Daily Sudoku Answer 

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R4C6 can only be <6>

R4C4 can only be <3>

R4C8 can only be <4>

R4C2 can only be <5>

R1C8 is the only square in row 1 that can be <1>

R6C2 is the only square in row 6 that can be <4>

R6C4 is the only square in row 6 that can be <2>

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

R5C2 is the only square in row 5 that can be <2>

R8C5 is the only square in row 8 that can be <5>

R9C1 is the only square in row 9 that can be <1>

R5C1 can only be <8>

R5C3 can only be <1>

R7C7 is the only square in row 7 that can be <1>

R8C6 is the only square in row 8 that can be <1>

Squares R2C3 and R2C7 in row 2 and R8C3 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <8>. All other instances of this possibility in columns 3 and 7 can be removed.

R3C3 - removing <8> from <678> leaving <67>

R3C7 - removing <8> from <368> leaving <36>

R7C3 - removing <8> from <468> leaving <46>

Squares R3C7 and R5C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C7 - removing <36> from <3468> leaving <48>

R8C7 - removing <36> from <3468> leaving <48>

Squares R2C1 and R2C9 in row 2 and R8C1 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 1 and 9 can be removed.

R1C1 - removing <3> from <349> leaving <49>

R1C9 - removing <3> from <3469> leaving <469>

R5C9 - removing <3> from <3679> leaving <679>

R9C9 - removing <3> from <3467> leaving <467>

Squares R7C8 (XY), R7C3 (XZ) and R8C7 (YZ) form an XY-Wing pattern on <4>. All squares that are buddies of both the XZ and YZ squares cannot be <4>.

R8C1 - removing <4> from <349> leaving <39>

R8C3 - removing <4> from <468> leaving <68>

R7C3 is the only square in block 7 that can be <4>

R9C5 is the only square in column 5 that can be <4>

Squares R8C1 (XY), R9C2 (XZ) and R8C4 (YZ) form an XY-Wing pattern on <6>. All squares that are buddies of both the XZ and YZ squares cannot be <6>.

R8C3 - removing <6> from <68> leaving <8>

R8C7 can only be <4>

R2C7 can only be <8>

R3C2 is the only square in row 3 that can be <8>

R7C8 is the only square in row 7 that can be <8>

Squares R2C3 and R3C3 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C2 - removing <6> from <369> leaving <39>

Squares R2C3<67>, R2C4<69> and R2C6<79> in row 2 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <679>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <9> from <349> leaving <34>

R2C9 - removing <69> from <3469> leaving <34>

Intersection of row 2 with block 2. The value <9> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. 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 <9> from <369> leaving <36>

R3C5 - removing <9> from <3679> leaving <367>

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

R6C8 can only be <7>

R6C6 can only be <9>

R2C6 can only be <7>

R5C5 can only be <7>

R2C3 can only be <6>

R2C4 can only be <9>

R3C3 can only be <7>

R8C4 can only be <6>

R8C9 can only be <3>

R7C5 can only be <9>

R8C1 can only be <9>

R2C9 can only be <4>

R9C8 can only be <6>

R9C2 can only be <3>

R9C9 can only be <7>

R5C8 can only be <3>

R2C1 can only be <3>

R1C9 can only be <6>

R5C7 can only be <6>

R7C2 can only be <6>

R1C1 can only be <4>

R1C2 can only be <9>

R1C5 can only be <3>

R5C9 can only be <9>

R3C7 can only be <3>

R3C5 can only be <6>

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