Daily Sudoku Answer 

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R8C1 can only be <1>

R8C3 can only be <3>

R1C2 is the only square in row 1 that can be <4>

R3C2 is the only square in row 3 that can be <1>

R5C3 is the only square in row 5 that can be <1>

R7C4 is the only square in row 7 that can be <3>

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

R9C9 is the only square in row 9 that can be <4>

R5C7 is the only square in row 5 that can be <4>

R4C3 is the only square in row 4 that can be <4>

R8C7 is the only square in block 9 that can be <5>

Squares R6C3 and R6C4 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C2 - removing <9> from <269> leaving <26>

R6C6 - removing <9> from <129> leaving <12>

R6C8 - removing <9> from <1689> leaving <168>

Squares R2C6<589>, R3C4<459>, R3C5<58> and R3C6<4589> in block 2 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <4589>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C5 - removing <5> from <567> leaving <67>

R2C4 - removing <59> from <5679> leaving <67>

Squares R1C1 and R1C5 in row 1 and R5C1 and R5C5 in row 5 form a Simple X-Wing pattern on possibility <7>. All other instances of this possibility in columns 1 and 5 can be removed.

R2C1 - removing <7> from <579> leaving <59>

Squares R5C9 (XY), R4C7 (XZ) and R1C9 (YZ) form an XY-Wing pattern on <6>. All squares that are buddies of both the XZ and YZ squares cannot be <6>.

R2C7 - removing <6> from <268> leaving <28>

Intersection of column 7 with block 6. The value <6> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R4C8 - removing <6> from <169> leaving <19>

R6C8 - removing <6> from <168> leaving <18>

Squares R2C4 and R2C9 in row 2 and R8C4 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 4 and 9 can be removed.

R1C9 - removing <6> from <69> leaving <9>

R5C9 can only be <2>

R5C5 can only be <7>

R4C7 can only be <6>

R6C7 can only be <8>

R5C1 can only be <9>

R1C5 can only be <6>

R6C4 can only be <9>

R6C3 can only be <7>

R4C4 can only be <5>

R6C8 can only be <1>

R2C7 can only be <2>

R6C6 can only be <2>

R4C8 can only be <9>

R1C8 can only be <5>

R2C4 can only be <7>

R1C1 can only be <7>

R3C8 can only be <8>

R2C3 can only be <9>

R3C5 can only be <5>

R9C8 can only be <6>

R2C9 can only be <6>

R3C4 can only be <4>

R4C2 can only be <2>

R2C1 can only be <5>

R9C1 can only be <2>

R6C2 can only be <6>

R4C6 can only be <1>

R9C5 can only be <8>

R7C2 can only be <8>

R9C2 can only be <9>

R7C6 can only be <5>

R8C6 can only be <4>

R8C9 can only be <8>

R2C6 can only be <8>

R8C4 can only be <6>

R3C6 can only be <9>

R7C5 can only be <2>

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