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Sudoku Solution Path

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R9C2 can only be <8>
R3C7 is the only square in row 3 that can be <1>
R4C9 is the only square in row 4 that can be <5>
R4C6 is the only square in row 4 that can be <7>
R4C2 is the only square in row 4 that can be <2>
R5C9 is the only square in row 5 that can be <4>
R6C1 is the only square in row 6 that can be <6>
R6C4 is the only square in row 6 that can be <8>
R5C5 can only be <2>
R9C5 can only be <9>
R9C3 can only be <4>
R9C1 can only be <1>
R5C1 is the only square in row 5 that can be <8>
R3C1 is the only square in column 1 that can be <4>
R2C3 is the only square in column 3 that can be <8>
Squares R9C4 and R9C6 in block 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C4 - removing <5> from <1457> leaving <147>
   R7C6 - removing <5> from <14568> leaving <1468>
   R8C4 - removing <2> from <1247> leaving <147>
   R8C6 - removing <2> from <1246> leaving <146>
Intersection of block 1 with row 3. The value <6> only appears in one or more of squares R3C1, R3C2 and R3C3 of block 1. These squares are the ones that intersect with row 3. Thus, the other (non-intersecting) squares of row 3 cannot contain this value.
   R3C5 - removing <6> from <67> leaving <7>
   R3C6 - removing <6> from <2356> leaving <235>
R2C1 is the only square in block 1 that can be <7>
R8C1 can only be <9>
R4C1 can only be <3>
R4C3 can only be <9>
Squares R3C2 and R3C3 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C4 - removing <3> from <2359> leaving <259>
   R3C6 - removing <3> from <235> leaving <25>
   R3C8 - removing <3> from <2359> leaving <259>
Squares R3C6 and R9C6 in column 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C6 - removing <25> from <2356> leaving <36>
Squares R3C2, R3C3, R7C2 and R7C3 form a Type-1 Unique Rectangle on <36>.
   R7C3 - removing <36> from <367> leaving <7>
R8C3 can only be <6>
R3C3 can only be <3>
R7C2 can only be <3>
R3C2 can only be <6>
R8C4 is the only square in row 8 that can be <7>
Squares R7C4 and R8C6 in block 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C6 - removing <14> from <1468> leaving <68>
Squares R7C5, R7C6, R1C5 and R1C6 form a Type-1 Unique Rectangle on <68>.
   R1C6 - removing <68> from <3468> leaving <34>
R1C5 is the only square in row 1 that can be <8>
R7C5 can only be <6>
R7C6 can only be <8>
R1C7 is the only square in row 1 that can be <6>
R1C9 is the only square in row 1 that can be <7>
R2C6 is the only square in row 2 that can be <6>
R6C7 is the only square in row 6 that can be <7>
R7C9 is the only square in column 9 that can be <9>
R7C8 can only be <5>
R7C7 can only be <4>
R7C4 can only be <1>
R8C7 can only be <2>
R8C9 can only be <1>
R2C7 can only be <5>
R8C6 can only be <4>
R5C4 can only be <3>
R1C6 can only be <3>
R1C8 can only be <9>
R5C6 can only be <1>
R2C4 can only be <2>
R1C4 can only be <4>
R3C8 can only be <2>
R2C9 can only be <3>
R9C4 can only be <5>
R3C6 can only be <5>
R6C9 can only be <2>
R3C4 can only be <9>
R9C6 can only be <2>
R6C8 can only be <3>


 

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