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Common Answers

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Sudoku Solution Path

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R8C8 can only be <1>
R7C8 can only be <5>
R7C2 can only be <7>
R7C1 can only be <6>
R9C1 can only be <5>
R7C3 can only be <2>
R8C1 can only be <8>
R7C4 can only be <1>
R2C1 is the only square in row 2 that can be <4>
R4C2 is the only square in row 4 that can be <3>
R9C7 is the only square in row 9 that can be <9>
R5C7 can only be <5>
R9C4 is the only square in row 9 that can be <2>
R3C7 is the only square in column 7 that can be <6>
R7C7 is the only square in column 7 that can be <3>
R7C9 can only be <4>
R8C7 can only be <2>
R8C9 can only be <7>
R6C9 is the only square in row 6 that can be <2>
R4C9 is the only square in column 9 that can be <1>
R4C1 can only be <9>
R4C4 can only be <6>
R1C4 can only be <8>
R2C4 can only be <7>
R5C4 can only be <9>
R6C8 is the only square in row 6 that can be <9>
R3C8 can only be <8>
R3C2 can only be <5>
R2C2 can only be <8>
R2C3 can only be <6>
Squares R5C3 and R6C1 in block 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R6C3 - removing <17> from <1578> leaving <58>
Squares R3C6<13>, R5C6<17> and R9C6<37> in column 6 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <137>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C6 - removing <1> from <156> leaving <56>
   R6C6 - removing <17> from <1457> leaving <45>
Squares R4C5 and R6C6 in block 5 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 block.
   R6C5 - removing <45> from <1457> leaving <17>
Squares R3C1 and R5C6 form a remote locked pair. <17> can be removed from any square that is common to their groups.
   R3C6 - removing <1> from <13> leaving <3>
R3C9 can only be <9>
R9C6 can only be <7>
R2C5 can only be <5>
R1C9 can only be <5>
R9C5 can only be <3>
R5C6 can only be <1>
R1C6 can only be <6>
R2C9 can only be <3>
R4C5 can only be <4>
R4C7 can only be <8>
R8C5 can only be <6>
R6C6 can only be <5>
R4C3 can only be <5>
R6C7 can only be <4>
R5C3 can only be <7>
R6C5 can only be <7>
R6C1 can only be <1>
R6C3 can only be <8>
R8C6 can only be <4>
R1C5 can only be <1>
R1C3 can only be <9>
R3C3 can only be <1>
R3C1 can only be <7>


 

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