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 Sudoku Solution Path    R2C7 can only be <7> R5C8 can only be <9> R3C8 can only be <1> R3C9 can only be <3> R7C8 can only be <7> R1C4 is the only square in row 1 that can be <1> R6C7 is the only square in row 6 that can be <8> R7C5 is the only square in row 7 that can be <4> Squares R6C1 and R6C9 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R6C3 - removing <16> from <1367> leaving <37> Squares R4C5 and R6C5 in column 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R3C5 - removing <7> from <2789> leaving <289> Squares R4C5 and R6C5 in block 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R5C4 - removing <3> from <356> leaving <56> Squares R5C4 and R5C6 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R5C3 - removing <6> from <2346> leaving <234>    R5C7 - removing <6> from <236> leaving <23> Squares R7C4<35>, R9C4<357> and R9C6<57> in block 8 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <357>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R7C6 - removing <5> from <259> leaving <29> Squares R2C3 and R2C5 in row 2, R5C3 and R5C7 in row 5 and R8C5 and R8C7 in row 8 form a Swordfish pattern on possibility <2>. All other instances of this possibility in columns 3, 5 and 7 can be removed.    R3C3 - removing <2> from <24568> leaving <4568>    R3C5 - removing <2> from <289> leaving <89>    R4C3 - removing <2> from <12367> leaving <1367>    R4C7 - removing <2> from <1236> leaving <136>    R7C7 - removing <2> from <1256> leaving <156> Squares R3C2<48>, R3C5<89> and R3C7<49> in row 3 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <489>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R3C3 - removing <48> from <4568> leaving <56>    R3C6 - removing <9> from <2679> leaving <267> Squares R6C3, R6C5, R4C3 and R4C5 form a Type-1 Unique Rectangle on <37>.    R4C3 - removing <37> from <1367> leaving <16> R4C5 is the only square in row 4 that can be <7> R6C5 can only be <3> R6C3 can only be <7> R4C7 is the only square in row 4 that can be <3> R5C7 can only be <2> R8C7 can only be <5> R8C3 can only be <9> R9C7 can only be <1> R7C7 can only be <6> R7C9 can only be <2> R7C6 can only be <9> R8C5 can only be <2> R2C5 can only be <8> R2C3 can only be <2> R3C5 can only be <9> R3C7 can only be <4> R1C6 can only be <6> R3C2 can only be <8> R1C7 can only be <9> R1C3 can only be <4> R5C6 can only be <5> R3C4 can only be <7> R7C2 can only be <3> R3C6 can only be <2> R5C4 can only be <6> R9C6 can only be <7> R7C4 can only be <5> R5C2 can only be <4> R9C3 can only be <5> R7C1 can only be <1> R9C4 can only be <3> R3C3 can only be <6> R5C3 can only be <3> R3C1 can only be <5> R4C3 can only be <1> R4C9 can only be <6> R7C3 can only be <8> R6C1 can only be <6> R4C1 can only be <2> R6C9 can only be <1>

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