7 can only be <4>

R7C2 can only be <3>

R3C8 can only be <6>

R9C7 can only be <2>

R8C2 can only be <5>

R9C3 can only be <1>

R2C3 can only be <5>

R3C7 can only be <1>

R3C5 can only be <4>

R2C8 can only be <9>

R7C1 can only be <4>

R3C2 can only be <7>

R8C3 can only be <9>

R2C2 can only be <4>

R5C3 can only be <7>

R2C5 can only be <6>

R3C1 can only be <3>

R3C3 can only be <8>

R5C2 can only be <1>

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