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 Sudoku Solution Path   R5C1 can only be <2> R9C5 can only be <3> R2C7 is the only square in row 2 that can be <3> R3C2 is the only square in row 3 that can be <1> R4C4 is the only square in row 4 that can be <3> R8C2 is the only square in row 8 that can be <3> R5C2 is the only square in column 2 that can be <6> R7C2 is the only square in column 2 that can be <9> R6C4 is the only square in column 4 that can be <2> R7C4 is the only square in column 4 that can be <4> Squares R2C1 and R2C9 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R2C2 - removing <4> from <248> leaving <28>    R2C3 - removing <45> from <24578> leaving <278>    R2C8 - removing <45> from <4567> leaving <67> Squares R4C3 and R6C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R8C3 - removing <4> from <2458> leaving <258> Intersection of row 2 with block 1. The value <8> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.    R3C3 - removing <8> from <578> leaving <57> Intersection of row 4 with block 5. The value <5> only appears in one or more of squares R4C4, R4C5 and R4C6 of row 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.    R5C5 - removing <5> from <1579> leaving <179>    R5C6 - removing <5> from <578> leaving <78> Squares R5C4 and R5C6 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R5C5 - removing <7> from <179> leaving <19> Intersection of column 2 with block 1. The value <2> only appears in one or more of squares R1C2, R2C2 and R3C2 of column 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.    R2C3 - removing <2> from <278> leaving <78> Intersection of column 8 with block 3. The value <6> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.    R3C7 - removing <6> from <679> leaving <79> Squares R1C2 and R1C8 in row 1 and R9C2 and R9C8 in row 9 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 2 and 8 can be removed.    R8C8 - removing <4> from <4789> leaving <789> Squares R5C4, R5C6, R3C4 and R3C6 form a Type-1 Unique Rectangle on <78>.    R3C6 - removing <78> from <678> leaving <6> R6C6 can only be <4> R6C3 can only be <9> R4C6 can only be <5> R7C6 can only be <7> R4C3 can only be <4> R7C8 can only be <1> R5C6 can only be <8> R8C5 can only be <5> R7C7 can only be <2> R8C1 can only be <4> R5C4 can only be <7> R7C3 can only be <5> R8C9 can only be <9> R2C1 can only be <5> R9C2 can only be <8> R8C7 can only be <7> R5C9 can only be <5> R9C8 can only be <4> R2C2 can only be <2> R8C3 can only be <2> R1C8 can only be <7> R1C5 can only be <2> R2C8 can only be <6> R8C8 can only be <8> R3C7 can only be <9> R2C9 can only be <4> R3C3 can only be <7> R2C5 can only be <7> R1C2 can only be <4> R2C3 can only be <8> R3C4 can only be <8> R3C8 can only be <5> R4C7 can only be <6> R5C8 can only be <9> R4C5 can only be <9> R6C7 can only be <1> R5C5 can only be <1> R6C5 can only be <6>

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