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Common Answers

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Sudoku Solution Path

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R3C6 is the only square in row 3 that can be <6>
R3C5 is the only square in row 3 that can be <7>
R2C8 is the only square in row 2 that can be <7>
R5C3 is the only square in row 5 that can be <7>
R8C7 is the only square in row 8 that can be <6>
R5C8 is the only square in row 5 that can be <6>
R4C4 is the only square in row 4 that can be <6>
R6C3 is the only square in row 6 that can be <6>
R1C2 is the only square in column 2 that can be <8>
R1C4 is the only square in row 1 that can be <4>
R1C3 is the only square in row 1 that can be <5>
R2C9 is the only square in row 2 that can be <4>
R2C3 is the only square in row 2 that can be <2>
R3C1 can only be <9>
R3C2 can only be <4>
R8C5 is the only square in row 8 that can be <4>
R7C8 is the only square in row 7 that can be <4>
R7C1 is the only square in column 1 that can be <2>
R5C2 is the only square in column 2 that can be <9>
R2C4 is the only square in column 4 that can be <8>
R1C7 is the only square in column 7 that can be <9>
R1C6 can only be <1>
Squares R7C3 and R7C4 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R7C5 - removing <19> from <1359> leaving <35>
   R7C9 - removing <1> from <135> leaving <35>
Squares R7C3 and R9C3 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R8C1 - removing <1> from <135> leaving <35>
R8C4 is the only square in row 8 that can be <1>
R7C4 can only be <9>
R7C3 can only be <1>
R9C4 can only be <2>
R6C4 can only be <7>
R9C3 can only be <9>
R8C6 is the only square in row 8 that can be <7>
R6C6 is the only square in column 6 that can be <2>
Squares R4C6 and R9C6 in column 6 and R4C8 and R9C8 in column 8 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in rows 4 and 9 can be removed.
   R4C1 - removing <5> from <135> leaving <13>
   R4C5 - removing <5> from <1589> leaving <189>
Squares R3C7, R3C9, R5C7 and R5C9 form a Type-4 Unique Rectangle on <12>.
   R5C7 - removing <1> from <128> leaving <28>
   R5C9 - removing <1> from <125> leaving <25>
Squares R4C1 (XY), R4C8 (XZ) and R6C2 (YZ) form an XY-Wing pattern on <5>. All squares that are buddies of both the XZ and YZ squares cannot be <5>.
   R6C9 - removing <5> from <135> leaving <13>
Squares R5C9 (XY), R3C9 (XZ) and R4C8 (YZ) form an XY-Wing pattern on <1>. All squares that are buddies of both the XZ and YZ squares cannot be <1>.
   R6C9 - removing <1> from <13> leaving <3>
R6C2 can only be <5>
R7C9 can only be <5>
R7C5 can only be <3>
R5C9 can only be <2>
R9C8 can only be <1>
R9C7 can only be <3>
R4C8 can only be <5>
R4C6 can only be <9>
R5C7 can only be <8>
R3C9 can only be <1>
R6C5 can only be <1>
R8C2 can only be <3>
R5C1 can only be <1>
R2C5 can only be <9>
R9C6 can only be <5>
R8C1 can only be <5>
R2C6 can only be <3>
R4C5 can only be <8>
R3C7 can only be <2>
R4C7 can only be <1>
R5C5 can only be <5>
R4C1 can only be <3>


 

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