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Sudoku Solution Path

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R7C8 can only be <2>
R8C8 can only be <6>
R7C7 can only be <5>
R6C8 can only be <9>
R1C8 can only be <1>
R5C8 can only be <7>
R2C8 can only be <8>
R1C3 is the only square in row 1 that can be <7>
R3C9 is the only square in row 3 that can be <3>
R9C9 can only be <9>
R9C7 can only be <3>
R4C5 is the only square in row 4 that can be <7>
R4C7 is the only square in row 4 that can be <6>
R6C7 can only be <2>
R6C9 can only be <4>
R1C7 can only be <9>
R5C9 can only be <5>
R6C5 is the only square in row 6 that can be <6>
R6C6 is the only square in row 6 that can be <3>
R5C2 is the only square in row 5 that can be <3>
R8C5 is the only square in row 8 that can be <3>
Intersection of row 5 with block 5. The value <2> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R4C4 - removing <2> from <1245> leaving <145>
R5C4 is the only square in column 4 that can be <2>
Intersection of column 1 with block 4. The value <9> only appears in one or more of squares R4C1, R5C1 and R6C1 of column 1. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R4C2 - removing <9> from <1249> leaving <124>
Squares R5C1 and R5C5 in row 5 and R7C1 and R7C5 in row 7 form a Simple X-Wing pattern on possibility <8>. All other instances of this possibility in columns 1 and 5 can be removed.
   R9C1 - removing <8> from <1568> leaving <156>
   R9C5 - removing <8> from <158> leaving <15>
Squares R1C1, R1C5 and R1C6 in row 1, R5C1, R5C5 and R5C6 in row 5 and R7C1 and R7C5 in row 7 form a Swordfish pattern on possibility <4>. All other instances of this possibility in columns 1, 5 and 6 can be removed.
   R3C5 - removing <4> from <149> leaving <19>
   R4C1 - removing <4> from <149> leaving <19>
   R4C6 - removing <4> from <1459> leaving <159>
   R8C1 - removing <4> from <145> leaving <15>
Squares R2C6 and R3C5 in block 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C5 - removing <19> from <129> leaving <2>
R2C9 can only be <6>
R1C9 can only be <2>
R1C1 is the only square in row 1 that can be <6>
R9C2 is the only square in row 9 that can be <6>
R9C3 is the only square in row 9 that can be <2>
R4C2 is the only square in row 4 that can be <2>
R9C4 is the only square in row 9 that can be <8>
R6C4 can only be <1>
R7C5 can only be <4>
R6C3 can only be <8>
R7C1 can only be <8>
R1C5 can only be <5>
R8C4 can only be <5>
R8C1 can only be <1>
R4C4 can only be <4>
R9C5 can only be <1>
R9C1 can only be <5>
R3C5 can only be <9>
R1C6 can only be <4>
R5C6 can only be <9>
R5C5 can only be <8>
R2C6 can only be <1>
R4C3 can only be <1>
R5C1 can only be <4>
R4C6 can only be <5>
R8C2 can only be <4>
R4C1 can only be <9>
R3C2 can only be <1>
R2C2 can only be <9>
R3C3 can only be <4>


 

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