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Common Answers

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Sudoku Solution Path

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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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