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Sudoku Solution Path

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R1C7 can only be <3>
R1C9 is the only square in row 1 that can be <6>
R4C5 is the only square in row 4 that can be <7>
R5C5 is the only square in row 5 that can be <1>
R5C4 is the only square in row 5 that can be <6>
R5C3 is the only square in column 3 that can be <3>
Intersection of column 3 with block 1. The value <4> only appears in one or more of squares R1C3, R2C3 and R3C3 of column 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R1C1 - removing <4> from <4589> leaving <589>
   R3C1 - removing <4> from <2459> leaving <259>
Intersection of block 6 with row 5. The value <4> only appears in one or more of squares R5C7, R5C8 and R5C9 of block 6. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.
   R5C6 - removing <4> from <2458> leaving <258>
Intersection of block 8 with row 9. The value <2> only appears in one or more of squares R9C4, R9C5 and R9C6 of block 8. These squares are the ones that intersect with row 9. Thus, the other (non-intersecting) squares of row 9 cannot contain this value.
   R9C1 - removing <2> from <1258> leaving <158>
   R9C3 - removing <2> from <25> leaving <5>
   R9C7 - removing <2> from <1248> leaving <148>
   R9C9 - removing <2> from <1238> leaving <138>
Squares R2C2 and R2C8 in row 2 and R8C2 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 2 and 8 can be removed.
   R5C2 - removing <2> from <25> leaving <5>
   R5C8 - removing <2> from <245> leaving <45>
R5C8 can only be <4>
R8C8 can only be <2>
R8C2 can only be <8>
R2C8 can only be <5>
R2C5 can only be <8>
R8C5 can only be <4>
R2C2 can only be <2>
R9C1 can only be <1>
R7C5 can only be <3>
R1C1 is the only square in row 1 that can be <8>
R1C6 is the only square in row 1 that can be <5>
R3C5 can only be <9>
R3C1 can only be <5>
R3C3 can only be <4>
R6C5 can only be <5>
R1C4 can only be <4>
R6C9 can only be <2>
R6C1 can only be <4>
R3C9 can only be <1>
R5C7 can only be <8>
R1C3 can only be <9>
R6C4 can only be <9>
R3C7 can only be <2>
R7C9 can only be <8>
R5C6 can only be <2>
R7C7 can only be <1>
R9C7 can only be <4>
R4C9 can only be <5>
R6C6 can only be <3>
R4C1 can only be <2>
R9C9 can only be <3>
R7C3 can only be <2>
R4C4 can only be <8>
R7C1 can only be <9>
R4C6 can only be <4>
R9C4 can only be <2>
R9C6 can only be <8>


 

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