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Sudoku Solution Path

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R2C2 is the only square in row 2 that can be <4>
R3C1 is the only square in row 3 that can be <5>
R5C5 is the only square in row 5 that can be <7>
R6C6 is the only square in row 6 that can be <4>
R7C1 is the only square in row 7 that can be <4>
R7C9 is the only square in row 7 that can be <7>
R9C5 is the only square in row 9 that can be <3>
R9C7 is the only square in row 9 that can be <4>
R9C3 is the only square in row 9 that can be <7>
R3C2 is the only square in column 2 that can be <3>
Intersection of row 6 with block 5. The value <6> only appears in one or more of squares R6C4, R6C5 and R6C6 of row 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R5C4 - removing <6> from <2368> leaving <238>
Intersection of block 2 with row 3. The value <2> only appears in one or more of squares R3C4, R3C5 and R3C6 of block 2. These squares are the ones that intersect with row 3. Thus, the other (non-intersecting) squares of row 3 cannot contain this value.
   R3C8 - removing <2> from <289> leaving <89>
   R3C9 - removing <2> from <128> leaving <18>
Intersection of block 6 with row 5. The value <8> 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.
   R5C2 - removing <8> from <689> leaving <69>
   R5C4 - removing <8> from <238> leaving <23>
R8C2 is the only square in column 2 that can be <8>
Squares R5C1 and R5C2 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R5C6 - removing <9> from <259> leaving <25>
Squares R5C1 and R5C2 in block 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R4C3 - removing <9> from <589> leaving <58>
Squares R5C6 and R5C8 in row 5 and R7C6 and R7C8 in row 7 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 6 and 8 can be removed.
   R4C6 - removing <5> from <159> leaving <19>
   R8C8 - removing <5> from <259> leaving <29>
Squares R8C3 and R8C8 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C7 - removing <29> from <2569> leaving <56>
Intersection of column 7 with block 3. The value <9> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R2C8 - removing <9> from <239> leaving <23>
   R3C8 - removing <9> from <89> leaving <8>
R3C9 can only be <1>
R3C4 can only be <2>
R3C6 can only be <9>
R5C4 can only be <3>
R4C6 can only be <1>
R2C5 can only be <1>
R7C6 can only be <5>
R4C4 can only be <8>
R7C8 can only be <9>
R5C6 can only be <2>
R8C5 can only be <6>
R7C2 can only be <6>
R8C8 can only be <2>
R8C7 can only be <5>
R7C4 can only be <1>
R4C7 can only be <3>
R6C7 can only be <2>
R8C3 can only be <9>
R2C8 can only be <3>
R5C8 can only be <5>
R9C9 can only be <6>
R9C1 can only be <2>
R1C9 can only be <2>
R1C1 can only be <9>
R5C9 can only be <8>
R1C5 can only be <8>
R2C7 can only be <9>
R4C3 can only be <5>
R6C4 can only be <6>
R6C5 can only be <5>
R6C3 can only be <8>
R4C5 can only be <9>
R5C2 can only be <9>
R1C3 can only be <1>
R2C3 can only be <2>
R1C7 can only be <6>
R5C1 can only be <6>


 

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