Daily Sudoku Answer 

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R3C7 is the only square in row 3 that can be <5>

R4C5 is the only square in row 4 that can be <2>

R7C6 is the only square in row 7 that can be <9>

R6C6 can only be <7>

Squares R4C4 and R4C6 in row 4 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 row.

R4C7 - removing <6> from <679> leaving <79>

R5C8 is the only square in block 6 that can be <6>

R5C6 can only be <4>

Squares R6C5 and R6C7 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C3 - removing <9> from <159> leaving <15>

Intersection of column 5 with block 8. The value <6> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R7C4 - removing <6> from <367> leaving <37>

Squares R3C1<78>, R3C4<367>, R3C6<36> and R3C9<378> in row 3 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <3678>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C2 - removing <37> from <2379> leaving <29>

R3C3 - removing <78> from <24789> leaving <249>

R3C8 - removing <78> from <2478> leaving <24>

R2C2 is the only square in column 2 that can be <3>

Squares R1C5 and R1C7 in row 1 and R8C5 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 5 and 7 can be removed.

R7C7 - removing <3> from <134678> leaving <14678>

Squares R1C3, R1C5 and R1C7 in row 1, R4C3 and R4C7 in row 4 and R9C3, R9C5 and R9C7 in row 9 form a Swordfish pattern on possibility <7>. All other instances of this possibility in columns 3, 5 and 7 can be removed.

R2C3 - removing <7> from <2478> leaving <248>

R2C5 - removing <7> from <47> leaving <4>

R2C7 - removing <7> from <478> leaving <48>

R7C3 - removing <7> from <12678> leaving <1268>

R7C7 - removing <7> from <14678> leaving <1468>

R8C3 - removing <7> from <5678> leaving <568>

R8C5 - removing <7> from <367> leaving <36>

R8C7 - removing <7> from <3678> leaving <368>

R2C7 can only be <8>

R2C3 can only be <2>

R6C7 can only be <9>

R6C5 can only be <8>

R4C7 can only be <7>

R2C8 can only be <7>

R3C2 can only be <9>

R8C8 can only be <8>

R3C9 can only be <3>

R3C3 can only be <4>

R3C8 can only be <2>

R1C3 can only be <7>

R3C6 can only be <6>

R1C7 can only be <4>

R4C3 can only be <9>

R5C9 can only be <8>

R5C5 can only be <9>

R7C9 can only be <7>

R7C2 can only be <2>

R7C4 can only be <3>

R7C8 can only be <4>

R1C5 can only be <3>

R3C1 can only be <8>

R8C5 can only be <6>

R7C1 can only be <1>

R3C4 can only be <7>

R4C6 can only be <3>

R4C4 can only be <6>

R7C7 can only be <6>

R5C1 can only be <7>

R9C3 can only be <6>

R7C3 can only be <8>

R8C7 can only be <3>

R9C7 can only be <1>

R8C3 can only be <5>

R9C5 can only be <7>

R5C2 can only be <5>

R5C4 can only be <1>

R8C2 can only be <7>

R6C3 can only be <1>

R6C4 can only be <5>

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